Grand Mesa #1
Grand Mesa #1 is an earth dam located in Mesa County, Colorado, built in 1887. It carries a Significant hazard potential classification and has a unsatisfactory condition assessment.
About Grand Mesa #1
The primary purpose of Grand Mesa #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by City Of Grand Junction (local government). It impounds the Reservoir Creek near Grand Junction.
The dam stands 22 feet tall and stretches 800 feet across, creates a reservoir covering 48 acres, has a maximum storage capacity of 655 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1887, 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 unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. An emergency action plan is in place for this dam. The most recent inspection on record was 10/13/2021.
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Location
| State | Colorado |
| County | Mesa |
| Nearest City | Grand Junction |
| River/Stream | Reservoir Creek |
| Coordinates | 39.01001, -108.11223 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 800 ft |
| Year Completed | 1887 (139 years old) |
Storage & Hydraulics
| NID Storage | 655 acre-ft |
| Max Storage | 655 acre-ft |
| Normal Storage | 559 acre-ft |
| Surface Area | 48 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 240 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | CITY OF GRAND JUNCTION |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 10/13/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00826 |
| Federal ID | CO00826 |
| More Info | State Dam Safety Program |