Data is updated every year about October/November time period



Hopkinton Dam, Contoocook River
Peak Pool Levels
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
Pool Level (ft)
Storage Utilized
Inches Acre-Feet Percent
08 Oct 1962 391.3 0.4 8,153 5
17 Apr 1964 395.8 0.7 14,732 10
17 Apr 1965 384.5 0.1 1,792 1
25 Mar 1966 387.5 0.2 3,915 3
05 Apr 1967 394.2 0.6 12,060 8
24 Mar 1968 402.0 1 1.4 34,430 21
20 Apr 1969 405.0 1 3.0 76,425 47
     
04 Apr 1970 391.0 0.4 7,790 5
14 Apr 1971 389.0 0.3 5,350 4
21 Apr 1972 390.5 0.3 7,120 5
05 Apr 1973 396.4 0.8 15,794 12
23 Dec 1973 393.9 0.6 11,610 8
04 Apr 1975 387.9 0.2 4,247 3
02 Apr 1976 389.5 0.3 5,900 4
19 Mar 1977 402.2 1 1.4 34,450 21
11 Jan 1978 388.0 0.2 4,330 3
11 Mar 1979 402.5 1 1.4 33,482 21
     
23 Mar 1980 392.5 0.5 9,675 7
28 Feb 1981 398.7 1.0 20,078 12
05 Apr 1982 392.7 0.5 9,945 7
23 Mar 1983 401.7 1 1.3 33,065 20
02 Jun 1984 407.5 1 4.0 100,525 62
15 Mar 1985 389.1 0.3 5,460 3
21 Mar 1986 398.5 1.0 19,672 13
08 Apr 1987 415.8 1 6.4 154,206 95
29 Mar 1988 394.5 0.6 12,525 8
11 Apr 1989 393.5 0.5 11,050 8
     
22 Mar 1990 397.2 0.8 17,212 11
22 Aug 1991 394.6 0.6 12,680 9
12 Mar 1992 389.8 0.3 6,230 4
14 Apr 1993 404.2 1 1.9 46,957 29
08 Apr 1994 389.9 0.3 6,340 4
25 Dec 1994 390.0 0.3 6,450 4
19 Apr 1996 403.3 1 1.5 36,950 23
23 Oct 1996 405.0 1 2.1 52,426 32
19 Jun 1998 403.3 1 1.4 36,302 22
17 Sep 1999 391.0 0.4 7,763 5
     
25 Apr 2000 391.8 0.4 8,770 5
25 Apr 2001 399.8 1.1 22,356 15
14 May 2002 387.6 0.2 3,990 3
31 Mar 2003 404.6 1 2.1 54,112 33
04 Apr 2004 402.5 1 1.5 36,349 22
05 Apr 2005 404.0 1 1.8 44,775 28
17 May 2006 407.5 1 4.2 99,450 64
18 Apr 2007 407.5 1 4.0 95,350 61
09 Mar 2008 390.7 0.3 7,388 5
14 Dec 2008 391.5 0.4 8,347 5
     
01 Apr 2010 406.3 1 3.5 83,470 54
13 Mar 2011 399.4 0.9 21,425 14
08 Dec 2011 389.1 0.2 5,427 3
11 Jun 2013 388.8 0.2 5,187 3
03 Apr 2014 393.6 0.5 11,134 8
24 Oct 2014 389.5 0.2 5,845 3
26 Feb 2016 388.5 0.2 4,850 3
11 Apr 2017 388.3 0.2 4,616 3
16 Jan 2018 394.0 0.5 11,806 17
10 Nov 2018 398.5 0.8 19,565 28
     
15 Dec 2019 386.8 0.1 3,346 5
28 Dec 2020 394.0 0.5 11,708 17

Notes:
1.    Combined storage event with Everett Dam
When pool levels exceed 401.0 at Hopkinton, storage is combined at Hopkinton-Everett