Anderson #1
Anderson #1 is an earth dam located in Mesa County, Colorado, built in 1963. It carries a Significant hazard potential classification and has a fair condition assessment.
About Anderson #1
The primary purpose of Anderson #1 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Grand Junction (local government). It impounds the Kannah Creek near Grand Junction.
The dam stands 29 feet tall and stretches 970 feet across, creates a reservoir covering 59 acres, has a maximum storage capacity of 821 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1963, the structure is well into its service life at over 50 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/05/2021.
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Location
| State | Colorado |
| County | Mesa |
| Nearest City | Grand Junction |
| River/Stream | Kannah Creek |
| Coordinates | 39.03000, -108.12890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 26 ft |
| Dam Length | 970 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 821 acre-ft |
| Max Storage | 821 acre-ft |
| Normal Storage | 467 acre-ft |
| Surface Area | 59 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 772 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF GRAND JUNCTION |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/05/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00070 |
| Federal ID | CO00070 |
| More Info | State Dam Safety Program |