Purdy
Purdy is an earth dam located in Johnson County, Wyoming, built in 1966. It carries a Low hazard potential classification and has a fair condition assessment.
About Purdy
The primary purpose of Purdy is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Robinson Canyon Ranch, Llc (private). It impounds the South Fork Crazy Woman near Arvada.
The dam stands 30 feet tall and stretches 600 feet across, creates a reservoir covering 53 acres, and has a maximum storage capacity of 766 acre-feet. Completed in 1966, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/18/2022.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | South Fork Crazy Woman |
| Coordinates | 44.02560, -106.65780 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 600 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 766 acre-ft |
| Max Storage | 766 acre-ft |
| Normal Storage | 424 acre-ft |
| Surface Area | 53 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | ROBINSON CANYON RANCH, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/18/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00754 |
| Federal ID | WY00754 |
| More Info | State Dam Safety Program |