Yearly Summaries

Water year

River	Number events	Jam Type
Kankakee River	7	Freeze-up
Rock River	7	Freeze-up
Des Plaines River	3	Freeze-up
Mad River	2	Break-up
Ausable River	2	Break-up
Allegheny River	2	Break-up
MIssouri River	2	Freeze-up
Fox River	2	Freeze-up
Des Moines River	1	Freeze-up
Swatara Creek	1	Break-up
Meduxnekeag River	1	Break-up
Delaware River	1	Freeze-up
Grand River	1	Break-up
West Canada Creek	1	Freeze-up
Saranac River	1	Break-up
Susquehanna River	1	Break-up
Chagrin River	1	Break-up
Great Chazy River	1	Break-up
Ammonoosuc River	1	Break-up
Kishwaukee River	1	Freeze-up
Salmon	1	Break-up
Hudson River	1	Break-up
Salmon River	1	Break-up
Lemhi River	1	Break-up
Piscataquis River	1	Break-up
Platte River	1	Break-up
Mohawk River	1	Break-up
Cheat River	1	Break-up
Passumpsic River	1	Break-up
Kenai River	1	Freeze-up
Platte River	1	Freeze-up
Wasilla Creek	1	Freeze-up
East Branch Passumpsic River	1	Break-up
Pleasant RIver	1	Break-up

1

State	Jam type	Number events
IL	Freeze-up	16
NY	Break-up	7
PA	Break-up	4
VT	Break-up	4
ME	Break-up	3
NE	Freeze-up	3
IN	Freeze-up	3
ID	Break-up	2
AK	Freeze-up	2
MI	Break-up	1
WV	Break-up	1
NY	Freeze-up	1
NJ	Freeze-up	1
WI	Freeze-up	1
NE	Break-up	1
OH	Break-up	1
NH	Break-up	1
IA	Freeze-up	1

State	Number Events
IL	16
NY	8
NE	4
PA	4
VT	4
IN	3
ME	3
AK	2
ID	2
MI	1
WI	1
OH	1
WV	1
IA	1
NJ	1
NH	1

River	Number Events
Rock River	7
Kankakee River	7
Des Plaines River	3
Ausable River	2
Platte River	2
Mad River	2
MIssouri River	2
Fox River	2
Allegheny River	2
Chagrin River	1
Passumpsic River	1
Piscataquis River	1
Grand River	1
Salmon River	1
Lemhi River	1

Jam Dates	Number Events
04/01/1969	85
01/19/1996	79
01/22/1959	75
01/23/1957	72
03/11/1992	61
02/08/1965	54
03/12/1936	52
03/19/1969	49
02/09/1996	45
03/10/1989	42
03/14/2003	40
03/06/1979	40
02/11/1981	40
03/07/1979	39
03/17/2003	39
03/05/1964	39
02/14/1948	35
01/24/1999	35
02/04/1963	35
03/09/1942	35
02/14/1971	34
03/19/1960	34
02/08/1996	33
02/25/1986	32
02/21/2014	31
03/21/1960	29
02/13/1971	29
01/21/1959	28
01/30/1968	27
02/01/1982	27
02/13/1966	27
03/09/2004	26
01/25/2010	26
03/10/2014	26
01/09/1978	26
01/26/1978	26
01/12/2018	26
02/24/1986	26
02/08/1941	25
02/18/2011	25
02/06/1963	25
04/03/1959	25
04/01/1965	25
03/13/1936	25
02/05/1963	25
02/26/1986	24
03/07/2014	24
02/20/1994	24
03/18/1969	24
01/28/1994	24
03/21/1978	24
02/26/1961	24
02/12/2009	23
02/01/1996	23
03/17/1985	23
03/15/2003	23
02/12/1981	23
03/14/2007	23
03/16/2003	23
03/09/1946	22
03/10/1955	22
02/28/2000	22
03/13/1972	22
03/11/1989	22
02/17/2011	22
03/27/1960	21
01/13/2018	21
03/09/1989	21
02/19/1971	21
02/04/2019	21
03/08/2004	21
02/04/1982	21
03/22/1960	21
03/10/2004	21
12/24/2004	21
02/25/1965	21
02/04/1970	20
03/20/1956	20
02/27/1936	20
01/01/1952	20
03/21/2003	20
01/12/2014	20
02/22/1945	20
03/03/1934	20
01/10/1935	19
03/10/1996	19
03/03/1994	19
02/20/1971	19
01/09/1935	19
01/31/2013	19
03/15/2001	19
03/18/1959	19
03/12/1989	19
03/15/2007	19
02/16/1971	19
03/09/2014	19
03/04/1934	19
03/20/1997	19
01/22/2005	18
01/24/2019	18

Jam date	Jam type	Number Events
03/09/2026	Break-up	4
01/19/2026	Freeze-up	4
02/20/2026	Break-up	3
01/02/2026	Freeze-up	3
03/08/2026	Break-up	3
01/17/2026	Freeze-up	3
01/18/2026	Freeze-up	3
03/18/2026	Break-up	2
01/22/2026	Freeze-up	2
12/20/2025	Break-up	2
01/26/2026	Freeze-up	2
12/15/2025	Freeze-up	2
01/07/2026	Break-up	1
01/20/2026	Freeze-up	1
03/27/2026	Break-up	1
01/24/2026	Break-up	1
03/11/2026	Break-up	1
12/14/2026	Freeze-up	1
01/21/2026	Freeze-up	1
02/23/2026	Break-up	1
12/14/2025	Freeze-up	1
01/28/2026	Break-up	1
02/18/2026	Break-up	1
12/29/2025	Freeze-up	1
01/25/2026	Freeze-up	1
01/23/2026	Freeze-up	1
03/19/2026	Break-up	1
02/21/2026	Break-up	1
03/10/2026	Break-up	1
12/16/2025	Freeze-up	1
12/04/2025	Freeze-up	1
02/09/2026	Break-up	1

Month	Number Events
September	0
October	0
November	0
December	9
January	24
February	7
March	13
April	0
May	0
June	0
July	0
August	0