Mansfield Hollow Dam, Natchaug River
Peak Pool Levels
by Water Year
(1952 - Present)
Drainage Area:  159 sq. miles
Normal Pool:  16.5 ft. (Summer), 15 ft. (Winter)
Gate Invert Elev.:  195 ft. NGVD
1" Runoff =   8,480 ac-ft
Storage at Spillway Crest:   5.8 in. / 52,000 ac-ft

Date	Annual Peak Pool Level (ft)	Storage Utilized
		Inches	Acre-Feet	Percent
02 Jun 1952	14.8	0.0	0	0
26 Jan 1953	19.0	0.1	1,180	2
13 Sep 1954	31.3	1.1	9,440	19
22 Aug 1955	51.8	3.8	31,920	65
18 Oct 1955	37.2	1.7	14,640	30
26 Jan 1957	22.5	0.4	3,145	6
29 Jan 1958	22.8	0.4	3,328	7
05 Apr 1959	29.8	1.0	8,240	17
01 Apr 1960	17.5	0.1	440	1
27 Feb 1961	26.0	0.6	5,430	11
02 Apr 1962	16.1	0.0	0	0
09 Oct 1962	23.0	0.4	3,450	7
01 Feb 1964	15.5	0.0	0	0
15 Apr 1965	18.3	0.1	830	2
26 Mar 1966	19.5	0.2	1,445	3
28 May 1967	29.8	1.0	8,240	17
20 Mar 1968	37.6	1.8	15,020	31
27 Mar 1969	25.7	0.6	5,226	11
12 Feb 1970	36.0	1.6	13,500	27
13 Sep 1971	18.3	0.1	830	2
04 Mar 1972	34.3	1.4	11,970	24
04 Feb 1973	30.3	1.0	8,640	18
22 Dec 1973	31.5	1.1	9,600	20
06 Jun 1975	20.1	0.2	1,759	4
29 Jan 1976	34.4	1.4	12,060	25
15 Mar 1977	25.1	0.6	4,818	10
28 Jan 1978	39.8	2.0	17,240	35
27 Jan 1979	44.9	2.7	22,880	47
23 Mar 1980	37.2	1.7	14,640	30
26 Feb 1981	34.0	1.4	11,700	24
08 Jun 1982	52.6	3.9	33,100	67
26 Apr 1983	41.6	2.3	19,160	39
04 Jun 1984	48.7	3.3	27,610	56
14 Jun 1985	19.9	0.2	1,657	3
28 Jan 1986	30.2	1.0	8,560	17
07 Apr 1987	46.8	3.0	25,200	51
28 Mar 1988	22.9	0.4	3,389	7
15 Aug 1989	32.3	1.2	10,240	21
23 Oct 1989	35.0	1.5	12,600	26
15 Oct 1990	24.7	0.5	4,549	9
25 Nov 1991	24.6	0.5	4,482	9
02 Apr 1993	36.5	1.6	13,975	28
03 Feb 1994	29.4	0.9	7,920	16
10 Mar 1995	23.5	0.4	3,765	8
18 Apr 1996	37.3	1.7	14,773	30
19 Dec 1996	23.0	0.4	3,432	7
11 Mar 1998	42.6	2.4	20,260	41
20 Jan 1999	24.7	0.5	4,549	9
23 Apr 2000	29.4	0.9	7,936	16
18 Jun 2001	28.4	0.8	7,165	15
14 May 2002	21.8	0.3	2,718	6
27 May 2003	25.0	0.6	4,770	10
15 Apr 2004	30.2	1.0	8,560	17
04 Apr 2005	27.8	0.8	6,800	14
17 Oct 2005	43.7	2.5	21,750	44
18 Apr 2007	38.0	1.8	15,400	31
10 Mar 2008	32.7	1.2	10,560	21
14 Dec 2008	37.4	1.7	14,830	30
01 Apr 2010	45.3	2.8	23,360	48
08 Mar 2011	38.2	1.8	15,600	31
09 Dec 2011	22.0	0.3	2,840	6
09 Jun 2013	29.1	0.9	7,720	15
01 Apr 2014	30.1	1.0	8,496	17
22 Apr 2015	22.3	0.4	2,993	6
26 Feb 2016	21.3	0.3	2,411	5
02 Apr 2017	22.4	0.4	3,090	6
14 Jan 2018	28.1	0.8	9,722	19
26 Jan 2019	29.4	0.9	10,700	21
15 Dec 2019	22.4	0.4	5,928	11
11 Jul 2021	40.9	2.2	21,216	41