Data is updated every year about October/November time period



Black Rock Dam, Branch Brook
Peak Project Releases
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
Release (cfs)
14 Sep 1971 494
19 Mar 1972 411
07 Dec 1972 723 1
22 Dec 1973 555
28 Sep 1975 795 1
10 Aug 1976 590
27 Sep 1977 500 1
28 Jan 1978 705
26 Jan 1979 750
  
24 Mar 1980 740
22 Feb 1981 725
08 Jun 1982 805
22 Mar 1983 755
05 Jun 1984 683
29 Sep 1985 398
28 Jan 1986 538
07 Apr 1987 766
03 Feb 1988 139
12 May 1989 551
  
23 Oct 1989 540
24 Oct 1990 321
06 Jun 1992 208
30 Mar 1993 706
23 Aug 1994 599
09 Mar 1995 334
14 Nov 1995 620
23 Oct 1996 559
10 Mar 1998 456
17 Sep 1999 578
  
07 Jun 2000 285
30 Mar 2001 366
07 Jun 2002 288
03 Jun 2003 310
29 Oct 2003 531
29 Mar 2005 587
15 May 2006 645
20 Apr 2007 505
05 Mar 2008 472
31 Jul 2009 346
  
31 Mar 2010 641
31 Aug 2011 745
09 Dec 2011 454
15 Jun 2013 595
01 May 2014 591
04 Apr 2015 321
25 Feb 2016 307
08 Apr 2017 294
13 Sep 2018 402
22 Dec 2018 668
  
15 Dec 2019 663
03 Sep 2021 512

Notes:
1.    Estimated Release