Lamb Upper is an earth dam located in Converse County, Wyoming, built in 1953. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 28 ft28 ft tall and 280 ft long, taller than 62% 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 Lamb Upper
The primary purpose of Lamb Upper is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John Robert & Beverly K. Ballew (private). It impounds the Brushy Draw, Tr East Muddy Crk near Big Muddy Oil Field.
The dam stands 28 feet tall and stretches 280 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 171 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1953, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/18/2022.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Big Muddy Oil Field |
| River/Stream | Brushy Draw, Tr East Muddy Crk |
| Coordinates | 42.74450, -106.06850 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 280 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 171 acre-ft |
| Max Storage | 171 acre-ft |
| Normal Storage | 88 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 618 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John Robert & Beverly K. Ballew |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/18/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00305 |
| Federal ID | WY00305 |
| More Info | State Dam Safety Program |