One Horse Gap, located in Pope County, Illinois, is a federal-owned earth dam completed in 1973 for the primary purpose of recreation.
Wind
Humidity
Standing at a height of 30 feet with a hydraulic height of 23 feet, the dam boasts a length of 443 feet and a storage capacity of 304 acre-feet. Managed by the USDA Forest Service, the dam is regulated, inspected, and enforced by the agency to ensure its safety and functionality.
With a significant hazard potential and a fair condition assessment as of August 2019, One Horse Gap poses moderate risk according to a risk assessment rating of 3. The spillway type is uncontrolled, with a width of 20 feet, and the dam is situated on the TR-GRAND PIERRE river. Despite its age, the dam remains a key feature for recreation in the area, offering opportunities for water-based activities and scenic views for water resource and climate enthusiasts to enjoy.
Overall, One Horse Gap serves as an important structure within the federal-owned land, providing both recreational opportunities and water management benefits. As a well-maintained and regulated earth dam, it stands as a testament to the ongoing efforts of the USDA Forest Service to ensure the safety and sustainability of water resources in Illinois.
Year Completed |
1973 |
Dam Length |
443 |
Dam Height |
30 |
River Or Stream |
TR-GRAND PIERRE |
Primary Dam Type |
Earth |
Surface Area |
29 |
Hydraulic Height |
23 |
Nid Storage |
304 |
Structural Height |
36 |
Hazard Potential |
Significant |
Nid Height |
36 |
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8cfs |
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7cfs |
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259000cfs |
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0cfs |
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38cfs |
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444000cfs |
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|---|---|---|
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High Knob Campground
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Teal Pond Campground
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Red Bud Campground
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