Data is updated every year about October/November time period



Surry Mountain Dam, Ashuelot River
Peak Pool Levels
by Water Year
(1943 - Present)
Drainage Area:  100 sq. miles
Normal Pool:  15 ft. (Summer), 18 ft. (Winter)
Gate Invert Elev.:  485 ft. NGVD
1" Runoff =   5,333 ac-ft
Storage at Spillway Crest:   5.9 in. / 31,694 ac-ft



Date
Annual Peak
Pool Level (ft)
Storage Utilized
Inches Acre-Feet Percent
1943 1 25.8 0.7 3,801 12
27 Apr 1944 40.2 2.2 11,558 37
22 Mar 1945 38.7 2.0 10,618 34
12 Mar 1946 31.3 1.2 6,422 21
17 Apr 1947 41.5 2.3 12,400 40
29 Mar 1948 57.6 4.7 24,831 80
08 Jan 1949 36.7 1.8 9,410 30
     
07 Apr 1950 30.1 1.1 5,812 19
10 Apr 1951 50.3 3.5 18,739 60
16 Apr 1952 44.0 2.6 14,086 45
02 Apr 1953 53.8 4.0 21,569 69
21 Apr 1954 28.5 0.9 5,032 16
19 Apr 1955 20.8 0.3 1,814 6
04 May 1956 50.6 3.6 18,975 61
25 Jan 1957 21.0 0.4 1,885 6
26 Apr 1958 43.5 2.6 13,743 44
07 Apr 1959 36.5 1.7 9,292 30
     
07 Apr 1960 54.8 4.2 22,409 72
28 Apr 1961 24.2 0.6 3,124 10
11 Apr 1962 40.8 2.2 11,944 38
06 Apr 1963 31.3 1.3 6,681 21
16 Apr 1964 32.9 1.4 7,265 23
18 Apr 1965 26.0 0.7 3,887 12
27 Mar 1966 23.0 0.5 2,641 8
30 May 1967 31.0 1.2 6,266 20
25 Mar 1968 44.0 2.6 14,086 45
25 Apr 1969 55.5 4.3 23,006 74
     
12 Apr 1970 26.0 0.7 3,887 12
16 Apr 1971 22.5 0.5 2,448 8
21 Apr 1972 33.0 1.4 7,318 23
03 Jul 1973 31.6 1.2 6,577 21
24 Dec 1973 43.5 2.6 13,743 44
21 Apr 1975 25.0 0.6 3,124 10
03 Apr 1976 36.4 1.7 9,175 29
16 Mar 1977 45.5 2.8 15,144 49
10 Jan 1978 29.0 1.0 5,270 17
12 Mar 1979 49.6 3.4 18,194 58
     
14 Apr 1980 36.1 1.7 9,058 29
28 Feb 1981 34.1 1.5 7,921 25
22 Apr 1982 44.0 2.6 14,086 45
23 Mar 1983 34.8 1.6 8,314 27
04 Jun 1984 61.4 5.3 28,274 91
14 Mar 1985 24.1 0.6 3,083 10
22 Mar 1986 37.5 1.9 9,886 32
07 Apr 1987 66.1 SPILLWAY DISCHARGE
29 Mar 1988 31.0 1.2 6,266 20
09 Apr 1989 34.1 1.5 7,921 25
     
24 Mar 1990 47.6 3.1 16,676 53
26 Dec 1990 24.7 0.6 3,332 11
13 Mar 1992 26.1 0.7 3,932 13
19 Apr 1993 43.9 2.6 14,017 45
18 Apr 1994 42.3 2.4 12,930 41
18 Jan 1995 40.9 2.3 12,008 38
31 Oct 1995 36.9 1.8 9,533 31
22 Apr 1997 30.2 1.1 5,877 19
04 Apr 1998 40.5 2.2 11,745 38
19 Sep 1999 27.8 0.9 4,720 15
     
11 Apr 2000 23.7 0.5 2,933 9
26 Apr 2001 46.6 3.0 15,909 51
03 Apr 2002 24.6 0.6 3,290 11
01 Apr 2003 39.4 2.1 11,047 35
04 Apr 2004 38.0 1.9 10,169 33
06 Apr 2005 46.9 3.0 15,950 51
17 Oct 2005 63.5 5.7 30,200 96
23 Apr 2007 49.6 3.4 18,194 58
14 Apr 2008 35.0 1.6 8,426 27
03 Aug 2009 36.5 1.8 9,310 29
     
03 Apr 2010 51.5 3.7 19,666 62
12 Mar 2011 39.0 2.0 10,800 34
31 May 2012 31.8 1.2 6,692 21
05 Jul 2013 43.3 2.5 13,626 43
18 Apr 2014 32.3 1.3 6,966 22
26 Dec 2014 24.8 0.6 3,356 11
27 Feb 2016 33.7 1.4 7,717 24
27 Feb 2017 31.0 1.2 6,241 20
16 Jan 2018 42.3 2.4 12,933 41
07 Nov 2018 41.3 2.3 12,265 39
     
16 Dec 2019 24.1 0.6 3,069 10
02 Aug 2021 42.2 2.4 12,867 41

Notes:
1.    Missing Date of Peak Pool
2.    Spillway Discharge