Largest Reservoirs in Wisconsin

Wisconsin has 958 dams with recorded storage capacity. The largest is Menasha Lock And Dam with 2,430,000 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	Menasha Lock And Dam	Winnebago	2,430,000	16	Flood Risk Reduction	1937
2	Neenah	Winnebago	1,100,000	15	Flood Risk Reduction	1881
3	Mississippi River Lock And Dam 4	Wabasha	878,000	42	Navigation	1935
4	Petenwell	Juneau	530,000	50	Hydroelectric	1949
5	Mississippi River Lock And Dam 9	Allamakee	470,000	46	Navigation	1937
6	Mississippi River Lock And Dam 8	Houston	260,000	42	Navigation	1937
7	Turtle-flambeau Detached Dike 9	Iron	239,000	10	Hydroelectric
8	Chippewa Reservoir	Sawyer	230,000	45	Hydroelectric	1923
9	Prairie Du Sac	Sauk	193,200	50	Hydroelectric	1914
10	Mississippi River Lock And Dam 6	Winona	180,000	40	Navigation	1936
11	Castle Rock	Adams	175,000	38	Hydroelectric	1950
12	Minocqua	Oneida	166,276	9	Hydroelectric	1909
13	Mendota Locks	Dane	160,000	16	Navigation	1849
14	Dubay	Portage	128,800	40	Hydroelectric	1942
15	Indianford	Rock	107,000	13	Recreation	1932
16	Burnt Rollways	Oneida	103,879	16	Hydroelectric	1907
17	Eau Pleine	Marathon	98,140	45	Hydroelectric	1937
18	Twin Lakes	Vilas	93,526	10	Hydroelectric	1908
19	Rest Lake	Vilas	68,000	25	Recreation	1925
20	Willow	Oneida	67,126	35	Hydroelectric	1927
21	Long-on-deerskin	Vilas	60,859	10	Hydroelectric	1908
22	Upper Beaver Dam	Dodge	57,000	20	Recreation	1840
23	Eau Galle Dam	Pierce	56,900	127	Flood Risk Reduction	1968
24	Wissota North Saddle Dike	Chippewa	56,000	79	Hydroelectric	1917
25	Billy Boy	Sawyer	53,600	13	Recreation	1936
26	Lake Waubesa	Dane	50,000	10	Navigation	1938
27	South Pelican	Oneida	49,931	8	Hydroelectric	1908
28	Lac Vieux Desert	Vilas	49,173	9	Hydroelectric	1907
29	Flambeau	Rusk	47,167	92	Hydroelectric	1951
30	Sawyer Dike	Oneida	46,006	20	Hydroelectric	1935
31	Callahan Dike	Chippewa	46,000	40	Hydroelectric	1907
32	Cedar Lake	Barron	45,000	21	Recreation	1874
33	Chequamegon Waters	Taylor	45,000	22	Recreation	1967
34	Rice	Lincoln	44,123	19	Hydroelectric	1912
35	Otter Rapids	Vilas	42,280	20	Hydroelectric	1907
36	Upper Green Lake	Green Lake	40,000	8	Recreation	1869
37	Lake Geneva	Walworth	40,000	14	Recreation	1836
38	Bear Lake	Barron	38,120	22	Recreation	1880
39	Gile	Iron	38,000	30	Other	1941
40	Totagatic	Sawyer	38,000	20	Recreation	1936
41	Pewaukee	Waukesha	36,900	14	Recreation	1842
42	Kilbourn	Columbia	36,000	61	Hydroelectric	1909
43	Long Lake	Washburn	35,000	15	Recreation	1913
44	Chetek	Barron	34,160	16	Hydroelectric	1865
45	Big St Germain	Vilas	33,655	7	Hydroelectric	1923
46	Lake Mills	Jefferson	28,330	17	Recreation	1865
47	Saint Croix Falls	Polk	27,500	64	Hydroelectric	1905
48	Moose Lake 1	Sawyer	27,500	23	Recreation	1897
49	North Dike At Stevens Point	Portage	27,000	9	Hydroelectric	1846
50	Sugar Camp	Oneida	24,793	10	Hydroelectric	1908

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