Lake Hattie is an earth dam located in Albany County, Wyoming, built in 1912. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 43 ft43 ft tall and 1,480 ft long, taller than 89% 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 Lake Hattie
The primary purpose of Lake Hattie is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Pioneer Canal-lake Hattie Irrigation District (private). It impounds the Laramie River Offstream near Laramie.
The dam stands 43 feet tall and stretches 1,480 feet across, creates a reservoir covering 3,032 acres, has a maximum storage capacity of 130,182 acre-feet, and collects water from a drainage area of 31 square miles. Completed in 1912, the structure is over a century 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. The most recent inspection on record was 04/25/2025.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Wyoming |
| County | Albany |
| Nearest City | Laramie |
| River/Stream | Laramie River Offstream |
| Coordinates | 41.23840, -105.90020 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 43 ft |
| Dam Length | 1,480 ft |
| Year Completed | 1912 (114 years old) |
Storage & Hydraulics
| NID Storage | 130,182 acre-ft |
| Max Storage | 130,182 acre-ft |
| Normal Storage | 65,260 acre-ft |
| Surface Area | 3,032 acres |
| Drainage Area | 31 sq mi |
| Max Discharge | 17,750 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Pioneer Canal-lake Hattie Irrigation District |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 04/25/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00015 |
| Federal ID | WY00015 |
| More Info | State Dam Safety Program |