Great Lakes Region
Includes 7 states with:
24,523 inventoried dams, including:
- 615 that have been reconned for social feasibility of removal
- 602 that have been removed or mitigated, gaining 78,089 miles of reconnected rivers and streams
889,654 or more potential road-related aquatic barriers, including:
- 29,798 that have been assessed for impacts to aquatic organisms
- 11,808 that are likely to impact aquatic organisms
- 142 that have been removed or mitigated, gaining 404 miles of reconnected rivers and streams
Progress toward restoring aquatic connectivity:
Statistics by state:
| Inventoried dams | Reconned dams | Assessed road-related barriers | |||
|---|---|---|---|---|---|
| Illinois | 1,666 | 1 | 65 | ||
| Indiana | 1,602 | 7 | 72 | ||
| Iowa | 4,429 | 28 | 10 | ||
| Michigan | 2,612 | 240 | 15,515 | ||
| Minnesota | 2,308 | 58 | 6,573 | ||
| Ohio | 7,099 | 47 | 851 | ||
| Wisconsin | 4,807 | 234 | 6,712 | ||
| Total | 24,523 | 615 | 29,798 |
6,039 inventoried dams and 6,886 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 Lakes region.