Massae is an earth dam located in Uinta County, Wyoming, built in 1968. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 24 ft24 ft tall and 3,142 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 Massae
The primary purpose of Massae is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Petersen Properties, LLC (private). It impounds the Mill Creek Offstream near Evanston.
The dam stands 24 feet tall and stretches 3,142 feet across, creates a reservoir covering 22 acres, and has a maximum storage capacity of 266 acre-feet. Completed in 1968, the structure is well into its service life at over 50 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 07/15/2024.
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Location
| State | Wyoming |
| County | Uinta |
| Nearest City | Evanston |
| River/Stream | Mill Creek Offstream |
| Coordinates | 41.01333, -110.84361 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 3,142 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 266 acre-ft |
| Max Storage | 266 acre-ft |
| Normal Storage | 158 acre-ft |
| Surface Area | 22 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Petersen Properties, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/15/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01209 |
| Federal ID | WY01209 |
| More Info | State Dam Safety Program |