Cooper
Cooper is an earth dam located in Natrona County, Wyoming, built in 1933. It carries a Low hazard potential classification and has a poor condition assessment.
About Cooper
The primary purpose of Cooper 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 Dona Marie Vold-larsen (private). It impounds the Branch Of South Powder River near Arvada.
The dam stands 16 feet tall and stretches 1,450 feet across, creates a reservoir covering 21 acres, and has a maximum storage capacity of 232 acre-feet. Completed in 1933, 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 05/24/2023.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Natrona |
| Nearest City | Arvada |
| River/Stream | Branch Of South Powder River |
| Coordinates | 43.00333, -107.21333 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 1,450 ft |
| Year Completed | 1933 (93 years old) |
Storage & Hydraulics
| NID Storage | 232 acre-ft |
| Max Storage | 232 acre-ft |
| Normal Storage | 95 acre-ft |
| Surface Area | 21 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | DONA MARIE VOLD-LARSEN |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/24/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01009 |
| Federal ID | WY01009 |
| More Info | State Dam Safety Program |