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Index numberCityStateRiverJam dateWater yearJam typeLatitudeLongitudeGage numberAhps idCurrent conditionDamagesDescription
20220309020311Sugar HillNHGale River03/08/20222022Break-up44.24719054-71.77291123--releasedRoad innundatedSUGAR HILL, N.H. — An ice jam in Gale River caused flooding on Tuesday. Sugar Hill Fire Department said the water was diverting around the bridge down Streeter Pond Road, which is a heavily traveled road. The fire department said the detour is 20 miles and a portion of the town is isolated from town services. Officials said they are hopeful they can open the road on Wednesday morning after the highway crew clears debris off the road. https://www.wmur.com/article/video-gale-river-ice-jam-detours-traffic-sugar-hill-new-hampshire-3-8-22/39376418#
20200114213124StratfordNHConnecticut River01/12/20202020Freeze-up44.651797-71.56253--released--
20190409130304FranconiaNHGale River03/31/20192019Break-up----Not Flooding-An ice jam formed 31 Mar 2019 on the Gale River at Franconia, in the same location that it formed in 2016. This is at the cobble bar and accumulation adjacent to Plantation Road, upstream of the Interstate 93 bridge crossing. Chief Taylor reported that the jam extended about 200 yards upstream from the jam toe at the cobble accumulation. Apparently, a resident reported that they were by the river around 9 AM under sunny skies. After becoming cloudy, by 11 AM, the ice jam had formed and had backed up in the upstream direction. Since yesterday, flows have gone down, and the threat is not what it was in 2016. The only concern the Chief expressed was if precipitation chances this week could exacerbate the situation.
20190212202039New BostonNHSouth Branch Piscataquog River02/06/20192019Break-up43.001371-71.662213--Not Flooding--
20190130125043PeterboroughNHContoocook River01/24/20192019Break-up42.86667222-71.94955556--Not Flooding--
20180227170804LancasterNHIsrael River02/23/20182018Break-up44.48791173-71.5692105116296500DLTN3Released--
20180116214941New BostonNHSouth Branch Piscataquog River01/14/20182018Break-up42.98183427-71.6807255401081000GFFN3Released--
20170303140917PlymouthNHPemigewasset River02/26/20172017Break-up43.7563475-71.6848244101076500PLMN3releasedApproximately 50 cars flooded in PSU Ice Arena parking lot.A breakup ice jam occurred on the Pemigewasset River at Plymouth, NH, early in the morning on 26 Feb 2017. The USGS streamgage (01076500) recorded a peak stage of 15.01 feet before the ice jam released at approximately 0600 on 26 Feb 2017. Minor flooding occurred in Plymouth with approximately 50 cars flooded in the parking lot at the Plymouth State University Ice Arena.
20160223154742FranconiaNHGale River02/16/20162016Break-up44.218463-71.727123--released-Hi, Below is a recap of my observations from visiting various ice jams along the Gale and Ammonoosuc Rivers: - Gale River in Franconia (see attached sketch and photos) In Franconia, on the Gale River just upstream of a Route I-93 bridge that spans the river, Plantation Road and Route 18, an ice jam impounded enough water so the river flooded Plantation Road and one residence enough to force evacuation. Local officials said they’ve seen river flows rise enough to exceed the banks along Plantation Road in this area before, and the FEMA flood maps show this area as within the 100 year flood plain. However, they have not seen an ice jam in this area of the river before. No one from DOT was on-site. The water that was diverted onto Plantation Road was not considered a significant threat to the I-93 bridge by DOT, so the Town of Franconia was responding to the flooding. Upon arriving at the site I meet with Mark Taylor, the Franconia Emergency Management Director and Paul Hatch of HSEM. Mark explained the following series of events prior to my arrival on site: At approximately 9:00pm on Tuesday 2/16/2016 water was observed flowing over Plantation Road. The occupants at 155 Plantation Road were evacuated shortly thereafter. The house at 155 Planation Road had been inundated by approximately 3 feet of water at this point. During a site visit on the early morning of Wednesday 2/17/2016 Town of Franconia personnel observed that the depth of floodwaters had increased and water was starting to flow down Plantation Road and alongside the Route 93 bridge pier that separates Plantation Road from the Gale River. At this point a decision was made by the Town of Franconia to try and alleviate the water flowing down Plantation Road by breaching a small berm that separates the Gale River from Plantation Road. The berm appears to be approximately 0.5 feet tall upstream of the Route 93 North bridge pier and approximately 5 feet tall on the upstream end as viewed from Plantation Road. The total length of the berm is approximately 750 feet. It is unclear if this berm is man-made or natural. The berm does not appear to be a jurisdictional dam according to RSA 482:2 due to approximated height of the berm being less than 6 feet and that the berm does not appear to have the ability to impound water within the Gale River channel, as evident from the flooding. It appeared that the upstream end of the berm abruptly ends and does not tie into corresponding elevations. It was at this upstream end where the river exceeded its channel capacity and started to flow along Plantation Road. However, due to the location of the berm, once the water flooded plantation road there was no point at which the water could re-enter the river until it was downstream of Route 93. To alleviate the flooding on Plantation Road, the Town of Franconia breached the berm in two locations using a local excavation contractor. One breach was approximately 200 feet upstream of the Route 93 North bridge pier and was at a location where the berm was 1 to 2 feet in height. The width of the breach was approximately 6 to 8 feet. This first breach routed the water that was potentially threatening the Route 93 bridge pier back into the river. The second breach was approximately 500 feet upstream of the Route 93 North bridge pier and was completed in a location where the berm was 2 to 3 feet in height. The second breach was also approximately 6 to 8 feet in width. Upon my arrival on site the two breaches in the berm were established and appeared to be lowering the flood water level along Plantation Road. I did not observe water flowing around the Route 93 bridge pier and the first breach was alleviating a significant amount of the water that was inundating the house at 155 Plantation Road and Plantation Road. The flood water level around the house at 155 Plantation Road appeared to be 2 to 3 feet lower in elevation than its maximum level (maximum inundation level at the house appeared to be approximately 5 to 6 feet). The second breach appeared to be controlling water from the Gale River that was overtopping the channel and routing that water back into the main river channel. Overall, the level of floodwater was receding and the amount of water overtopping the river channel and flooding Plantation road had greatly reduced upon my arrival. It was discussed prior to my departure that the Town of Franconia would stabilize and maintain the breaches in the berm to help alleviate floodwaters should the Gale River once again overtop its channel upstream of the berm. It was also discussed that the swale between the berm and Plantation road be cleaned and maintained so future water, with the possibility of flooding along Plantation Road, will be controlled by the swale and will find its way out in one of the two breaches in the berm. The Town of Franconia intends on monitoring the ice jam throughout the remainder of the winter. I informed Mark that the Town of Franconia would need to contact the DES Wetlands Bureau as soon as possible to discuss the activities associated with breaching the berm along the river. The latitude and longitude for the downstream end of the ice dam is approximately 44.218463, -71.727123 and the upstream end is approximately 44.219028, -71.723945. Corey J. Clark, P.E. Dam Safety Engineer NH Department of Environmental Services Dam Bureau 29 Hazen Drive, PO Box 95 Concord, NH 03302-0095 Tel: (603) 271-7507 Fax: (603) 271-6120 corey.clark@des.nh.gov <mailto:corey.clark@des.nh.gov>
20140121184710CornishNHConnecticut01/16/20142014Break-up43.47378888-72.38383055--released-Residents along the Connecticut River in Cornish NH and Windsor VT were keeping a close watch on the breakup ice jam and its proximity to the Cornish-Windsor Covered Bridge, according to a vnews.com article 17 Jan 2014. The jam had caused the river level to reach a higher level than it had in years. Cornish Police Chief Doug Hackett said the river’s ice on Sunday reached within a few feet of the underbelly of the bridge. Emergency officials said they monitored the situation closely on Sunday, when ice from the river crept up to the fog line (the road’s outer white line) on Route 12A. The ice has since receded. Farmland on the Vermont side of the river has been flooded, but Windsor Town Manager Tom Marsh said risks to infrastructure are less of a concern there because the banks are higher than on the New Hampshire side and there is more space between the river and the roadway. Representatives of TransCanada, the pipeline company which operates dams along the river, were able to determine that the rate of the water flowing at Wilder Dam VT upstream and Bellows Falls VT downstream was an indication that the water was able to flow smoothly beneath the jam, not posing an immediate risk of flooding.
20140115152127West ClaremontNHSugar River01/13/20142014Break-up43.3875-72.3625-WCLN3released-RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 758 PM EST MON JAN 13 2014 ...FLOOD WARNING EXTENDED UNTIL LATE TONIGHT... THE FLOOD WARNING CONTINUES FOR THE SUGAR RIVER AT WEST CLAREMONT. * UNTIL LATE TONIGHT. * AT 07PM MONDAY THE STAGE WAS 7.8 FEET. * FLOOD STAGE IS 7.0 FEET. * THE RIVER WILL CONTINUE TO FALL TO BELOW FLOOD STAGE BY TONIGHT. 307 PM EST TUE JAN 14 2014 ...FLOOD WARNING EXTENDED UNTIL LATE TONIGHT... THE FLOOD WARNING CONTINUES FOR THE SUGAR RIVER AT WEST CLAREMONT. * UNTIL LATE TONIGHT. * AT 2 PM TUESDAY THE STAGE WAS 7.1 FEET. * FLOOD STAGE IS 7.0 FEET. * THE RIVER WILL REMAIN STEADY JUST ABOVE ITS 7 FOOT FLOOD STAGE THROUGH THIS EVENING...BEFORE FALLING BELOW FLOOD STAGE LATE TONIGHT. 1144 AM EST TUE JAN 14 2014 ...FLOOD WARNING EXTENDED UNTIL THIS EVENING... THE FLOOD WARNING CONTINUES FOR THE SUGAR RIVER AT WEST CLAREMONT. * UNTIL THIS EVENING. * AT 10 AM TUESDAY THE STAGE WAS 7.1 FEET. * FLOOD STAGE IS 7.0 FEET. * THE RIVER WILL CONTINUE TO FALL TO BELOW FLOOD STAGE LATER TODAY. th The flood warning was cancelled on 16 Jan
20140115145653BethlehemNHAmmonoosuc River01/12/20142014Break-up44.26861111-71.63083333-BETN3released-RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 308 AM EST SUN JAN 12 2014 THE FLOOD WARNING IS CANCELLED FOR THE AMMONOOSUC RIVER AT BETHLEHEM. * AT 2AM SUNDAY THE STAGE WAS 6.7 FEET and continues to fall. * FLOOD STAGE IS 8.0 FEET.
20140115161540ConwayNHSaco River01/12/20142014Break-up43.99525-71.11963888--released-Breakup ice jams occurred throughout New England as a result of steady rain Saturday 11 Jan 14 followed by temperatures in the 40s on Sunday. One area affected was a road leading to the Transvale Acres development, off West Side Rd, adjacent to the Saco River in Conway NH. North Conway received 1.61 inches of rain over the weekend. Minor flooding occurred by no major problems were reported.
20140115134453ThorntonNHPemigewasset River01/12/20142014Break-up43.90666666-71.68158333-plmn3released-Mild, warm, rainy weather followed sub-zero temps across the Northeast 12 Jan 2014, resulting in numerous breakup jams and flooding across the region. The Pemigewasset River in Thornton NH was one of those locations causing some basements to flood. Chief Daniel Defosses of the Campton- Thornton Fire Department noted "It seems to have started to flow a lot better, though. So, it doesn't seem to be a major concern, and we're hoping we don't get a lot of rain in the near future."
20140115124906PlymouthNHPemigewasset River01/12/20142014Break-up43.75916666-71.68611111-plmn3released-On 12 Jan 2014 the National Weather Service issued a Flood Warning for breakup ice jam flooding on the Pemigewasset River in Plymouth NH. The river gage reached 15.2 ft, resulting in Minor Flooding, which occurs at 13.0 ft. Police reported no flooding problems, but wanted residents to be ready to move to higher ground if necessary. RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 828 AM EST SUN JAN 12 2014 ...FLOOD WARNING EXTENDED UNTIL THIS EVENING... THE FLOOD WARNING CONTINUES FOR THE PEMIGEWASSET RIVER AT PLYMOUTH. * UNTIL THIS EVENING. * AT 8 AM THIS MORNING THE STAGE WAS 15.2 FEET. * FLOOD STAGE IS 13.0 FEET. * AN ICE JAM HAS CAUSED THE RIVER TO RISE RAPIDLY THIS MORNING. ICE JAMS ARE VERY UNPREDICTABLE. IT IS IMPOSSIBLE TO KNOW WHEN THIS JAM MIGHT BREAK AND MOVE DOUWNSTREAM. ICE JAMS CAN BREAK AND MOVE DOWNSTREAM AND THEN JAM AGAIN CAUSING WATER TO RISE RAPIDLY IN ANOTHER LOCATION. RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 228 PM EST SUN JAN 12 2014 ...FLOOD WARNING EXTENDED UNTIL LATE TONIGHT... THE FLOOD WARNING CONTINUES FOR THE PEMIGEWASSET RIVER AT PLYMOUTH. * UNTIL LATE TONIGHT. * AT 2 PM SUNDAY THE STAGE WAS 15.1 FEET. * FLOOD STAGE IS 13.0 FEET. * THE RIVER WILL SLOWLY FALL TO BELOW FLOOD STAGE THIS EVENING. RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 1232 AM EST MON JAN 13 2014 ...FLOOD WARNING EXTENDED UNTIL THIS AFTERNOON... THE FLOOD WARNING CONTINUES FOR THE PEMIGEWASSET RIVER AT PLYMOUTH. * UNTIL THIS AFTERNOON. * AT 12AM MONDAY THE STAGE WAS 13.9 FEET. * FLOOD STAGE IS 13.0 FEET. * THE RIVER WILL CONTINUE TO FALL TO BELOW FLOOD STAGE THIS MORNING. AT 14.0 FEET, WATER REACHES THE PARKING LOT BEHIND THE PSU ICE ARENA. RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 840 AM EST MON JAN 13 2014 THE FLOOD WARNING IS CANCELLED FOR THE PEMIGEWASSET RIVER AT PLYMOUTH. * AT 8 AM MONDAY THE STAGE WAS 12.7 FEET AND SLOWLY FALLING. * FLOOD STAGE IS 13.0 FEET.
20130306132751North StratfordNHConnecticut River02/21/20132013Freeze-up44.75361111-71.6263888801129500-unknown-The following was noted in a Winter/Spring Flood Potential Outlook by the National Weather Service in Gray ME at 130 PM EST Thu 21 Feb 2013, following a region-wide mid-winter thaw and breakup 31 Jan - 1 Feb 2013: RIVER ICE HAS REESTABLISHED ITSELF ON SMALLER RIVERS AND STREAMS OVER THE PAST 2 WEEKS. THERE IS CURRENTLY AN ICE JAM LOCATED ON THE CARRABASSETT RIVER NEAR NORTH ANSON AND THE CONNECTICUT RIVER NEAR NORTH STRATFORD. SMALLER JAMS EXIST ON OTHER RIVERS AS WELL. THESE JAMS HAVE ESSENTIALLY FROZEN IN PLACE AND WILL REMAIN UNTIL THE NEXT WARMUP. THESE ICE JAMS MAY CAUSE FLOODING DURING THE SPRING MELT.
20130214130245BethlehemNHAmmonoosuc River01/31/20132013Break-up44.26888888-71.63111111--not flooding-A midwinter thaw with record breaking temperatures and rain across central and northeastern states from 29-31 Jan 2013 has resulted in numerous breakup jams across the region. The National Weather Service in Gray ME issued a River Flood Statement at 256 PM EST Thu 31 Jan 2013 cancelling a Flood Warning that had been in effect. At 2 PM the stage was 7.0 ft. Flood Stage is 8.0 ft. "THE RIVER IS SLOWLY FALLING AS WATER IS MAKING ITS WAY AROUND AND UNDER THE ICE JAM. DOWNSTREAM AT BATH ABBOTT AVENUE WAS CLOSED DUE TO AN ICE JAM THERE. THE RUNOFF FROM LAST NIGHTS RAIN AND MELTING SNOW IS SLOWING AND WATER LEVELS SHOULD CONTINUE TO RECEDE TONIGHT."
20130215145346West ClaremontNHSugar River01/31/20132013Break-up43.3875-72.362501152500-unknown-A midwinter thaw with record breaking temperatures and rain across central and northeastern states from 29-31 Jan 2013 has resulted in numerous breakup jams across the region. A Flood Warning was issued by the National Weather Service in Gray ME at 146 PM EST Thu 31 Jan 2013 for the Sugar River at West Claremont due to an ice jam, causing water levels to fluctuate rapidly. At 12 PM Thu the stage was 6.0 feet. Flood Stage is 7.0 ft. Minor Flooding was forecast.
20130215141224ConwayNHSaco River01/31/20132013Break-up43.99083333-71.0905555501064500-unknown-A midwinter thaw with record breaking temperatures and rain across central and northeastern states from 29-31 Jan 2013 has resulted in numerous breakup jams across the region. The National Weather Service in Gray ME issued a Flood Warning for the Saco River in Conway NH at 1220 PM EST Thu 31 Jan 2013, as a result of an ice jam, causing the river stage to fluctuate rapidly. At 11 AM the stage was 7.7 ft. Flood Stage is 9.0 ft. Minor flooding was forecast. At 305 PM EST Thu 31 Jan 2013 the NWS cancelled the flood warning following the release of the ice jam. The stage at 1 PM was 5.7 ft.
20130215130439PlymouthNHPemigewasset River01/31/20132013Break-up43.76416666-71.68501076500-unknown-A midwinter thaw with record breaking temperatures and rain across central and northeastern states from 29-31 Jan 2013 has resulted in numerous breakup jams across the region. A Flood Warning was issued by the National Weather Service in Gray ME at 312 PM EST Thu 31 Jan 2013 for the Pemigewasset River at Plymouth NH affecting Grafton County. At 3 PM the stage was 11.7 ft. Flood Stage is 13.0 ft. Minor flooding was forecast. The jam caused water levels to rise 8 feet in 2 hours.
20130215123325WoodstockNHPemigewasset River01/31/20132013Break-up44.00111111-71.68277777--unknown-A midwinter thaw with record breaking temperatures and rain across central and northeastern states from 29-31 Jan 2013 has resulted in numerous breakup jams across the region. According to a Flood Warning issued by the National Weather Service in Gray ME at 1017 AM EST Thu 31 Jan 2013, an ice jam had formed on the Pemigewasset River in the Woodstock NH area, causing water levels to rapidly fluctuate. At 9 AM the stage was 7.6 ft. Flood Stage is 9.0 ft. The river was forecast to rise above Flood Stage by noon and fall below Flood Stage by that evening.
20130214162356North StratfordNHConnecticut River01/31/20132013Break-up44.75361111-71.62638888--unknown-A midwinter thaw with record breaking temperatures and rain across central and northeastern states from 29-31 Jan 2013 has resulted in numerous breakup jams across the region. A River Flood Statement issued by the National Weather Service in Gray ME, at 941 AM EST Thu 31 Jan 2013 reported an ice jam on the Connecticut River at North Stratford NH, with water levels fluctuating rapidly. At 9 AM the stage was 11.1 ft. Flood Stage is 13.0 ft. The river was forecast to continue to fluctuate rapidly due to the ice jam.
20131211110530RumneyNHBaker River03/06/20122012-43.79555555-71.8458333301076000---USGS Water Resources Data for New Hampshire WY 2012 reported an instantaneous low flow of 25cfs on 6-MAR-2012 due to freezeup at USGS gaging station 01076000 Rumney, NH. The annual minimum gage height was not reported.
20131211112007BethlehemNHAmmonoosuc River02/27/20122012-44.26888888-71.6291666601137500---USGS Water Resources Data for New Hampshire WY 2012 reported an instantaneous low flow of 45cfs on 27-FEB-2012 due to freezeup at USGS gaging station 01137500 Bethlehem, NH. The gage height was not reported.
20131211092014West ClaremontNHSugar River12/08/20112012-43.38660555-72.3621501152500---USGS Water Resources Data for New Hampshire WY 2012 reported an annual maximum peak stage of 4.68ft on 8-DEC-2011 due to an ice jam at USGS gaging station 01152500 West Claremont, NH. The average daily discharge was 2,250cfs.
20131211090924North ChichesterNHSuncook River03/12/20112011-43.25638888-71.372501089500---USGS Water Resources Data for New Hampshire WY 2011 reported an maximum peak discharge of 1,600cfs on 12-MAR-2011 due to an ice jam at USGS gaging station 01089500 North Chichester, NH.
20131211111311HinsdaleNHAshuelot River03/08/20112011-42.78527777-72.4866666601161000---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 7.95ft on 8-MAR-2011 due to an ice jam at USGS gaging station 01161000 Hinsdale, NH. The average daily discharge was estimated at 4,790cfs.
20131211090804North ChichesterNHSuncook River03/08/20112011-43.25638888-71.372501089500---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 9.99ft on 8-MAR-2011 due to an ice jam at USGS gaging station 01089500 North Chichester, NH. The average daily discharge was estimated at 1,250cfs.
20131211093655ConcordNHSoucook River03/08/20112011-43.21305555-71.4805555501089100---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 10.05ft on 8-MAR-2011 due to an ice jam at USGS gaging station 01089100 Concord, NH. The average daily discharge was estimated at 1,140cfs.
20110311103502North StratfordNHConnecticut River03/08/20112011Break-up44.74972222-71.6316666601129500-released-An eyewitness account of an ice jam located on the Connecticut River was reported by Linnzi Furman, former CRREL employee, to Dr. Kate White, IWRSS, on Thu 10 Mar 2011. The jam was at the confluence with the Nulhegan River, and had resulted in Bankful conditions, with flooding occurring in backyards. The USGS station (01129500) at North Stratford NH shows a steep increase in stage at midnight Sun 6 Mar 2011, rising from approximately 6.5 ft to over 12 ft by early Mon 7 Mar 2011. The stage has slowly decreased, with the latest reading being 10.61 ft at 830 AM EST Fri 11 Mar 2011. Flood stage is 13.0 ft.
20131211111555West SwanzeyNHAshuelot River03/08/20112011-42.87111111-72.3283333301160350---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 10.27ft on 8-MAR-2011 due to an ice jam at USGS gaging station 01160350 West Swanzey, NH. The average daily discharge was estimated at 3,640cfs.
20131211103148PeterboroughNHContoocook River03/07/20112011-42.8625-71.9597222201082000---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 6.92ft on 7-MAR-2011 due to an ice jam at USGS gaging station 01082000 Peterborough, NH. The average daily discharge was estimated at 1,240cfs.
20110307102740West ClaremontNHSugar River03/07/20112011Break-up43.3875-72.362501152500-released-The National Weather Service in Gray ME issued a Flood Warning at 848 AM EST Mon 7 Mar 2011 containing the following information: THE NATIONAL WEATHER SERVICE IN GRAY HAS ISSUED A * FLOOD WARNING FOR THE SUGAR RIVER AT WEST CLAREMONT * FROM THIS MORNING UNTIL TUESDAY MORNING. * AT 7 AM TODAY THE STAGE WAS...6.5 FEET. * MINOR FLOODING IS FORECAST. * FLOOD STAGE IS 7.0 FEET. * THE RIVER WILL LIKELY RISE ABOVE FLOOD STAGE IN THE NEXT HOUR OR TWO. IT IS DIFFICULT TO KNOW HOW HIGH THE RIVER WILL RISE BEHIND THIS ICE JAM. PEOPLE LIVING ALONG THE RIVER SHOULD CONTINUE TO MONITOR THE SITUATION CLOSELY. > The following information was reported in a NWS River Flood Statement published at 818 AM Tue 8 Mar 2011: RIVER FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAY, ME 818 AM EST TUE MAR 8 2011 ...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN NEW HAMPSHIRE PEMIGEWASSET RIVER AT PLYMOUTH AFFECTING GRAFTON COUNTY SUGAR RIVER AT WEST CLAREMONT AFFECTING SULLIVAN COUNTY SUNCOOK RIVER AT NORTH CHICHESTER AFFECTING MERRIMACK COUNTY > 818 AM EST TUE MAR 8 2011 ...FLOOD WARNING EXTENDED UNTIL THIS EVENING... THE FLOOD WARNING CONTINUES FOR THE SUGAR RIVER AT WEST CLAREMONT. * UNTIL THIS EVENING. * AT 7 AM TODAY THE STAGE WAS 9.1 FEET. * FLOOD STAGE IS 7.0 FEET. * THE RIVER WILL CONTINUE TO FALL TO BELOW FLOOD STAGE BY LATE THIS AFTERNOON.
20131211091831West ClaremontNHSugar River03/07/20112011-43.38660555-72.3621501152500---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 10.10ft on 7-MAR-2011 due to an ice jam at USGS gaging station 01152500 West Claremont, NH. The average daily discharge was estimated at 1,710cfs.
20131211092425GoffstownNHSouth Branch Piscataquog River03/07/20112011-43.01361111-71.6469444401091000---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak stage of 11.54ft on 7-MAR-2011 due to an ice jam at USGS gaging station 01091000 Goffstown, NH. The average daily discharge was estimated at 1,280cfs.
20110309151302PlymouthNHPemigewasset River03/07/20112011Break-up43.75916666-71.6861111101076500PLMN3released-A Flood Warning was issued by the National Weather Service in Gray ME at 955 AM EST Mon 7 Mar 2011 for the Pemigewasset River at Plymouth NH affecting Grafton County. Heavy rain Sat 5 March prompted many New England rivers to run and jam. A jam on the Pemigewasset caused the stage at the Plymouth gage (PLMN3) to rise above the Flood Stage of 13.0 ft, cresting at 17.03 ft Mon 7 Mar 2011 at 430 PM. The level has continued to slowly recede, with the latest observed value being 11.11 ft at 130 PM Wed 9 Mar 2011. > With additional rain falling in the area 10-11 Mar 2011, stages were expected to rise again. In a 'Memo for Record' issued by Andy Tuthill, CRREL on 11 Mar 2011, in which the river ice conditions in NH and VT were reported following an aerial recon on 8 Mar 2011 by Andy, he noted, "The Pemigewasset above Plymouth had mostly run with the exception of a mile long jam in Thornton and a 4-mile-long jam in Plymouth. AHPS predicts a 1.5 ft rise in the next 24 hours which would bring the river to within 2 ft of flood stage at Plymouth. The prospect of a sudden release of the Plymouth jam is unlikely as the downstream ice cover appeared more-of-less intact (at least on Tues.). The potential release of the Thornton jam impacting the Plymouth one is a concern, but the surge of water and ice would likely attenuate considerably in the 10 intervening rivermiles. "
20131211102050PlymouthNHPemigewasset River03/07/20112011-43.75902777-71.685501076500---USGS Water Resources Data for New Hampshire WY 2011 reported an annual maximum peak discharge of 17000cfs on 7-MAR-2011 due to an ice jam at USGS gaging station 01076500 Plymouth, NH.
20110308140451BathNHAmmonoosuc River03/06/20112011Break-up44.17145-71.96681388--released-The National Weather Service in Gray ME issued a Flood Advisory at 352 PM EST Sun 6 Mar 2011 for norther Grafton County NH until 1145 PM. NH Emergency Management Officials reported a breakup ice jam in the Town of Bath located on the Ammonoosuc River near route 302, with water out of its banks, but not affecting any roads at that time. Heavy rain across the region Sat 5 March has created significant runoff, causing ice runs throughout New England. > Chris Ellms, Manager of Bretton Woods Ski Area, reported that the jam had flooded the clubhouse and maintenance shed of the Mt. Washington Hotel Golf Course.
20110308124104PeterboroughNHContoocook River03/06/20112011Break-up42.8625-71.9597222201082000-released-The following information was reported in a Flood Warning issued by the National Weather Service in Taunton MA at 1018 AM EST Mon 7 Mar 2011: ...FORECAST FLOODING CHANGED FROM MINOR TO MODERATE SEVERITY FOR THE FOLLOWING RIVERS IN NEW HAMPSHIRE... CONTOOCOOK RIVER AT PETERBOROUGH AFFECTING CHESHIRE AND HILLSBOROUGH COUNTIES HEAVY RAINFALL COMBINED WITH SNOW MELT AND A COUPLE OF ICE JAMS HAS SET THE STAGE FOR A DANGEROUS RISE OF THE CONTOOCOOK RIVER AT PETERBOROUGH. TWO ICE JAMS HAVE BEEN REPORTED UPSTREAM OF THE PETERBOROUGH GAGE. ONE WAS NEAR THE ROUTE 202 AND SHARON ROAD INTERSECTION WITH ICE BUILDUP BEHIND THE BRIDGE. A SECOND ICE JAM WAS REPORTED AT THE GRANITE ARCH BRIDGE. IF THE ICE JAMS SHOULD SUDDENLY BREAK...THE CONTOOCOOK RIVER COULD RISE RAPIDLY IN A SHORT PERIOD OF TIME. > Additional information was provided by Joe Lennox, the Fire Chief at Peterborough NH on 7 Mar 2011. He said that the Contoocook River was jammed at two bridges in the village and a larger jam had formed downstream of town. They had one street closed with about 12 inches of water on it. > According to the hydrograph of the USGS gage at Peterborough NH (01082000) the stage dropped from 6.8 ft to 5.0 ft on Mon 7 Mar 2011 around noon. Flood Stage is 6.0 ft. The Discharge (Q) graph at the Peterborough station also indicates that the ice cover released at the same time. The stage has remained below Flood Stage as of 1145 EST Tue 8 Mar 2011.
20110308084638West LebanonNHConnecticut River03/06/20112011Break-up43.64611111-72.3127777701144500-released-A Flood Warning was issued by the National Weather Service in Gray ME at 1001 PM EST Sun 6 Mar 2011, reporting the following information: THE NATIONAL WEATHER SERVICE IN GRAY HAS ISSUED A FLOOD WARNING FOR THE FOLLOWING RIVER IN NEW HAMPSHIRE...VERMONT CONNECTICUT RIVER AT WEST LEBANON AFFECTING GRAFTON...SULLIVAN AND WINDSOR COUNTIES .AN ICE JAM HAS CAUSED THE CONNECTICUT RIVER AT WEST LEBANON TO JUMP OVER 9 FEET IN LESS THAN TWO HOURS AND IS NOW APPROACHING FLOOD STAGE. THE RIVER WILL LIKELY TOP FLOOD STAGE OVERNIGHT AND CONTINUE TO FLUCTUATE THROUGH THE NIGHT DUE TO THE UNPREDICTABLE NATURE OF ICE JAMS. RAIN OR MIXED PRECIPITATION WILL CONTINUE TO CHANGE TO SNOW THROUGH THE NIGHT, IF IT HASN'T ALREADY AND TEMPERATURES WILL FALL INTO THE 20S. THIS WILL BRING AN END TO RUNOFF FROM RAIN AND MELTING SNOW AND WILL HELP THE ICE JAM TO FREEZE UP AGAIN. > THE NATIONAL WEATHER SERVICE IN GRAY HAS ISSUED A * FLOOD WARNING FOR THE CONNECTICUT RIVER AT WEST LEBANON * FROM THIS EVENING UNTIL MONDAY MORNING. * AT 930 PM SUNDAY THE STAGE WAS...17.5 FEET AND RISING * MINOR FLOODING IS FORECAST. * FLOOD STAGE IS 18.0 FEET. * FORECAST TO RISE ABOVE FLOOD STAGE OVERNIGHT THEN FALL BELOW FLOOD STAGE LATE TONIGHT OR MONDAY MORNING. According to a Memo for Record by Andy Tuthill, CRREL, on 11 Mar 2011, which provided information from an aerial recon flown on 8 Mar 2011, "The White River has run and jammed on the Connecticut between Plainfield and White River Jct. This jam was about 3 miles long and causing no flooding." A photo accompanies this report.
20110312124245RumneyNHBaker River03/06/20112011Break-up43.79555555-71.8458333301076500-released-In a 'Memo for Record' issued by Andy Tuthill, CRREL on 11 Mar 2011, in which the river ice conditions in NH and VT were reported following an aerial recon on 8 Mar 2011, following heavy rainfall on 5-6 Mar 2011, Andy reported, "A mile-long (jam on) the Baker River in Rumney was causing minor field flooding. With the expected rise of 1.5 ft Baker at Rumney will still remain several ft below the flood level."
20131211093447ConcordNHSoucook River02/26/20102010-43.21305555-71.4805555501089100---USGS Water Resources Data for New Hampshire WY 2010 reported an annual maximum peak stage of 10.83ft on 26-FEB-2010 due to an ice jam at USGS gaging station 01089100 Concord, NH. The average daily discharge was estimated at 1,400cfs.
20131211110043North StratfordNHConnecticut River01/26/20102010-44.74888888-71.6291666601129500---USGS Water Resources Data for New Hampshire WY 2010 reported an annual maximum peak stage of 12.14ft on 26-JAN-2010 due to an ice jam at USGS gaging station 01129500 North Stratford, NH. The average daily discharge was estimated at 3,290cfs.
20131211091627West ClaremontNHSugar River01/26/20102010-43.38660555-72.3621501152500---USGS Water Resources Data for New Hampshire WY 2010 reported an annual maximum peak stage of 9.51ft on 26-JAN-2010 due to an ice jam at USGS gaging station 01152500 West Claremont, NH. The average daily discharge was estimated at 1,760cfs.
20100126185423West ClaremontNHSugar River01/26/20102010Break-up43.38660555-72.3621501152500WCLN3released-The National Weather Service in Gray ME issued a Flood Warning for the Sugar River in West Claremont NH at 1250pm 26 Jan 2010. Warm temperatures and heavy rain regionally caused the Sugar River to run and jam, causing the river stage to jump 5 feet. At 12pm the stage was 9.2 ft and at 4:30pm it had fallen to 8.93ft and continuing to slowly fall. Flood Stage is 7.0 ft. Minor flooding was occurring. According to the hydrograph from USGS gage 01152500, the stage fell to below Flood Stage the following afternoon. Condition changed from "stage erratic, varying widely" to "not flooding" 16Feb2010, MLC.
20131211101850PlymouthNHPemigewasset River01/26/20102010-43.75902777-71.685501076500---USGS Water Resources Data for New Hampshire WY 2010 reported an annual maximum peak stage of 12.74ft on 26-JAN-2010 due to an ice jam at USGS gaging station 01076500 Plymouth, NH. The average daily discharge was estimated at 11,000cfs.
20100215184841PlymouthNHPemigewasset River01/26/20102010Break-up43.75902777-71.685501076500-unknown-In a Hydrologic Statement issued by the National Weather Service in Gray ME at 249am EST Tue 26 Jan 2010, the Pemigewasset River at Plymouth NH was near, but below Flood Stage as a result of river ice. Flood Stage is 13.0 ft. The stage at 230am was 12.5 ft, and by 10am had dropped to 11.9 ft, and continued to steadily fall. Warm temperatures and heavy rain led to snowmelt and ice jamming across the region the day before.
20100126141705North StratfordNHConnecticut River01/26/20102010Break-up44.7505-71.631101129500NSTN3released-The National Weather Service Northeast River Forecast Center in Taunton MA issued a Hydrometeorological Coordination Message at 1019am EST Tue 26 Jan 2010. A low pressure system brought heavy rain to the area over the past 24 hours. One to three inches of rain fell across eastern NY and much of New England. This, and temperatures up to 50F along with high winds led to significant snowmelt, resulting in several areas above Flood Stage, with some in southern NY reaching Moderate Flood level. The Connecticut River from Hartford through Middletown was forecast to crest just below Flood Stage. A NWS Flood Warning was issued for the Connecticut River at North Stratford VT by Gray ME Weather Forecast Office at 1239 am EST 26 Jan 2010. Ice movement and an ice jam were affecting river levels there, resulting in fluctuations in the river stage. At 12am EST 26 Jan 2010, the stage was 11.8 ft. Flood Stage is 13.0 ft. The river was forecast to rise to near 13.4 ft that morning, and fall below Flood Stage later that morning.
20100126201135BathNHAmmonoosuc River01/25/20102010Break-up44.16681111-71.96674722--released2 homes evacuated, damage to Bath bridgeThe following article was published by Adam Sullivan, WCAX.com, 'Rising river ravages historic N.H. covered bridge', Bath, New Hampshire - January 26, 2010. Water continued to pour under the covered bridge in Bath, N.H., but by Tuesday afternoon, the level dropped a lot compared with 12 hours earlier. It's all due to a rainstorm that ripped through the region Monday. "Last night was crazy," said Joel Godston of North Haverhill, N.H. "We saw winds that I would guess were 45 to 50 miles an hour and trees we bending over and breaking off." Late Monday night and into Tuesday morning the Ammonoosuc River continued to rise and rescue officials knew there was going to be trouble at the bridge. "Upon my arrival... I watched the water and ice going under the bridge and it was almost touching the bottom of the side boards there was so much water and ice going by," Bath Police Chief Dennis MacKay said. Ice had given way up steam and began pounding the bridge's support beams. Ice chucks clogged the hydro plant intake area just below the bridge causing a deluge that destroyed the driveway below. The bridge was closed indefinitely because of damaged supports and remnants of the flooding still remain down river. "There was no question in my mind that the bridge was going to sustain some damage," MacKay said. "I actually turned on the video camera in my car because I was half expecting it to get swept downstream." Large blocks of ice completely blanket low-lying fields on the river's edge. Several roads that were closed Monday night have been re-opened except for the Abbott Ave, which was still closed to traffic Tuesday evening. "It was ice-out," MacKay explained. "It came down from Littleton, Lisbon, Sugar Hill; a couple different tributaries that fed into it." It's something that happens every couple of years in this part of Ammonoosuc River which residents seem to take in stride. "We'll survive, we will," Godston said. "People up here are in God's country and they are resilient." Two homes had to be evacuated during the flood, but law enforcement officials say that luckily, despite the fury on this raging river, no injuries have been reported. Grafton County has a "Code Red" alert system that dials residents near the Ammonoosuc River when flood dangers are high. That system was used Monday night. Adam Sullivan - WCAX News
20131211092818WebbNHSouth Branch Ashuelot River01/25/20102010-42.87222222-72.2069444401160000---USGS Water Resources Data for New Hampshire WY 2010 reported an annual maximum peak stage of 6.19ft on 25-JAN-2010 due to an ice jam at USGS gaging station 01160000 Webb, NH. The average daily discharge was estimated at 210cfs.