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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
Ryan Montana Cascade 82 High Satisfactory 1915 Hydroelectric
Pike Creek Dam Montana Fergus 81 High Satisfactory 1977 Recreation
Helen B Montana Carter 81 Low — 1966 Irrigation
Cataract Creek Dam Montana Madison 80 High Unsatisfactory 1959 Irrigation
Box Elder Creek Dam Montana Sheridan 80 High Satisfactory 1963 Recreation
East Dam Montana Deer Lodge 80 Significant Satisfactory —
Big Casino Creek Dam Montana Fergus 80 High Satisfactory 1976 Irrigation
Bullhook Lower Diversion Montana Hill 77 High Satisfactory 1955 Flood Risk Reduction
Como Dam Montana Ravalli 76 High Not Available 1910 Irrigation
Petrolia Montana Petroleum 76 High Poor 1951 Irrigation
East Fork Montana Hill 76 High Satisfactory 2007 Recreation
Black Lake Montana Missoula 75 High Unsatisfactory 1967 Recreation
Browns Dam Montana Hill 73 High Not Rated 2007 Irrigation
Yellowtail Afterbay Dam Montana Big Horn 72 High Not Available 1966 Hydroelectric
Hanson Creek Dam Montana Fergus 72 High Satisfactory 1974 Recreation
Lower Two Medicine Montana Glacier 70 High Satisfactory 1967 Irrigation
Three Mile Reservoir (L.&C.) Montana Lewis and Clark 70 High Poor 1926 Irrigation
Sheffels Reservoir Montana Cascade 68 Low — 1963 Fire Protection, Stock, Or ...
Sullivan Dam Montana Toole 68 High Satisfactory 1967 Flood Risk Reduction
Castle Rock Reservoir Dam Montana Rosebud 67 High Satisfactory 1976 Other
Moulton Creek Dam #1 Montana Silver Bow 67 High Satisfactory 1907 Water Supply
Lars Montana Chouteau 66 Low — 1950 Irrigation
Tiber Dike Montana Liberty 65 High Not Available 1956
Cowpath Dam Montana Toole 65 High Satisfactory 1967 Flood Risk Reduction
Bearpaw Lake Dam Montana Hill 64 High Satisfactory 1958 Recreation
Frenchman Dam Montana Phillips 63 Significant — 1953 Irrigation
Thompson Falls - Intake Dam A Montana Sanders 62 Low Satisfactory 1915 Hydroelectric
Hey Ray #2 Montana Chouteau 61 Low — 1958 Fire Protection, Stock, Or ...
Tabor South Montana Lake 60 High Poor 1930 Recreation
Delmoe Lake Dam Montana Jefferson 60 High Poor 1914 Irrigation
Douglas Creek Tailings Dam Montana Granite 60 Significant — — Tailings
Deadmans Basin Dam Montana Wheatland 60 High Satisfactory 1941 Irrigation
Pirate Dam Montana Chouteau 60 Significant — 1982 Other
O'Day #2 Montana Cascade 60 Low — 1956 Fire Protection, Stock, Or ...
Bynum Reservoir Dam Montana Teton 60 High Satisfactory 1926 Irrigation
Lake Frances East Dam Montana Pondera 59 High Satisfactory 1909 Irrigation
Flower Creek Dam Montana Lincoln 59 High Satisfactory 2016 Water Supply
Scott Coulee Dam Montana Hill 58 High Satisfactory 1955 Flood Risk Reduction
Crazy Sombreo Montana Meagher 58 Significant — 1950 Irrigation
Glacier Lake North Dam Montana Carbon 57 High Satisfactory 1937 Irrigation
Panasuk Dam Montana Roosevelt 57 Significant — — Flood Risk Reduction
Chessman Main Dam Montana Lewis and Clark 57 High Fair 1908 Water Supply
Lima Montana Beaverhead 56 High Satisfactory 1934 Irrigation
Ackley Lake Dam Montana Judith Basin 55 High Satisfactory 1938 Irrigation
Georgetown Dam Montana Deer Lodge 55 High Satisfactory 1900 Hydroelectric
Nilan North Dam Montana Lewis and Clark 54 High Satisfactory 1951 Irrigation
Thompson Falls - Main Channel Dam Montana Sanders 54 Low Satisfactory 1915 Hydroelectric
Swift Dike (Pondera) Montana Pondera 53 High Satisfactory 1967 Irrigation
Powell Montana Powell 52 High Poor 1981 Irrigation
Big Sky Dam Montana Madison 52 High Satisfactory 1973 Recreation

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.