Map of All 392 Arizona Dams
Arizona has 392 dams in the National Inventory of Dams — and 170 are classified as high hazard (43% of the state’s total), meaning failure would likely cause loss of life. 34 Arizona dams are both high-hazard and in poor or unsatisfactory condition.
Use the interactive Arizona 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 Arizona to every other state.
Hazard
Condition
Purpose
Arizona Dams by the Numbers
- 392 total dams in Arizona
- 170 high hazard — failure would likely cause loss of life
- 38 significant hazard
- 172 low hazard
- 44 in poor or unsatisfactory condition (35 poor, 9 unsatisfactory)
- 34 Arizona 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 Arizona
The tallest dam in Arizona is Glen Canyon Dam at 710 feet, completed in 1963. The 10 tallest Arizona dams from the National Inventory of Dams:
| Dam | Height | Year | Primary Purpose | Condition | County |
|---|---|---|---|---|---|
| Glen Canyon Dam | 710 ft | 1963 | Hydroelectric | Not Available | Coconino |
| New Waddell Dam | 440 ft | 1992 | Flood Risk Reduction | Not Available | Maricopa |
| 1 West | 400 ft | – | Tailings | Not Available | Graham |
| Theodore Roosevelt Dam | 357 ft | 1911 | Hydroelectric | Not Available | Maricopa |
| Sierrita | 350 ft | – | Tailings | Not Available | Pima |
| Parker Dam | 320 ft | 1938 | Hydroelectric | Not Available | La Paz |
| Bartlett Dam | 309 ft | 1939 | Water Supply | Not Available | Maricopa |
| 3 West | 307 ft | – | Tailings | Not Available | Graham |
| Horse Mesa Dam | 305 ft | 1927 | Hydroelectric | Not Available | Maricopa |
| Alamo Dam | 283 ft | 1968 | Flood Risk Reduction | Not Available | Mohave |
High-Hazard Arizona Dams in Poor Condition
The most concerning dams are those classified as high-hazard that also carry a Poor or Unsatisfactory condition rating — 34 dams in Arizona. Notable examples:
- Elgo (133 ft, Graham County) — Recreation, Poor condition
- Jaques (81 ft, Navajo County) — Other, Poor condition
- Fool Hollow (78 ft, Navajo County) — Recreation, Poor condition
- Black Canyon (72 ft, Navajo County) — Recreation, Poor condition
- Walnut Canyon (70 ft, Coconino County) — Irrigation, Poor condition
Filter the interactive US Dams map by hazard and condition to see all of them on one view.
Dam Safety in Arizona
Dam safety in Arizona 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 Arizona?
Arizona has 392 dams in the National Inventory of Dams tracked by the US Army Corps of Engineers: 170 high hazard, 38 significant hazard, and 172 low hazard.
What is the tallest dam in Arizona?
The tallest dam in Arizona is Glen Canyon Dam at 710 feet, completed in 1963. It is primarily a hydroelectric structure.
How many Arizona dams are in poor condition?
44 Arizona dams are currently rated as being in Poor or Unsatisfactory condition. Of those, 34 are also classified as high-hazard — meaning failure would likely cause loss of life.
