Data is updated every year about October/November time period



Hopkinton Dam, Contoocook River
Peak Project Releases
by Water Year
(1963 - Present)
Drainage Area (gross):  426 sq. miles
Drainage Area (net):  382 sq. miles
Normal Pool:  380 ft. NGVD(Summer), 382 ft. NGVD(Winter)
Gate Invert Elev.:  366 ft. NGVD
1" Runoff =   20,373 ac-ft
Storage at Spillway Crest:   6.5 in. / 70,100 ac-ft


Date Annual Peak
Release (cfs)
03 Apr 1963 5,000
14 Apr 1964 4,180
17 Apr 1965 2,140
26 Mar 1966 2,600
05 Apr 1967 3,820
29 Mar 1968 4,470
24 Apr 1969 5,260
  
13 Feb 1970 4,200
15 Apr 1971 3,890
21 Apr 1972 5,140
06 Apr 1973 4,640
24 Dec 1973 5,160
05 Apr 1975 3,560
03 Apr 1976 3,750
17 Mar 1977 6,620
19 Oct 1977 3,710
14 Mar 1979 5,380
  
24 Mar 1980 4,890
02 Mar 1981 4,060
21 Apr 1982 4,550
24 Mar 1983 4,760
10 Apr 1984 4,490
15 Mar 1985 2,410
21 Mar 1986 4,290
08 Apr 1987 7,530
31 Mar 1988 3,160
04 May 1989 3,470
  
22 Mar 1990 4,830
06 Mar 1991 3,320
25 Nov 1991 3,311
21 Apr 1993 5,227
09 Apr 1994 4,524
26 Dec 1994 4,641
20 Apr 1996 5,530
24 Oct 1996 4,711
12 Mar 1998 4,861
18 Sep 1999 4,623
  
25 Apr 2000 4,413
15 Apr 2001 5,709
14 May 2002 3,046
02 Apr 2003 5,966
05 Apr 2004 5,539
06 Apr 2005 6,160
20 Oct 2005 5,920
30 Apr 2007 5,370
14 Apr 2008 4,860
08 Apr 2009 4,130
  
28 Mar 2010 6,000
17 Mar 2011 5,650
09 Dec 2011 4,370
04 Jul 2013 4,680
03 Apr 2014 4,960
12 Dec 2014 4,730
26 Feb 2016 4,220
12 Apr 2017 4,523
02 Nov 2017 5,170
11 Nov 2018 4,735
  
16 Dec 2019 4,780
21 Jul 2021 5,117