Unit 3 Ash and Clear Water is an earth dam located in Lincoln County, Wyoming, built in 1994. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 61 ft61 ft tall and 3,450 ft long, taller than 95% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Unit 3 Ash and Clear Water
The primary purpose of Unit 3 Ash and Clear Water is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Pacificorp, Naughton Power Plant (public utility). It impounds the Hams Fork-offchannel near Hwy. 189.
The dam stands 61 feet tall and stretches 3,450 feet across, creates a reservoir covering 215 acres, and has a storage capacity of 3,370 acre-feet. Completed in 1994, the structure is 32 years old.
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 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 08/18/2021.
At 61 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Wyoming |
| County | Lincoln |
| Nearest City | Hwy. 189 |
| River/Stream | Hams Fork-offchannel |
| Coordinates | 41.75667, -110.58028 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 61 ft |
| Dam Height | 61 ft |
| Dam Length | 3,450 ft |
| Year Completed | 1994 (32 years old) |
Storage & Hydraulics
| NID Storage | 3,370 acre-ft |
| Normal Storage | 3,370 acre-ft |
| Surface Area | 215 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Pacificorp, Naughton Power Plant |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/18/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01547 |
| Federal ID | WY01547 |
| More Info | State Dam Safety Program |