Data is updated every year about October/November time period



Black Rock Dam, Branch Brook
Peak Pool Levels
by Water Year
(1971 - Present)
Drainage Area:  20 sq. miles
Normal Pool:  27 ft.
Gate Invert Elev.:  410 ft. NGVD
1" Runoff =   1,067 ac-ft
Storage at Spillway Crest:   7.8 in. / 8,450 ac-ft



Date
Annual Peak
Pool Level (ft)
Storage Utilized
Inches Acre-Feet Percent
14 Sep 1971 35.0 0.2 232 3
18 Mar 1972 52.0 1.0 1,040 12
04 Feb 1973 65.6 2.0 2,125 25
22 Dec 1973 78.5 3.3 3,542 42
28 Sep 1975 71.0 2.2 2,427 29
29 Jan 1976 61.9 1.6 1,786 21
14 Mar 1977 48.1 0.7 801 9
27 Jan 1978 57.7 1.3 1,440 17
08 Mar 1979 78.7 3.3 3,567 42
     
23 Mar 1980 68.7 2.2 2,435 29
22 Feb 1981 59.0 1.4 1,546 18
07 Jun 1982 84.5 4.0 4,318 51
22 Mar 1983 65.5 1.9 2,116 25
03 Jun 1984 93.4 5.2 5,604 66
28 Sep 1985 48.0 0.7 795 9
28 Jan 1986 63.1 1.7 1,895 22
06 Apr 1987 79.0 3.3 3,605 43
03 Feb 1988 28.8 0.0 45 1
21 Nov 1988 46.5 0.7 717 8
     
21 Oct 1989 75.0 2.2 2,375 28
05 Mar 1991 34.5 0.2 214 3
07 Jun 1992 32.6 0.1 155 2
29 Mar 1993 56.5 1.2 1,349 16
22 Aug 1994 45.7 0.6 676 8
09 Mar 1995 33.5 0.2 182 2
28 Jan 1996 57.6 1.3 1,433 17
21 Oct 1996 65.1 1.9 2,083 25
10 Mar 1998 41.9 0.5 496 6
17 Sep 1999 51.7 0.9 1,022 12
     
07 Jun 2000 35.4 0.2 247 3
31 Mar 2001 42.2 0.5 507 6
07 Jun 2002 31.5 0.1 121 1
22 Mar 2003 42.5 0.5 524 6
29 Oct 2003 40.6 0.4 438 5
03 Apr 2005 44.7 0.6 630 7
13 May 2006 61.6 1.6 1,750 21
17 Apr 2007 80.5 3.5 3,791 45
14 Feb 2008 57.4 1.3 1,417 16
31 Jul 2009 39.4 0.4 390 5
     
31 Mar 2010 63.0 1.8 1,855 22
29 Aug 2011 94.8 5.4 5,821 69
08 Dec 2011 43.0 0.5 542 6
14 Jun 2013 53.4 1.0 1,129 13
01 May 2014 52.8 1.0 1,092 13
10 Dec 2014 36.6 0.3 284 3
25 Feb 2016 36.5 0.3 282 3
07 Apr 2017 31.9 0.1 132 2
13 Jan 2018 42.0 0.5 497 6
22 Dec 2018 59.9 1.5 1,616 19
     
15 Dec 2019 53.0 1.0 1,103 13
03 Sep 2021 72.8 4.0 2,869 34