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 676–700 of 3,759

All High Hazard Significant Hazard Low Hazard Poor Fair Satisfactory

Dam Name	Height (ft)	Year	Hazard	Condition
Three Mile Creek Watershed Site 65 Adair County	30	1968	Low	Not Rated
Three Mile Creek Watershed Site 63 Adair County	33	1968	Low	Not Rated
Three Mile Creek Watershed Site 58 Union County	32	1968	Low	Not Rated
Three Mile Creek Watershed Site 52-1 Union County	35	1976	Low	Not Rated
Three Mile Creek Watershed Site 50-2 Union County	31	1980	Low	Not Rated
Three Mile Creek Watershed Site 50-1 Union County	33	1976	Low	Not Rated
Three Mile Creek Watershed Site 49 Union County	37	1976	Low	Not Rated
Three Mile Creek Watershed Site 45-2 Union County	31	1970	Low	Not Rated
Three Mile Creek Watershed Site 45-1 Union County	31	1970	Low	Not Rated
Three Mile Creek Watershed Site 43-1 Union County	32	1976	Low	Not Rated
Three Mile Creek Watershed Site 42 Union County	35	1970	Low	Not Rated
Three Mile Creek Watershed Site 36 Union County	35	1976	Low	Not Rated
Three Mile Creek Watershed Site 33 Union County	36	1976	Low	Not Rated
Three Mile Creek Watershed Site 3 Union County	33	1970	Low	Not Rated
Three Mile Creek Watershed Site 29 Union County	33	1970	Low	Not Rated
Three Mile Creek Watershed Site 14-P Union County	23	1976	Low	Not Rated
Three Mile Creek Watershed Site 14-M Union County	25	1976	Low	Not Rated
Three Mile Creek Watershed Site 14-G-1 Union County	27	1976	Low	Not Rated
Three Mile Creek Watershed Site 14-G Union County	31	1970	Low	Not Rated
Three D Dam Story County	34	1971	Low	Not Rated
Thorn Tree Dam Warren County	42	1997	Low	Not Rated
Thorland Dam Winnebago County	20	1968	Low	Not Rated
Thomson Dam Crawford County	27	1975	Low	Not Rated
Thomsen Dam Woodbury County	38	1959	Low	Not Rated
Thompson Dam Decatur County	26	1990	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.