Sheridan is a dam located in Clark County, Idaho, built in 1873. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 2,340 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Sheridan
Sheridan is a dam in Clark, Idaho. The dam is private-owned. It impounds the East Fork Big Lost River Big Lost River near Island Park Res..
The dam stands 22 feet tall and stretches 2,340 feet across, creates a reservoir covering 286 acres, has a storage capacity of 2,105 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1873, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/14/2018.
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Location
| State | Idaho |
| County | Clark |
| Nearest City | Island Park Res. |
| River/Stream | East Fork Big Lost River Big Lost River |
| Coordinates | 44.45910, -111.68500 |
Physical Characteristics
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 2,340 ft |
| Year Completed | 1873 (153 years old) |
Storage & Hydraulics
| NID Storage | 2,105 acre-ft |
| Normal Storage | 2,105 acre-ft |
| Surface Area | 286 acres |
| Drainage Area | 7 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/14/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00177 |
| Federal ID | ID00177 |
| More Info | State Dam Safety Program |