Murphy
Murphy is an earth dam located in Johnson County, Wyoming, built in 1970. It carries a Low hazard potential classification and has a poor condition assessment.
About Murphy
The primary purpose of Murphy is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Zezas Ranch Inc. (private). It impounds the Murphy Draw near Arvada.
The dam stands 25 feet tall and stretches 620 feet across, creates a reservoir covering 9 acres, and has a maximum storage capacity of 112 acre-feet. Completed in 1970, 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 08/12/2024.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Murphy Draw |
| Coordinates | 44.04667, -106.53139 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 620 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 112 acre-ft |
| Max Storage | 112 acre-ft |
| Normal Storage | 60 acre-ft |
| Surface Area | 9 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | ZEZAS RANCH INC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/12/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00708 |
| Federal ID | WY00708 |
| More Info | State Dam Safety Program |