Water Supply Dams in Iowa

Iowa has 49 water supply dams, of which 2 carry a high hazard classification. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area.

#	Dam	County	Height (ft)	Hazard	Condition	Year
1	Maffitt Reservoir Dam	Dallas	79	High	Satisfactory	1944
2	West Lake Dam	Clarke	58	Significant	Satisfactory	1935
3	North Woods Lake Dam	Decatur	57	Significant	Satisfactory	1993
4	Pheasant Ridge Dam	Dallas	54	Significant	Satisfactory	1972
5	Afton Reservoir Dam	Union	51	Significant	Satisfactory	1936
6	Cedar Creek Dam	Madison	50	Significant	Satisfactory	1939
7	Upper Centerville Reservoir Dam	Appanoose	48	Significant	Fair	1912
8	Swine Graphics Dam #2	Clarke	47	Low	Not assessed	2005
9	Swine Graphics #1	Clarke	44	Low	Not assessed	2000
10	Bedford Water Supply Dam	Taylor	44	Significant	Fair	1969
11	Lake Fisher Dam	Davis	43	Significant	Satisfactory	1937
12	Greenfield Reservoir Dam	Adair	42	High	Satisfactory	1979
13	East Lake Dam	Clarke	41	Significant	Satisfactory	1915
14	Grand River Cattle Dam	Decatur	41	Low	Not assessed	2007
15	Fairfield Water Works Dam No 1	Jefferson	40	Significant	Satisfactory	1888
16	Diamond Lake Dam (poweshiek Co)	Poweshiek	40	Significant	Satisfactory	1952
17	Mount Ayr Reservoir Dam	Ringgold	40	Significant	Fair	1930
18	Iowa Select Farms Dam	Union	40	Low	Not assessed	1997
19	Lower Centerville Reservoir Dam	Appanoose	39	Significant	Fair	1912
20	Ledgewood Creek Watershed Site M-2	Fremont	39	Low	Not assessed	1973
21	Lake Morris Dam	Lucas	39	Significant	Fair	1993
22	Southwest Iowa Egg Cooperative Dam	Cass	38	Low	Not assessed	1999
23	Lake Ellis Dam	Lucas	38	Significant	Fair	1993
24	Ledgewood Creek Watershed Site M-3	Fremont	37	Low	Not assessed	1973
25	Nodaway Lake Dam	Adair	35	Significant	Fair	1936
26	Binder Lake Dam	Adams	35	Significant	Satisfactory	1942
27	Walton Lake Dam	Jefferson	35	Significant	Satisfactory	1900
28	Joe Sinclair Dam	Monroe	35	Low	Not assessed	2018
29	Fairfield Waterworks Dam No 2	Jefferson	33	Low	Satisfactory	1900
30	Johnson Dam	Decatur	32	Low	Not assessed	1974
31	Humeston Reservoir Dam	Wayne	31	Significant	Poor	1916
32	Corning Reservoir Dam	Adams	30	Significant	Satisfactory	1917
33	Homepond Dam	Decatur	30	Significant	Fair	1920
34	Lake Lashane Dam	Decatur	30	Significant	Satisfactory	1954
35	Iowa Noname19	Henry	27	Low	Not assessed	1957
36	East Lenox Reservoir Dam	Adams	25	Significant	Satisfactory	1913
37	Old Reservoir Dam	Ringgold	25	Low	Not assessed	1920
38	West Lenox Reservoir Dam	Taylor	25	Significant	Not assessed	1913
39	Promise City Reservoir Dam	Wayne	25	Low	Not assessed	1900
40	Orient Lake Dam	Adair	23	Significant	Satisfactory	1969
41	Lake Maharry Dam	Taylor	21	Low	Not assessed	1969
42	Iowa Noname79	Pottawattamie	19	Low	Not assessed	1973
43	Hawk Lake Dam	Union	18	Low	Not assessed	1967
44	Adel Milldam	Dallas	15	Low	Not assessed	1927
45	Mason City-lehigh Cement Milldam	Cerro Gordo	8	Low	Not assessed	1924
46	Cedar Rapids Milldam Iel&p	Linn	8	Low	Not assessed	1967
47	Boone Milldam	Boone	7	Low	Not assessed	1932
48	Rock Rapids Milldam	Lyon	7	Low	Not assessed	1931
49	Des Moines-waterworks Dam	Polk	7	Low	Not assessed	1923

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