Polaris
Polaris is an earth dam located in Laramie County, Wyoming, built in 1909. It carries a Significant hazard potential classification and has a poor condition assessment.
About Polaris
The primary purpose of Polaris is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Terry Grazing Association (private). It impounds the Lone Tree Creek Offstream near Timnath, Colorado.
The dam stands 51 feet tall and stretches 1,071 feet across, creates a reservoir covering 57 acres, has a maximum storage capacity of 687 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1909, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 05/10/2022.
At 51 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Wyoming |
| County | Laramie |
| Nearest City | Timnath, Colorado |
| River/Stream | Lone Tree Creek Offstream |
| Coordinates | 41.02790, -104.89000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 51 ft |
| Dam Height | 41 ft |
| Dam Length | 1,071 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 687 acre-ft |
| Max Storage | 687 acre-ft |
| Normal Storage | 608 acre-ft |
| Surface Area | 57 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | TERRY GRAZING ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/10/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00047 |
| Federal ID | WY00047 |
| More Info | State Dam Safety Program |