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Browse Dams

3,029 dams in the National Inventory of Dams.

National Inventory of Dams

Browse 3,029 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
Big Sky Dam Montana Madison 52 High Satisfactory 1973 Recreation
Big John M Montana Fergus 52 Low — 1972 Irrigation
Nilan East Dam Montana Lewis and Clark 51 High Satisfactory 1951 Irrigation
Jocko Montana Missoula 51 High Poor 1937 Irrigation
Four Horns Montana Glacier 50 High Satisfactory 1915 Irrigation
Mccracken Brothers Montana Toole 50 Low — 1953 Fire Protection, Stock, Or ...
Broadwater Dam Montana Broadwater 50 High Satisfactory 1940 Hydroelectric
Rosann Rosanna Dana Montana Sweet Grass 50 Low — 1939 Other
Stoyanoff Montana Meagher 50 Low — 1947 Irrigation
Doggett Reservoir Montana Meagher 50 High Fair 1948 Irrigation
Pishkun Dike 1 Montana Teton 50 High Not Available 1930 Irrigation
Basin Creek Dam #2 Montana Silver Bow 49 Significant Poor 1907 Water Supply
Martinsdale, East Dam Montana Wheatland 49 High Poor 1939 Irrigation
South Sandstone Creek Dam Montana Fallon 49 Significant — 1975 Irrigation
Booth (Chouteau) Montana Chouteau 48 Low — 1961 Irrigation
Pablo Montana Lake 47 High Unsatisfactory 1912 Irrigation
Thompson Falls - Dry Channel Dam Montana Sanders 47 Low Satisfactory 1915 Hydroelectric
South Side Detention Dam Montana Carbon 47 Low Poor — Flood Risk Reduction
Stauffer Chemical #1 Montana Silver Bow 47 Low — 1954 Other
Browns Montana Chouteau 47 Low — 1986 Fire Protection, Stock, Or ...
Ralph Clark #1 Montana Garfield 47 Low — 1955 Fire Protection, Stock, Or ...
Mcdonald Montana Lake 47 High Satisfactory 1920 Irrigation
Ix Ranch Montana Chouteau 46 Low — 1951 Irrigation
Frog Montana Blaine 46 Low — 1960 Fire Protection, Stock, Or ...
Gardner #1 (East Dam) Montana Carter 46 Low — 1962 Irrigation
No 10 Montana Blaine 45 Low — 1930 Fire Protection, Stock, Or ...
Dramamine Montana Judith Basin 45 Low — 1967 Fire Protection, Stock, Or ...
Shining Mountain Montana Ravalli 45 Low — 1972 Fire Protection, Stock, Or ...
Mystic Lake Montana Stillwater 45 High Satisfactory 1927 Hydroelectric
Dry Fork Montana Blaine 45 Significant — 1986 Irrigation
Westermark Montana Toole 45 Low — 1964 Recreation
Ernie Hudson Montana Stillwater 45 Low — 1928 Irrigation
Carson (Mn-66) Montana Blaine 45 Low — 1940 Fire Protection, Stock, Or ...
Taylor #2 Montana Garfield 45 Low — 1979 Fire Protection, Stock, Or ...
Green Hollow Creek Dam Montana Madison 45 High Satisfactory 1990 Recreation
Bailey-Dees-Frey Montana Hill 44 Low — 1968 Recreation
Bar Island Detention Dam Montana Phillips 44 Low Poor 1967 Flood Risk Reduction
Lake Creek Montana Lincoln 44 High Satisfactory 1917 Hydroelectric
Rainbow Montana Cascade 44 High Satisfactory 1910 Hydroelectric
German Bread Montana Blaine 44 Low — 1950 Fire Protection, Stock, Or ...
Prairie Nest Ranch 3 Montana Cascade 44 Low — 1959 Irrigation
Bonanza Montana Meagher 44 Significant — 1938 Irrigation
I.U. Reservoir Montana Blaine 44 Low — 1938 Irrigation
Colstrip Diversion Dam Montana Rosebud 44 High Satisfactory 1976 Other
Taylor, Upper Montana Powell 43 High Satisfactory 1951 Irrigation
Peet Creek Dam Montana Beaverhead 43 Significant — — Irrigation
Cow Creek Montana Blaine 43 Significant — — Fish and Wildlife Pond
Anita Dam Montana Blaine 42 High Fair 1995 Irrigation
Square Butte Detention Dam Montana Phillips 42 Low Poor 1967 Flood Risk Reduction
Vananda Montana Rosebud 42 Low — 1936 Irrigation

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.