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| 20250506163529 | Aniak | AK | Kuskokwim River | 05/29/2025 | 2025 | Break-up | 61.598039 | -159.61023 | - | - | released | No flooding was reported. | Ice jam that released from Crooked Creek on 4/29 re-jammed at Aniak. |
| 20250506163903 | Crooked Creek | AK | Kuskokwim River | 05/29/2025 | 2025 | Break-up | 61.820808 | -158.109016 | - | - | released | No flooding was reported. | Ice jam formed near Crooked Creek on the Kuskokwim River. |
| 20250527143124 | Old Crow, Yukon | AK | Porcupine River | 05/23/2025 | 2025 | Break-up | 67.31271 | -141.47567 | - | - | released | Moderate flooding reported in Old Crow. | Ice jammed just west of the Canadian Border, backing up past Old Crow (Yukon). River level came up 18ft in less than 24 hours. Jam released on 24 May. |
| 20250513151346 | Galena | AK | Yukon River | 05/09/2025 | 2025 | Break-up | 64.824049 | -157.353987 | - | - | released | Water levels were low and no flooding was reported. | Breakup front slowed/jammed near Bishop Rock. |
| 20250513171048 | Napakiak | AK | Kuskokwim River | 05/08/2025 | 2025 | Break-up | 60.64792 | -162.1055 | - | - | released | Minor flooding was reported in Napakiak. | Ice jam below Napakiak near the confluence of the Kuskokwim and Johnson Rivers. Released on 5/10. |
| 20250513151706 | Fort Yukon | AK | Yukon River | 05/07/2025 | 2025 | Break-up | 66.56531 | -145.50128 | - | - | released | Minor flooding reported in Fort Yukon around when jam formed, but water levels receded quickly. | Jam below Fort Yukon near Six Mile Island. Released on 5/11. |
| 20250506162237 | Lower Kalskag | AK | Kuskokwim River | 05/05/2025 | 2025 | Break-up | 61.502589 | -160.36438 | - | - | released | Significant flooding in Upper Kalskag. Waters rose so quickly that the high school had to be evacuated by boat. | Ice jam that released from Aniak on 5/4 re-jammed below lower Kalskag. Description from River Notes: " Kuskokwim River is open and flowing with remnants of Aniak jam ice to Father Isaacs fish camp upstream of Kalskag. The main flow diverts into Old River 1st Slough above an ice jam that runs from David Dorris' through Upper and Lower Kalskag. This ice jam formed late morning on Monday, where it setup off the tank farm. Water levels in Kalskag rose through the low channel and flooded the road between Upper and Lower, surrounded the Power Plant and the Upper Kalskag school. The ANICA store was closed and children were released from school early. Boats were used to transport children and folks between Lower and Upper Kalskag, Water levels began to drop slowly around 16:30 AKDT, as more water diverted through 1st Slough and the jam front marched downstream toward Lower. As of 21:30, the jam continues to hold at the mouth of Old River and the islands downstream of Lower by original intact ice possibly stuck due to low water levels, water levels in Kalskag have not risen, and Old River outlet is getting plugged; water remains on the roads at the low spots, which are still impassable, but has not gotten any deeper."
Released on 5/6. |
| 20250429175301 | Red Devil | AK | Kuskokwim River | 04/28/2025 | 2025 | Break-up | 61.792657 | -157.353101 | - | - | released | No flooding was reported. | Second jam (in as many days) jam at Red Devil. |
| 20250429152855 | Red Devil | AK | Kuskokwim River | 04/27/2025 | 2025 | Break-up | 61.80981 | -157.44134 | - | - | released | No flooding was reported. | Breakup jam formed shortly after first ice movement on the Kuskokwim River near Red Devil evening over 27 April. Jam reportedly released sometime overnight and water is receding. Locals report light snow pack and recent rain have caused much of the ice to decay and the surface looks slushy. |
| 20250429162507 | Akiachak | AK | Kuskokwim River | 04/27/2025 | 2025 | Break-up | 60.90768 | -161.46577 | - | - | released | No flooding was reported. | Breakup started on 27 April near Akiachak on the Kuskokwim river; ice run jammed late that same day and remains in place (c. 4/29). River level is now dropping. Location inferred. |
| 20250429132036 | Salcha | AK | Tanana River | 04/23/2025 | 2025 | Break-up | 64.55117 | -147.06149 | - | - | released | Area around at least 2 residences was inundated; no damage reported c. 4/29/25. | A breakup jam formed briefly on the Tanana River and caused flooding around several residences near Old Richardson Hwy when backflows avoided the riverbank levee by way of its drainage ditch. The jam released on 4/24.
https://www.facebook.com/groups/FreshEyesOnIce/permalink/7747249032065782 |
| 20250401141904 | Quinhagak | AK | Kanektok River | 01/26/2025 | 2025 | Break-up | 59.750653 | -161.916445 | - | - | released | Observers in Quinhagak reported:
- Main impact from the recent ice jam was the road to the 'New Pump House' (labeled on DCED map)
- As of today (1/27/25), the road is still flooded and not passable, water treatment plant operators are waiting for it to freeze.
- Reports of flooding reaching two homes near the old Airport. No reports that the homes had water above the first floor. It may be that water just reached the base of the foundations.
- The flooding appears to be steady and has not worsened since the initial reports over the weekend. | Break-up jam formed on the Kanektok River near Quinhagak, AK. |
| 20241217184206 | Anchor Point | AK | Anchor River | 12/10/2024 | 2025 | Freeze-up | 59.762281 | -151.822785 | - | - | released | Flood advisory issued and minor flooding reported in lowlands by river. | Freeze-up jam reported on the Anchor River near Anchor Point, AK. |
| 20240528143713 | Emmonak | AK | Yukon River | 05/23/2024 | 2024 | Break-up | 62.62719 | -164.69773 | - | - | released | Minor flooding reported in Emmonak and Alakanuk, including Emmonak Airport road and at least one residence. | Ice jam inferred downstream of Emmonak and Alakanuk. Jam temporarily released on 23 May before re-jamming. Reported released and ice-free on 24 May. |
| 20240521144845 | Buckland | AK | Buckland River | 05/18/2024 | 2024 | Break-up | 65.99724 | -161.17441 | - | - | released | No flooding was reported. | Ice jam reported just downstream of Buckland. Water rose 5ft on 18 May but locals report it would need to rise another 10 ft to overtop the bank. |
| 20240521145757 | Pilot Station | AK | Yukon River | 05/18/2024 | 2024 | Break-up | 62.00954 | -163.25024 | - | - | released | Flooding of low-lying areas and several residences in Pilot Station were reported. No flooding in St. Marys. | Jam reported between Pilot Station and Pitkas Point; location inferred from very cloudy Planet image from 17 May, just above confluence with Andreafsky River. Jam released on 19 May. |
| 20240521141625 | Marshall | AK | Yukon River | 05/13/2024 | 2024 | Break-up | 61.79456 | -162.04435 | - | - | released | No flooding was reported. | RiverWatch reported a small ice jam near the divergence of the Yukon and the slough just upstream of town. The jam blocked the upper part of the slough on the right side. |
| 20240514170434 | Nulato | AK | Yukon River | 05/13/2024 | 2024 | Break-up | 64.639159 | -158.285805 | - | - | released | No flooding was reported. | Nulato resident reported localized ice jam near Nine Mile Island. Description expanded to 'a series of jams' on 14 May. Water is rising, but no risk of flooding yet. Released 14 May. |
| 20240514165642 | Russian Mission | AK | Yukon River | 05/12/2024 | 2024 | Break-up | 61.5832 | -161.927 | - | - | released | No flooding was reported. | Short-lived ice jam reported below Russian Mission. Released same day (12 May). |
| 20240514165907 | Circle | AK | Yukon River | 05/12/2024 | 2024 | Break-up | 65.570386 | -143.772535 | - | - | released | No flooding was reported at Circle as most of the ice around and below town had already evacuated. | What was previously the ice front above Circle became an ice jam as the Yukon continued to decay downstream. Ice held for 7 days before releasing on 12 May. |
| 20240514161405 | Akiachak | AK | Kuskokwim River | 05/08/2024 | 2024 | Break-up | 60.840652 | -161.45984 | - | - | released | Minor flooding reported in Akiachak.
Major flooding reported in Kwethluk. | One of a series of ice jams that formed on the Kuskokwim River near Akiachak, which diverted the Kusko's flow into the Kuskokuak Slough and overland, causing major flooding in Kwethluk. Released on 10 May. |
| 20240514160904 | Kwethluk | AK | Kwethluk River | 05/08/2024 | 2024 | Break-up | 60.791383 | -161.409953 | - | - | released | Major flooding in Kwethluk. Locals reported tundra was very saturated when the Akiachak jams and this jam formed, leading to overland flooding from both the Kwethluk River and Kuskokuak (diverted from Kusko mainsteam). Kwethluk River jam released on 12 May, and flood waters began to recede. | Ice jam formed a few bends above Kwethluk on the Kwethluk River. |
| 20240514161724 | Akiachak | AK | Kuskokwim River | 05/08/2024 | 2024 | Break-up | 60.90647 | -161.46589 | - | - | released | Minor flooding reported in Akiachak.
Major flooding reported in Kwethluk. | One of a series of ice jams that formed on the Kuskokwim River near Akiachak, which diverted the Kusko's flow into the Kuskokuak Slough and overland, causing major flooding in Kwethluk. Released on 10 May. |
| 20240514161551 | Akiachak | AK | Kuskokwim River | 05/08/2024 | 2024 | Break-up | 60.799238 | -161.538543 | - | - | released | Minor flooding reported in Akiachak.
Major flooding reported in Kwethluk. | One of a series of ice jams that formed on the Kuskokwim River near Akiachak, which diverted the Kusko's flow into the Kuskokuak Slough and overland, causing major flooding in Kwethluk. Released on 10 May. |
| 20240514161630 | Akiachak | AK | Kuskokwim River | 05/08/2024 | 2024 | Break-up | 60.903046 | -161.412986 | - | - | released | Minor flooding reported in Akiachak.
Major flooding reported in Kwethluk. | One of a series of ice jams that formed on the Kuskokwim River near Akiachak, which diverted the Kusko's flow into the Kuskokuak Slough and overland, causing major flooding in Kwethluk. Released on 10 May. |
| 20240507164004 | Akiak | AK | Kuskokwim River | 05/05/2024 | 2024 | Break-up | 60.89428 | -161.26125 | - | - | released | Minor flooding reported around airfield on 5/4, moving slowly toward village as water levels increase c. 5/5. | Ice jammed just downstream of Akiak. |
| 20240507163454 | Tuluksak | AK | Kuskokwim River | 05/04/2024 | 2024 | Break-up | 61.06246 | -161.03747 | - | - | released | Minor flooding reported--backwater filled the Tuluksak River and started spilling over into town. Inundation of homes reported to have begun on 5/6. | Ice jammed in shallows just downstream of Tuluksak. |
| 20240507162059 | Lower Kalskag | AK | Kuskokwim River | 05/03/2024 | 2024 | Break-up | 61.442515 | -160.511063 | - | - | released | On 3 May, water levels fluctuated throughout the day. As of 8pm water was rising again, the lake at Lower Kalskag was rising, and water had reached the village via Mud Creek.
Minor flooding in Kalskag has cut off the community from the airstrip, surrounded the school, and come within a couple feet of the power plant. As of 9PM the powerplant was still running (5/3).
The jam released on 5/4 but briefly re-jammed on the island below Lower Kalsag. | An ice jam roughly 4 miles below Lower Kalskag is causing minor flooding in Kalskag. The ice jam at is being held by one large rotated original ice sheet. Water levels were at bankfull and overbank in low areas but the high wood was still dry. Rotated original large ice sheets similar to are above Coffee Bend and to a somewhat lesser degree in Coffee Bend. There is still ice at the Bluffs.
Ice is backed up to roughly 5 miles above Upper Kalskag. |
| 20240507161350 | Eagle | AK | Yukon River | 05/03/2024 | 2024 | Break-up | 64.794649 | -141.191313 | - | - | released | No flooding reported. | Brief ice jam reported at Eagle as the Yukon River broke up. Released the same day. |
| 20240507152812 | Lower Kalskag | AK | Kuskokwim River | 05/02/2024 | 2024 | Break-up | 61.42507 | -160.57146 | - | - | released | No flooding reported. | Ice jam reported near Birch Crossing (>90 degree southerly turn downstream of Lower Kalsag). Ice backed up past Aniak. Reported released on 5/3. |
| 20240430134427 | Ekwok | AK | Nushagak River | 04/28/2024 | 2024 | Break-up | 59.21897 | -157.64662 | - | - | released | No flooding reported by locals in Ekwok or New Stuyahok. | Jam reported near Dillingham by river observers. Location inferred from Planet imagery from 4/28. |
| 20240430134857 | Dillingham | AK | Nushagak River | 04/27/2024 | 2024 | Break-up | 58.93232 | -158.05273 | - | - | released | Lowland flooding readily apparently in imagery; no flooding reported in local communities. | Jam reported downstream of Ekwok by river observers. Location inferred from Planet and Sentinel imagery from 4/27. Released 5/2. |
| 20240430140400 | Salcha | AK | Tanana River | 04/25/2024 | 2024 | Break-up | 64.50972 | -147.0137 | - | - | released | Lowland flooding reported but no property damage. | FEOI observer reported the Tanana River jammed about a half mile upstream of the Tanana River Bridge near Salcha. Location inferred from 4/25 Planet imagery; released later on 4/25. |
| 20230530134024 | Nunam Iqua | AK | Yukon River | 05/28/2023 | 2023 | Break-up | 62.541733 | -164.865009 | - | - | released | Major flooding of Nunam Iqua--travel only possible in boats. | Ice jammed at Nunam Iqua. |
| 20230530133243 | Mountain Village | AK | Yukon River | 05/26/2023 | 2023 | Break-up | 62.489977 | -163.863466 | - | - | released | Moderate flooding reported in Emmonak including road to airport. | This could be a repositioning or re-jam or just a different view of the Mountain Village jam from 10/25, but the location is notably different. Jam reported to be blocking the southern mouth of the Yukon River and diverting most of the flow into the middle mouth. Locals expected flooding at Emmonak when this jam released; the release has not been confirmed, but flooding at Emmonak started on 27 May. |
| 20230525173532 | Pilot Station | AK | Yukon River | 05/25/2023 | 2023 | Break-up | 61.916721 | -162.922386 | - | - | released | Stage rise of 4' reported but no mention of flooding. | Jam reported below pilot station. Released the same day. |
| 20230530132845 | Mountain Village | AK | Yukon River | 05/25/2023 | 2023 | Break-up | 62.157518 | -163.958924 | - | - | released | Minor flooding in Mountain Village. | Ice jam on the Yukon River near 10-mile island downstream of Mountain Village. |
| 20230525172606 | - | AK | Colville River | 05/23/2023 | 2023 | Break-up | 70.053183 | -151.169628 | - | - | released | No flooding was reported. | Ice jam on the Colville River near Horseshoe Bend/Ocean Point. |
| 20230523163040 | Russian Mission | AK | Yukon River | 05/22/2023 | 2023 | Break-up | 61.582309 | -161.927521 | - | - | released | Major flooding in Russian Mission, including lower village and runway. | Position inferred from reports from Russian Mission. Breakup front moved past around 21 May but flow slowed significantly on 22 May and water is rising. Also likely responsible for flooding in Anvik, though they estimate another 8'+ rise would be needed to impact community. Jam below Russian Mission held until late 24 May when it was reported to release and flood waters began receding. Flooding reported to be "worst since 1989"--three cabins swept off their foundations. |
| 20230522014419 | Kobuk | AK | Kobuk River | 05/19/2023 | 2023 | Break-up | 66.906326 | -156.916465 | - | - | released | Minor flooding of lowlands and some roadways. | Ice jam on the Kobuk River near Kobuk. |
| 20230522014801 | Galena | AK | Yukon River | 05/19/2023 | 2023 | Break-up | 64.643951 | -156.615395 | - | - | released | Water reported out of bank above jam. | Ice jam around Fish Island, upstream of Galena, backing up to the confluence of the Yukon and Yuki Rivers. Water reported out of bank above the jam. Jam reported released (or at least part of it) 19 May. Upstream jam (around Nowitna River) holding. |
| 20230522013910 | Bethel | AK | Kuskokwim River | 05/19/2023 | 2023 | Break-up | 60.785093 | -161.730144 | - | - | released | Moderate flooding (lowlands, nearby roads) reported in Bethel. Flooding in Kwethluk likely exacerbated by this jam (though jam upstream at Akiachak is causing it). | Ice jam on the Kuskokwim River near Bethel. Released on 20 May. |
| 20230522013509 | Akiachak | AK | Kuskokwim River | 05/19/2023 | 2023 | Break-up | 60.863095 | -161.357671 | - | - | released | Major flooding in Kwethluk as full flow of Kuskokwim has been diverted into the nearby slough. | Ice jam on the Kuskokwim upstreak of Akiachak diverting water down the Kuskokuak Slough and overland into Kwethluk. Minor flooding also reported in Akiachak. Released on 20 May. |
| 20230518172100 | Buckland | AK | Buckland River | 05/17/2023 | 2023 | Break-up | 65.968088 | -161.129047 | - | - | released | Major flooding in Buckland. | Ice jam reported ~1 mile upstream of Buckland. As of 18 May, observers note ice around Buckland is breaking up, but ice has not come down from upstream yet. River came up more than 15' on 16 May. Reports that this jam is diverting water into Buckland in addition to the jams below down backing up the river at Buckland. Jam release on 19 May, though it is reported ~20% of town is still flooded. |
| 20230518170942 | Ruby | AK | Yukon River | 05/17/2023 | 2023 | Break-up | 64.881829 | -154.961881 | - | - | released | Extensive flooding reaching back to Tanana. | Ice jam reported near Horner Hot Springs near Ruby, AK, on the Yukon River near breakup front. Associated imagery from RFC: https://www.weather.gov/aprfc/geoPhoto?photoMeta=mid-yukon-river-watch-may-17-2023
Last of the Middle Yukon to release; break-up announced on 21 May. |
| 20230518171447 | Lower Kalskag | AK | Kuskokwim River | 05/17/2023 | 2023 | Break-up | 61.235945 | -160.754898 | - | - | released | Minor flooding reported along river and in Upper and Lower Kalskag. | Ice jam reported below Lower Kalskag on the Kuskokwim. Location very approximate. |
| 20230518172543 | Buckland | AK | Buckland River | 05/16/2023 | 2023 | Break-up | 66.005531 | -161.162349 | - | - | released | Major flooding in Buckland. As of 18 May, "Observer reports water to their front door. Water came up significantly overnight. The whole town is covered in water, and travel is by boat only in town right now. Ice has yet to come downriver." | Ice jam on first bend below Buckland. Likely cause of dramatic stage rise near town (reportedly 15' on 16 May and ~1'/day through 18 May). Ice backed up to town as of 17 May. |
| 20230516143043 | Napaimiut | AK | Kuskokwim River | 05/15/2023 | 2023 | Break-up | 61.56623 | -158.85099 | - | - | released | Airport flooded--4' of water in hangar. Nearby houses surrounded but community is not yet inundated. | Break-up jam between Chuathbaluk and Napaimute. |
| 20230516141743 | McGrath | AK | Kuskokwim River | 05/14/2023 | 2023 | Break-up | 62.96092 | -155.61066 | - | - | released | Reported that ~1 mile of Cranberry Ridge Road is washed out due to flooding associated with jamming. No other flooding/damages reported. | Several break-up jam occurred around McGrath, AK. |
| 20230516142336 | Crooked Creek | AK | Kuskokwim River | 05/13/2023 | 2023 | Break-up | 61.84238 | -158.12462 | - | - | released | (Near?) record flooding reported, exceeding previous large flood event in 2011. Levels reported rose 16' on 13 May before dropping 10' on 14 May. | Break-up jam below Crooked Creek, AK. Very approximate location due to cloud cover. |