Hepp
Hepp is an earth dam located in Johnson County, Wyoming, built in 1964. It carries a Low hazard potential classification and has a poor condition assessment.
About Hepp
The primary purpose of Hepp is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Florence E. Hepp Ranch Ltd. Partnership C/o Hepp Livestock (private). It impounds the Dry Creek near Arvada.
The dam stands 22 feet tall and stretches 1,070 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 172 acre-feet. Completed in 1964, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/28/2023.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Dry Creek |
| Coordinates | 44.34778, -106.51417 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 1,070 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 172 acre-ft |
| Max Storage | 172 acre-ft |
| Normal Storage | 69 acre-ft |
| Surface Area | 16 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | FLORENCE E. HEPP RANCH LTD. PARTNERSHIP C/O HEPP LIVESTOCK |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/28/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00762 |
| Federal ID | WY00762 |
| More Info | State Dam Safety Program |