Lewis is an earth dam located in Big Horn County, Wyoming, built in 1948. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 19 ft19 ft tall and 1,540 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 Lewis
The primary purpose of Lewis is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Timothy J. Woods & Samantha Wright (private). It impounds the Gypsum Creek Offstream.
The dam stands 19 feet tall and stretches 1,540 feet across, creates a reservoir covering 19 acres, and has a storage capacity of 122 acre-feet. Completed in 1948, the structure is well-established, with more than 75 years of service.
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 09/23/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Big Horn |
| River/Stream | Gypsum Creek Offstream |
| Coordinates | 44.99720, -108.40890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 1,540 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 122 acre-ft |
| Normal Storage | 122 acre-ft |
| Surface Area | 19 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Timothy J. Woods & Samantha Wright |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/23/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01740 |
| Federal ID | WY01740 |
| More Info | State Dam Safety Program |