Map of All 1,498 Wyoming Dams
Wyoming has 1,498 dams in the National Inventory of Dams — and 102 are classified as high hazard (7% of the state’s total), meaning failure would likely cause loss of life. 14 Wyoming dams are both high-hazard and in poor or unsatisfactory condition.
Use the interactive Wyoming dams map below to explore every dam in the state, color-coded by hazard level. Click any dam for its condition assessment, last inspection date, and Emergency Action Plan status. Or view the full US Dams interactive map to compare Wyoming to every other state.
Hazard
Condition
Purpose
Wyoming Dams by the Numbers
- 1,498 total dams in Wyoming
- 102 high hazard — failure would likely cause loss of life
- 106 significant hazard
- 1,287 low hazard
- 576 in poor or unsatisfactory condition (543 poor, 33 unsatisfactory)
- 14 Wyoming dams are both high-hazard AND in poor/unsatisfactory condition
Data source: US Army Corps of Engineers, National Inventory of Dams (NID).
The Tallest Dams in Wyoming
The tallest dam in Wyoming is Buffalo Bill Dam at 350 feet, completed in 1910. The 10 tallest Wyoming dams from the National Inventory of Dams:
| Dam | Height | Year | Primary Purpose | Condition | County |
|---|---|---|---|---|---|
| Buffalo Bill Dam | 350 ft | 1910 | Fish and Wildlife Pond | Not Available | Park |
| Seminoe Dam | 295 ft | 1938 | Hydroelectric | Not Available | Carbon |
| Alcova Dam | 265 ft | 1938 | Hydroelectric | Not Available | Natrona |
| Kortes Dam | 244 ft | 1951 | Hydroelectric | Not Available | Carbon |
| Boysen Dam | 220 ft | 1952 | Flood Risk Reduction | Not Available | Fremont |
| Pathfinder Dam | 214 ft | 1909 | Hydroelectric | Not Available | Natrona |
| Anchor Dam | 208 ft | 1960 | Irrigation | Not Available | Hot Springs |
| Greybull Valley (1st Enl.) | 207 ft | 2000 | Irrigation | Fair | Park |
| Glendo Dam | 196 ft | 1958 | Flood Risk Reduction | Not Available | Platte |
| Meeks Cabin Dam | 185 ft | 1971 | Irrigation | Not Available | Uinta |
High-Hazard Wyoming Dams in Poor Condition
The most concerning dams are those classified as high-hazard that also carry a Poor or Unsatisfactory condition rating — 14 dams in Wyoming. Notable examples:
- Laprele (135 ft, Converse County) — Irrigation, Unsatisfactory condition
- Upper Van Tassell (98 ft, Laramie County) — Water Supply, Poor condition
- Hawk Springs (64 ft, Goshen County) — Irrigation, Poor condition
- Eastgate (60 ft, Natrona County) — Fish and Wildlife Pond, Poor condition
- Little Robber Det. Dam X (48 ft, Carbon County) — Debris Control, Poor condition
Filter the interactive US Dams map by hazard and condition to see all of them on one view.
Dam Safety in Wyoming
Dam safety in Wyoming is overseen by the state dam safety program, in coordination with federal regulators: the US Army Corps of Engineers, the Bureau of Reclamation (for federal water projects), the Tennessee Valley Authority where applicable, and the Federal Energy Regulatory Commission (FERC) for licensed hydropower dams. Emergency Action Plans are typically required for high-hazard dams under state regulations.
Frequently Asked Questions
How many dams are in Wyoming?
Wyoming has 1,498 dams in the National Inventory of Dams tracked by the US Army Corps of Engineers: 102 high hazard, 106 significant hazard, and 1,287 low hazard.
What is the tallest dam in Wyoming?
The tallest dam in Wyoming is Buffalo Bill Dam at 350 feet, completed in 1910. It is primarily a fish and wildlife pond structure.
How many Wyoming dams are in poor condition?
576 Wyoming dams are currently rated as being in Poor or Unsatisfactory condition. Of those, 14 are also classified as high-hazard — meaning failure would likely cause loss of life.
