Nw Pearson
Nw Pearson is an earth dam located in Campbell County, Wyoming, built in 1970. It carries a Low hazard potential classification and has a fair condition assessment.
About Nw Pearson
The primary purpose of Nw Pearson is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Moriah Wyoming Ranches, Llc & Anadarko E&p Onshore, Llc (private). It impounds the West Preason Draw near Unnamed Ranch.
The dam stands 48 feet tall and stretches 458 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 114 acre-feet, and collects water from a drainage area of 0 square miles. 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 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 04/27/2021.
At 48 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Wyoming |
| County | Campbell |
| Nearest City | Unnamed Ranch |
| River/Stream | West Preason Draw |
| Coordinates | 44.15280, -105.96730 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 43 ft |
| Dam Length | 458 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 114 acre-ft |
| Max Storage | 114 acre-ft |
| Normal Storage | 79 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 900 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | MORIAH WYOMING RANCHES, LLC & ANADARKO E&P ONSHORE, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/27/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02361 |
| Federal ID | WY02361 |
| More Info | State Dam Safety Program |