Enl. Gerry Nicolaysen No. 1 is an earth dam located in Converse County, Wyoming, built in 1966. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 35 ft35 ft tall and 1,350 ft long, taller than 80% 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 Enl. Gerry Nicolaysen No. 1
The primary purpose of Enl. Gerry Nicolaysen No. 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Parkerton Ranches Inc (private). It impounds the Cole Creek near Big Muddy Oil Field.
The dam stands 35 feet tall and stretches 1,350 feet across, creates a reservoir covering 74 acres, and has a maximum storage capacity of 1,163 acre-feet. Completed in 1966, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/05/2024.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Big Muddy Oil Field |
| River/Stream | Cole Creek |
| Coordinates | 43.06000, -106.02472 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 1,350 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 1,163 acre-ft |
| Max Storage | 1,163 acre-ft |
| Normal Storage | 757 acre-ft |
| Surface Area | 74 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Parkerton Ranches Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/05/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00279 |
| Federal ID | WY00279 |
| More Info | State Dam Safety Program |