Puff
Puff is an earth dam located in Johnson County, Wyoming, built in 1976. It carries a Low hazard potential classification and has a poor condition assessment.
About Puff
The primary purpose of Puff is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Powder River Ranch, Inc. (private). It impounds the Fortification Creek near Arvada.
The dam stands 30 feet tall and stretches 285 feet across, creates a reservoir covering 5 acres, and has a maximum storage capacity of 59 acre-feet. Completed in 1976, the structure is 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 08/08/2023.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Fortification Creek |
| Coordinates | 44.37694, -106.04694 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 285 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 59 acre-ft |
| Max Storage | 59 acre-ft |
| Normal Storage | 34 acre-ft |
| Surface Area | 5 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | POWDER RIVER RANCH, INC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/08/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01500 |
| Federal ID | WY01500 |
| More Info | State Dam Safety Program |