Twenty Four Mile
Twenty Four Mile is a dam located in Caribou County, Idaho, built in 1928. It carries a Significant hazard potential classification and has a fair condition assessment.
About Twenty Four Mile
Twenty Four Mile is a dam in Caribou, Idaho. The dam is private-owned. It impounds the Twentyfour Mile Creek Portneuf River near Chesterfield.
The dam stands 27 feet tall and stretches 1,100 feet across, creates a reservoir covering 44 acres, has a storage capacity of 700 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1928, the structure is well-established, with more than 75 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/05/2020.
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Location
| State | Idaho |
| County | Caribou |
| Nearest City | Chesterfield |
| River/Stream | Twentyfour Mile Creek Portneuf River |
| Coordinates | 42.90360, -111.88620 |
Physical Characteristics
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 700 acre-ft |
| Normal Storage | 700 acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 499 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/05/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00015 |
| Federal ID | ID00015 |
| More Info | State Dam Safety Program |