Browse Dams
4,128 dams in the National Inventory of Dams.
National Inventory of Dams
Browse 4,128 dams from the NID database. Each record includes dam name, location, physical dimensions, hazard potential classification, condition assessment, purpose, owner information, and emergency action plan status. Use the filters below to search by state, hazard level, condition, or keyword.
| Name | State | County | Height (ft) | Hazard | Condition | Year | Purpose |
|---|---|---|---|---|---|---|---|
| Fertile Mill Dam | Iowa | Worth | 11 | Low | Not Rated | 1929 | Recreation |
| Holland Marsh Dam | Iowa | Grundy | 11 | Low | Not Rated | 1997 | Recreation |
| Warriner Dam | Iowa | Boone | 11 | Low | - | 2023 | Flood Risk Reduction |
| Fatchett Wetland Dam | Iowa | Clinton | 11 | Low | Not Rated | 1998 | Fish and Wildlife Pond |
| James King Wetland Dam | Iowa | Muscatine | 11 | Low | Not Rated | 1999 | Fish and Wildlife Pond |
| Lylah Marsh Dam | Iowa | Howard | 11 | Low | Not Rated | 1960 | Recreation |
| Hardin County Wetland Dam | Iowa | Hardin | 11 | Low | Not Rated | 1993 | Other |
| Big Mill Wetlands Dam | Iowa | Jackson | 11 | Low | Not Rated | 1981 | Recreation |
| Munson Wrp Dam | Iowa | Dickinson | 11 | Low | Not Rated | 2011 | Fish and Wildlife Pond |
| Mines of Spain Wetland Development Dam | Iowa | Dubuque | 11 | Low | Not Rated | 1996 | Recreation |
| Lenth Wetland Dam (Lower Pool) | Iowa | Van Buren | 11 | Low | Not Rated | 2000 | Fish and Wildlife Pond |
| Kossuth County Roadgrade Dam 16-100-30 | Iowa | Kossuth | 11 | Low | Not Rated | 1999 | Other |
| Hanlontown Slough Dam 1.1 | Iowa | Worth | 11 | Low | Not Rated | 2001 | Fish and Wildlife Pond |
| Greene Mill Dam | Iowa | Butler | 11 | Low | Satisfactory | 1925 | Hydroelectric |
| S 2nd Street Stormwater Detention Basin | Iowa | Marshall | 11 | Low | Not Rated | 1997 | Flood Risk Reduction |
| Jester Park Estates Dam | Iowa | Polk | 11 | Significant | Satisfactory | 2005 | Recreation |
| Des Moines-Center Street Milldam | Iowa | Polk | 11 | Low | Not Rated | 1916 | Recreation |
| South Ridge Estates - South Dam | Iowa | Sioux | 11 | Significant | Not Rated | 2007 | |
| Facebook North Detention Dam | Iowa | Polk | 11 | Low | - | 2020 | Flood Risk Reduction |
| Stanton Dam | Iowa | Montgomery | 10 | Low | Not Rated | - | Other |
| Silver Lake Dam | Iowa | Worth | 10 | Low | Not Rated | - | |
| Waterhouse Wetalnd Dam | Iowa | Washington | 10 | Low | Not Rated | 2003 | Fish and Wildlife Pond |
| Hopkinton Milldam | Iowa | Delaware | 10 | Low | Not Rated | 1925 | Recreation |
| Kiowa Marsh Dam | Iowa | Sac | 10 | Low | Not Rated | 2001 | Fish and Wildlife Pond |
| Dnr Wetlands Dam | Iowa | Boone | 10 | Low | Not Rated | 1984 | Recreation |
| Reitter-Lair Marsh Dam | Iowa | Dickinson | 10 | Low | Not Rated | 1994 | Other |
| Charles City Milldam | Iowa | Floyd | 10 | Low | Not Rated | 1945 | Recreation |
| Oakland Mills Dam | Iowa | Henry | 10 | Low | Satisfactory | 1910 | Recreation |
| Hughes - Stine Wetland Dam | Iowa | Dallas | 10 | Low | Not Rated | 2003 | Fish and Wildlife Pond |
| Swan Lake Dam | Iowa | Carroll | 10 | Low | Not Rated | 1935 | Fish and Wildlife Pond |
| Morse Lake | Iowa | Wright | 10 | Low | Not Rated | - | Fish and Wildlife Pond |
| Nelson South Wetland Dam | Iowa | Pocahontas | 10 | Low | Not Rated | 2004 | Fish and Wildlife Pond |
| Ames Basin #3 | Iowa | Story | 10 | High | Satisfactory | 1985 | Flood Risk Reduction |
| Four D Wetland Dam | Iowa | Iowa | 10 | Low | Not Rated | 2006 | Fish and Wildlife Pond |
| Amana Society Wetland Dam | Iowa | Iowa | 10 | Low | Not Rated | 1995 | Other |
| Elfrink Wetland Dam #2 | Iowa | Van Buren | 10 | Low | Not Rated | 1994 | Other |
| Provost Bay Dam | Iowa | Sac | 10 | Low | Not Rated | - | Other |
| Deere & Co. Dam | Iowa | Black Hawk | 10 | Low | Not Rated | 1981 | Fire Protection, Stock, Or ... |
| Ilex Dam | Iowa | Polk | 10 | Significant | Not Rated | 1980 | Flood Risk Reduction |
| Oxford Mill Dam | Iowa | Jones | 9 | Low | Not Rated | 1927 | Other |
| Amana Millrace Diversion Dam | Iowa | Iowa | 9 | Low | Not Rated | - | Hydroelectric |
| St Ansgar Milldam | Iowa | Mitchell | 9 | Low | Not Rated | 1919 | Recreation |
| Noel Dam | Iowa | Appanoose | 9 | Low | Not Rated | 1998 | Fish and Wildlife Pond |
| Redfield Dam | Iowa | Dallas | 9 | Low | Not Rated | 1913 | Recreation |
| Littleton Dam | Iowa | Buchanan | 9 | Low | Not Rated | 1934 | Recreation |
| Owega, Wsc8 Dam | Iowa | Woodbury | 9 | Low | Not Rated | 2004 | Fish and Wildlife Pond |
| West Dam | Iowa | Warren | 9 | Low | Not Rated | 2000 | Fish and Wildlife Pond |
| White Dam | Iowa | Buena Vista | 9 | Low | - | 2022 | Flood Risk Reduction |
| Einwalter Dam | Iowa | Winneshiek | 9 | Low | - | 2023 | Flood Risk Reduction |
| Knutson Dam | Iowa | Hamilton | 9 | Low | - | 2022 | Flood Risk Reduction |
Frequently Asked Questions
Hazard potential is based on the consequences of dam failure, not the condition of the dam. High hazard means loss of human life is probable. Significant means economic and environmental losses are expected but no probable loss of life. Low means minimal losses are expected. The classification considers downstream population, infrastructure, and environmental resources.
Condition ratings reflect the physical state of the dam based on periodic inspections. Satisfactory means no deficiencies found. Fair means minor issues exist but no immediate action needed. Poor means safety deficiencies require remedial action. Unsatisfactory means the dam is unsafe and immediate corrective action is required.
Yes. Use the search field above to find dams by name. You can also combine the search with state, hazard, and condition filters to narrow your results. Each dam record links to a detail page with complete information.