Iowa Dams

4,124 dams tracked by the National Inventory of Dams

Total Dams

4,124

High Hazard

91

2.2%

Poor / Unsatisfactory

25

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

25

State

141

Local

1,938

Private

2,014

All Dams in Iowa

Showing 501525 of 4,124

Dam NameHeight (ft)YearHazardCondition
Upper Centerville Reservoir Dam

Appanoose County

481912SignificantFair
Upper Beaver Subwatershed Site M-2

Monona County

431967LowNot Rated
Upper Beaver Subwatershed Site M-1

Monona County

601967LowPoor
Upper Beaver Subwatershed Site 6-1

Monona County

641967LowNot Rated
Upper Beaver Subwatershed Site 51-1

Monona County

361968LowNot Rated
Upper Beaver Subwatershed Site 50-1

Monona County

491968LowNot Rated
Upper Beaver Subwatershed Site 4-1

Monona County

491968LowNot Rated
Upper Beaver Subwatershed Site 20-1

Monona County

511967LowNot Rated
Upper Beaver Subwatershed Site 15-1

Monona County

541966LowNot Rated
Upland Investments Dam

Fremont County

232021LowNot Rated
Union Hill Wpa Dam

Cerro Gordo County

81997LowNot Rated
Union Grove Silt Containment Dam

Tama County

171990LowNot Rated
Union Grove Lake Dam

Tama County

291920SignificantFair
Union County Roadgrade Dam 29-73-29

Union County

391993LowNot Rated
Uhl Dam

Woodbury County

381969LowNot Rated
U-B Subwatershed Site 2c-1

Monona County

341962LowNot Rated
U-B Subwatershed Site 2-2

Monona County

511962LowNot Rated
Tyer Dam

Woodbury County

221997LowNot Rated
Twin Valley Lakes - East Dam

Johnson County

501965SignificantPoor
Twin Ponies Watershed Site 8

Pottawattamie County

361990LowNot Rated
Twin Ponies Watershed Site 17a

Pottawattamie County

541998LowSatisfactory
Twin Anchors Lake Dam

Story County

421960LowNot Rated
Twenty-Sixth Street Stormwater Detention Basin

Polk County

432007HighSatisfactory
Twelvemile Watershed Site D-60

Union County

351999LowNot Rated
Twelve Mile Creek Watershed Site M-1

Union County

661983HighSatisfactory
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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.