Joss is an earth dam located in Niobrara County, Wyoming, built in 1918. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 24 ft24 ft tall and 1,060 ft long. 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 Joss
The primary purpose of Joss is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by E Bar C Limited Partnership (private). It impounds the Lance Creek near Lance Creek.
The dam stands 24 feet tall and stretches 1,060 feet across, creates a reservoir covering 50 acres, and has a maximum storage capacity of 538 acre-feet. Completed in 1918, the structure is over a century 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 05/03/2023.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Lance Creek |
| River/Stream | Lance Creek |
| Coordinates | 42.89306, -104.73306 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 1,060 ft |
| Year Completed | 1918 (108 years old) |
Storage & Hydraulics
| NID Storage | 538 acre-ft |
| Max Storage | 538 acre-ft |
| Normal Storage | 375 acre-ft |
| Surface Area | 50 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | E Bar C Limited Partnership |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/03/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00968 |
| Federal ID | WY00968 |
| More Info | State Dam Safety Program |