Big Delaney is an earth dam located in Weston County, Wyoming, built in 1970. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 235 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Big Delaney
The primary purpose of Big Delaney is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Mark J. Pieloch (private). It impounds the Well Draw near Skull Creek Oil Field.
The dam stands 25 feet tall and stretches 235 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 45 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 05/26/2022.
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Location
| State | Wyoming |
| County | Weston |
| Nearest City | Skull Creek Oil Field |
| River/Stream | Well Draw |
| Coordinates | 44.05630, -104.29650 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 235 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Normal Storage | 19 acre-ft |
| Surface Area | 3 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Mark J. Pieloch |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/26/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00422 |
| Federal ID | WY00422 |
| More Info | State Dam Safety Program |