Great Plains & Intermountain West Region
Includes 9 states with:
107,942 inventoried dams, including:
- 311 that have been reconned for social feasibility of removal
- 95 that have been removed or mitigated, gaining 11,445 miles of reconnected rivers and streams
1,032,542 or more potential road-related aquatic barriers, including:
- 6,401 that have been assessed for impacts to aquatic organisms
- 3,604 that are likely to impact aquatic organisms
- 69 that have been removed or mitigated, gaining 550 miles of reconnected rivers and streams
Data Sources
Records describing dams and road-related barriers within Montana include those maintained by the Montana Department of Fish, Wildlife, and Parks.
Records describing dams and road-related barriers within Utah include those maintained by the Utah Barrier Assessment Inventory Tool.
Information on aquatic barriers in Wyoming is a product of the Wyoming Game & Fish Department, including field data collection in coordination with the Southeast Aquatic Resources Partnership.
Statistics by state:
| Inventoried dams | Reconned dams | Assessed road-related barriers | |||
|---|---|---|---|---|---|
| Colorado | 14,113 | 53 | 425 | ||
| Iowa | 4,431 | 27 | 10 | ||
| Kansas | 22,442 | 2 | 1,467 | ||
| Montana | 15,585 | 25 | 2,096 | ||
| Nebraska | 16,784 | 5 | 2 | ||
| North Dakota | 6,432 | 26 | 176 | ||
| South Dakota | 18,270 | 5 | 237 | ||
| Utah | 3,592 | 65 | 644 | ||
| Wyoming | 10,724 | 130 | 1,354 | ||
| Total | 107,942 | 311 | 6,401 |
6,953 inventoried dams and 467 assessed road-related barriers were not analyzed because they could not be correctly located on the aquatic network or were otherwise excluded from the analysis. You can optionally include these in your download.
Note: These statistics are based on inventoried dams and road-related barriers. Because the inventory is incomplete in many areas, areas with a high number of dams may simply represent areas that have a more complete inventory.
You can help!
You can help improve the inventory You can help improve the inventory by sharing data, assisting with field reconnaissance to evaluate the impact of aquatic barriers, or even by reporting issues with the inventory data in this tool.
Contact us to learn more about how you can help improve aquatic connectivity in the Great Plains & Intermountain West region.