Dam Safety Data
Explore 92,625 dams across 53 states from the National Inventory of Dams. 16,894 classified as high hazard potential.
Browse by State
View dams by state to see hazard potential, condition assessments, and dam details in your area.
Browse by Hazard Potential
Filter dams by hazard potential classification -- from high hazard (loss of life probable) to low hazard.
Tallest Dams in the United States
The tallest dams in the National Inventory of Dams, ranked by NID height.
| # | Dam Name | State | Height (ft) | Hazard | Condition |
|---|---|---|---|---|---|
| 1 | Thompson Mtis | Idaho | 789 | High | Fair |
| 2 | Chess Refuse Disposal Area No. 1 | West Virginia | 780 | High | Not Available |
| 3 | Oroville | California | 770 | High | Fair |
| 4 | Delbarton Slurry Impoundment | West Virginia | 760 | High | Not Rated |
| 5 | Hoover Dam | Nevada | 730 | High | Not Available |
| 6 | Glen Canyon Dam | Arizona | 710 | High | Not Available |
| 7 | Abner Fork Dam | Kentucky | 700 | High | Not Available |
| 8 | Sidney Slurry Impoundment | Kentucky | 665 | High | Not Available |
| 9 | Long Fork Slurry Impoundment | Kentucky | 665 | High | Not Available |
| 10 | Killarney Slurry Impoundment | West Virginia | 657 | High | Not Available |
| 11 | New Bullards Bar | California | 645 | High | Satisfactory |
| 12 | Jake Gore Slurry Impoundment | West Virginia | 610 | High | Not Available |
| 13 | Long Bottom Branch Dam | Virginia | 605 | Undetermined | Not Rated |
| 14 | Brushy Fork Impoundment | West Virginia | 605 | High | Not Rated |
| 15 | Shasta Dam | California | 602 | High | Not Available |
By Hazard Potential
Dam classification based on potential consequences of failure.
| Hazard Level | Dams |
|---|---|
| Low | 60,343 |
| High | 16,894 |
| Significant | 11,360 |
| Undetermined | 4,027 |
| Not Rated | 1 |
By Condition Assessment
Physical state of dams based on inspection results.
| Condition | Dams |
|---|---|
| Not Rated | 36,831 |
| Satisfactory | 13,002 |
| Fair | 12,547 |
| Poor | 7,711 |
| Not Available | 3,540 |
| Unsatisfactory | 1,071 |
How It Works
Search Dam Records
Browse 92,625 dams from the U.S. Army Corps of Engineers National Inventory of Dams. Search by name, state, hazard potential, or condition assessment.
Review Safety Details
Each dam record includes height, storage capacity, hazard classification, condition assessment, owner information, and emergency action plan status.
Understand the Risks
Use hazard potential and condition data to understand which dams pose the greatest risks. High hazard dams with poor conditions represent the most critical infrastructure concerns.
Frequently Asked Questions
All dam data comes from the U.S. Army Corps of Engineers National Inventory of Dams (NID). The NID is the most comprehensive database of dams in the United States, containing records for 92,625 dams across 53 states and territories.
Hazard potential classifies dams based on potential consequences of failure, not the dam's current condition. High 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 expected.
Satisfactory means no deficiencies. Fair means minor issues, no immediate action needed. Poor means safety deficiencies require remedial action. Unsatisfactory means the dam is unsafe and requires immediate corrective action.
An EAP is a formal document that identifies potential emergency conditions at a dam and specifies actions to minimize property damage and loss of life. It includes notification procedures, evacuation routes, and inundation maps. High hazard dams are generally required to have an EAP.