Nimmo No. 8 is an earth dam located in Laramie County, Wyoming, built in 1942. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 620 ft long, taller than 55% 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 Nimmo No. 8
The primary purpose of Nimmo No. 8 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by True Ranches LLC (private). It impounds the Lost Corner Creek near Morrill, Ne.
The dam stands 26 feet tall and stretches 620 feet across, creates a reservoir covering 8 acres, and has a maximum storage capacity of 71 acre-feet. 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/16/2023.
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Location
| State | Wyoming |
| County | Laramie |
| Nearest City | Morrill, Ne |
| River/Stream | Lost Corner Creek |
| Coordinates | 41.43560, -104.94060 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 620 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 71 acre-ft |
| Max Storage | 71 acre-ft |
| Normal Storage | 71 acre-ft |
| Surface Area | 8 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | True Ranches LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/16/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02594 |
| Federal ID | WY02594 |
| More Info | State Dam Safety Program |