Data is updated every year about October/November time period



Colebrook Dam, West Branch Farmington River
Peak Pool Levels
by Water Year
(1969 - Present)
Drainage Area:  118 sq. miles
Normal Pool:  708 ft. NGVD (714.5 ft. Spring)
Gate Invert Elev.:  575 ft. NGVD
1" Runoff =   6,293 ac-ft
Storage at Spillway Crest:   8.0 in. / 50,200 ac-ft



Date
Annual Peak
Pool Level (ft)
Storage Utilized
Inches Acre-Feet Percent
1969        
     
20 May 1970 718.0 1.2 7,860 16
17 May 1971 715.0 0.9 5,400 11
05 Jul 1972 739.8 4.4 27,504 55
07 Apr 1973 719.3 1.4 8,926 18
14 May 1974 718.7 1.3 8,434 17
05 Apr 1975 721.1 1.7 10,446 21
30 Jan 1976 717.9 1.2 7,778 15
26 Apr 1977 722.0 1.8 11,220 22
11 Jan 1978 718.8 1.4 8,516 17
31 May 1979 729.6 2.8 17,848 36
     
16 Apr 1980 729.8 2.9 18,024 36
22 May 1981 701.1 BELOW FLOOD CONTROL POOL
10 Jun 1982 734.2 3.5 22,064 44
26 Apr 1983 747.1 5.5 34,884 69
04 Jun 1984 757.5 7.3 46,150 92
05 Aug 1985 676.2 BELOW FLOOD CONTROL POOL
21 Nov 1985 693.9 BELOW FLOOD CONTROL POOL
11 Apr 1987 732.8 3.3 20,776 41
28 May 1988 705.2 BELOW FLOOD CONTROL POOL
18 May 1989 722.7 1.9 11,822 24
     
06 Apr 1990 719.9 1.5 9,418 19
28 Mar 1991 713.8 0.7 4,464 9
12 Jun 1992 701.4 BELOW FLOOD CONTROL POOL
19 Apr 1993 735.0 3.6 22,800 45
18 Apr 1994 718.0 1.2 7,860 16
20 Mar 1995 706.3 BELOW FLOOD CONTROL POOL
20 Apr 1996 721.8 1.8 11,014 22
05 May 1997 716.5 1.1 6,638 13
13 May 1998 720.7 1.6 10,068 20
25 May 1999 714.5 0.8 5,026 10
     
12 Jun 2000 724.9 2.2 13,680 27
18 Apr 2001 718.2 1.3 8,024 16
19 Jun 2002 684.5 BELOW FLOOD CONTROL POOL
24 Jun 2003 715.7 0.9 5,933 12
05 May 2004 712.5 0.5 3,411 7
11 Apr 2005 719.7 1.5 9,000 19
21 Jan 2006 726.7 2.5 15,500 31
23 Apr 2007 739.9 4.4 27,602 55
11 Mar 2008 720.4 1.6 9,844 20
30 Dec 2008 714.4 0.8 4,940 10
     
02 Apr 2010 725.7 2.3 14,413 29
12 Sep 2011 735.1 3.7 22,900 45
04 Oct 2011 728.4 2.7 16,818 33
17 Jun 2013 736.9 3.9 24,662 49
04 May 2014 719.1 1.4 8,770 18
23 Apr 2015 715.1 0.9 5,466 11
16 May 2016 702.0 BELOW FLOOD CONTROL POOL
12 Apr 2017 715.9 1.0 6,154 12
18 Apr 2018 718.3 1.3 8,098 16
22 Apr 2019 715.9 1.0 6,102 12
     
05 May 2020 716.6 1.1 6,625 13
19 Jul 2021 718.2 1.3 8,049 16

Notes:
1.    Below Flood Control Pool