Iowa Dams

4,124 dams tracked by the National Inventory of Dams

Total Dams

4,124

High Hazard

2.2%

Poor / Unsatisfactory

Average Age

46 yrs

Hazard Classification

High91 (2.2%)

Significant274 (6.6%)

Low3,759 (91.1%)

Condition Assessment

Satisfactory259 (6.3%)

Fair81 (2.0%)

Poor / Unsatisfactory25 (0.6%)

Not Rated3,759 (91.1%)

Federal

State

141

Local

1,938

Private

2,014

Tallest Dams

High Hazard Dams

Poor Condition Dams

All Dams in Iowa

Showing 476–500 of 3,759

All High Hazard Significant Hazard Low Hazard Poor Fair Satisfactory

Dam Name	Height (ft)	Year	Hazard	Condition
Upper Beaver Subwatershed Site 4-1 Monona County	49	1968	Low	Not Rated
Upper Beaver Subwatershed Site 20-1 Monona County	51	1967	Low	Not Rated
Upper Beaver Subwatershed Site 15-1 Monona County	54	1966	Low	Not Rated
Upland Investments Dam Fremont County	23	2021	Low	Not Rated
Union Hill Wpa Dam Cerro Gordo County	8	1997	Low	Not Rated
Union Grove Silt Containment Dam Tama County	17	1990	Low	Not Rated
Union County Roadgrade Dam 29-73-29 Union County	39	1993	Low	Not Rated
Uhl Dam Woodbury County	38	1969	Low	Not Rated
U-B Subwatershed Site 2c-1 Monona County	34	1962	Low	Not Rated
U-B Subwatershed Site 2-2 Monona County	51	1962	Low	Not Rated
Tyer Dam Woodbury County	22	1997	Low	Not Rated
Twin Ponies Watershed Site 8 Pottawattamie County	36	1990	Low	Not Rated
Twin Ponies Watershed Site 17a Pottawattamie County	54	1998	Low	Satisfactory
Twin Anchors Lake Dam Story County	42	1960	Low	Not Rated
Twelvemile Watershed Site D-60 Union County	35	1999	Low	Not Rated
Twelve Mile Creek Watershed Site D-44-1 Union County	36	2008	Low	Not Rated
Twelve Mile Creek Watershed Site D-44 Union County	34	2003	Low	Not Rated
Twelve Mile Creek Watershed Site D-41-A-5 Union County	36	2006	Low	Not Rated
Twelve Mile Creek Watershed Site D-41a4 Union County	32	1993	Low	Not Rated
Twelve Mile Creek Watershed Site D-41-A-3 Union County	33	2006	Low	Not Rated
Twelvemile Creek Watershed Site D-41-A2 Union County	38	1999	Low	Not Rated
Twelve Mile Creek Watershed Site D-35 Union County	38	1988	Low	Not Rated
Twelve Mile Creek Watershed Site 77 Union County	22	1979	Low	Not Rated
Twelve Mile Creek Watershed Site 73 Union County	30	1979	Low	Not Rated
Twelve Mile Creek Watershed Site 72-2 Union County	23	1979	Low	Not Rated

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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.