Polo is an earth dam located in Sheridan County, Wyoming, built in 1999. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 29 ft29 ft tall and 1,160 ft long, taller than 65% 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 Polo
The primary purpose of Polo is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Jan Pamela Polo Ranch, LLC (private). It impounds the Hanna Creek near Polo Ranch.
The dam stands 29 feet tall and stretches 1,160 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 134 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1999, the structure is 27 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 06/28/2024.
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Location
| State | Wyoming |
| County | Sheridan |
| Nearest City | Polo Ranch |
| River/Stream | Hanna Creek |
| Coordinates | 44.65389, -107.06278 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 26 ft |
| Dam Length | 1,160 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 134 acre-ft |
| Max Storage | 134 acre-ft |
| Normal Storage | 95 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,970 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Jan Pamela Polo Ranch, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/28/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02123 |
| Federal ID | WY02123 |
| More Info | State Dam Safety Program |