Grassy Lake (hatch) is an earth dam located in Summit County, Utah, built in 2005. It carries a Significant hazard potential classification.
Dam profile
NID height · 27 ft27 ft tall and 300 ft long, taller than 59% 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 Grassy Lake (hatch)
The primary purpose of Grassy Lake (hatch) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Two Bear Land and Grazing Corporation (private). It impounds the Trib to West Fk Bear River near Evanston, Wyo..
The dam stands 27 feet tall and stretches 300 feet across, has a maximum storage capacity of 500 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2005, the structure is relatively new.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/29/2023.
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Location
| State | Utah |
| County | Summit |
| Nearest City | Evanston, Wyo. |
| River/Stream | Trib to West Fk Bear River |
| Coordinates | 40.94352, -110.86406 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Length | 300 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 500 acre-ft |
| Max Storage | 500 acre-ft |
| Normal Storage | 275 acre-ft |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Two Bear Land and Grazing Corporation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 08/29/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00428 |
| Federal ID | UT00428 |
| More Info | State Dam Safety Program |