Blacksmith Fork is an earth dam located in Cache County, Utah, built in 1972. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 260 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 Blacksmith Fork
The primary purpose of Blacksmith Fork is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by City of Hyrum (local government). It impounds the Blacksmith Fork Logan River near Hyrum.
The dam stands 15 feet tall and stretches 260 feet across, creates a reservoir covering 6 acres, and has a maximum storage capacity of 42 acre-feet. Completed in 1972, the structure is well into its service life at over 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/24/2022.
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Location
| State | Utah |
| County | Cache |
| Nearest City | Hyrum |
| River/Stream | Blacksmith Fork Logan River |
| Coordinates | 41.62710, -111.67830 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 14 ft |
| Dam Length | 260 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 42 acre-ft |
| Max Storage | 42 acre-ft |
| Normal Storage | 22 acre-ft |
| Surface Area | 6 acres |
| Max Discharge | 1,700 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of Hyrum |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/24/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00377 |
| Federal ID | UT00377 |
| More Info | State Dam Safety Program |