Cornish Plains Reservoir
Cornish Plains Reservoir is an earth dam located in Weld County, Colorado, built in 2007. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Cornish Plains Reservoir
The primary purpose of Cornish Plains Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by New Cache La Poudre Irrigating Company (trowbridge (private). It impounds the Crow Creek-tr near Barnesville.
The dam stands 21 feet tall and stretches 2,880 feet across, creates a reservoir covering 308 acres, has a maximum storage capacity of 4,870 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2007, the structure is relatively new.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/03/2022.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Barnesville |
| River/Stream | Crow Creek-tr |
| Coordinates | 40.49681, -104.45121 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 2,880 ft |
| Year Completed | 2007 (19 years old) |
Storage & Hydraulics
| NID Storage | 4,870 acre-ft |
| Max Storage | 4,870 acre-ft |
| Normal Storage | 2,655 acre-ft |
| Surface Area | 308 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,293 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | NEW CACHE LA POUDRE IRRIGATING COMPANY (TROWBRIDGE |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/03/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02925 |
| Federal ID | CO02925 |
| More Info | State Dam Safety Program |