Steffensen
Steffensen is an earth dam located in Johnson County, Wyoming, built in 1950. It carries a Low hazard potential classification and has a poor condition assessment.
About Steffensen
The primary purpose of Steffensen is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by James R. Purdy Revocable Trust (private). It impounds the Billy Creek near Arvada.
The dam stands 44 feet tall and stretches 340 feet across, creates a reservoir covering 53 acres, and has a maximum storage capacity of 238 acre-feet. Completed in 1950, 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 08/12/2024.
At 44 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Billy Creek |
| Coordinates | 44.11222, -106.74639 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 39 ft |
| Dam Length | 340 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 238 acre-ft |
| Max Storage | 238 acre-ft |
| Normal Storage | 168 acre-ft |
| Surface Area | 53 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JAMES R. PURDY REVOCABLE TRUST |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/12/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00787 |
| Federal ID | WY00787 |
| More Info | State Dam Safety Program |