Jerry Johns Reservoir No. 1 is an earth dam located in Sheridan County, Wyoming, built in 1977. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 470 ft long, taller than 50% 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 Jerry Johns Reservoir No. 1
The primary purpose of Jerry Johns Reservoir 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 J Bar D Ranch, LLC (private). It impounds the Spring Or Wymer Draw.
The dam stands 25 feet tall and stretches 470 feet across, creates a reservoir covering 3 acres, and has a storage capacity of 26 acre-feet. Completed in 1977, the structure is 49 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 08/26/2021.
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Location
| State | Wyoming |
| County | Sheridan |
| River/Stream | Spring Or Wymer Draw |
| Coordinates | 44.71930, -107.02060 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 470 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 26 acre-ft |
| Normal Storage | 26 acre-ft |
| Surface Area | 3 acres |
| Max Discharge | 1,016 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | J Bar D Ranch, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/26/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01304 |
| Federal ID | WY01304 |
| More Info | State Dam Safety Program |