Zemba is an earth dam located in Sublette County, Wyoming, built in 1915. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 320 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 Zemba
The primary purpose of Zemba is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Midland Livestock Company (private). It impounds the Long Draw & Granite Gulch near Farson.
The dam stands 16 feet tall and stretches 320 feet across, creates a reservoir covering 18 acres, and has a maximum storage capacity of 124 acre-feet. Completed in 1915, 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 07/18/2022.
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Location
| State | Wyoming |
| County | Sublette |
| Nearest City | Farson |
| River/Stream | Long Draw & Granite Gulch |
| Coordinates | 42.53490, -109.29330 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 320 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 124 acre-ft |
| Max Storage | 124 acre-ft |
| Normal Storage | 87 acre-ft |
| Surface Area | 18 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Midland Livestock Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/18/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01215 |
| Federal ID | WY01215 |
| More Info | State Dam Safety Program |