Big Boy
Big Boy is an earth dam located in Johnson County, Wyoming, built in 1969. It carries a Low hazard potential classification and has a poor condition assessment.
About Big Boy
The primary purpose of Big Boy 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 V Bar F Cattle Company (private). It impounds the Caple Dr, Tr Dble. Crossing Dr near Arvada.
The dam stands 33 feet tall and stretches 350 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 55 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1969, 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 06/23/2021.
At 33 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Caple Dr, Tr Dble. Crossing Dr |
| Coordinates | 44.48240, -106.44830 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 350 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 55 acre-ft |
| Max Storage | 55 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,543 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | V BAR F CATTLE COMPANY |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/23/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00602 |
| Federal ID | WY00602 |
| More Info | State Dam Safety Program |