Lower Afton is an earth dam located in Lincoln County, Wyoming, built in 1942. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 356 ft long, taller than 68% of U.S. dams with a recorded height. 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 Lower Afton
The primary purpose of Lower Afton 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 Swift Creek Power Company (private). It impounds the Swift Creek, Salt River near Afton, Wy.
The dam stands 30 feet tall and stretches 356 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 70 acre-feet, and collects water from a drainage area of 27 square miles. Completed in 1942, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 07/24/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Lincoln |
| Nearest City | Afton, Wy |
| River/Stream | Swift Creek, Salt River |
| Coordinates | 42.72540, -110.91110 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 356 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 70 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 27 sq mi |
| Max Discharge | 870 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Swift Creek Power Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/24/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY12080 |
| Federal ID | WY12080 |
| More Info | State Dam Safety Program |