Casto
Casto is an earth dam located in Mesa County, Colorado, built in 1940. It carries a Significant hazard potential classification and has a fair condition assessment.
About Casto
The primary purpose of Casto is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John Hendricks (sisson, Alan) (private). It impounds the Gill Creek near Gateway.
The dam stands 26 feet tall and stretches 910 feet across, creates a reservoir covering 99 acres, has a maximum storage capacity of 1,298 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 06/02/2022.
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Location
| State | Colorado |
| County | Mesa |
| Nearest City | Gateway |
| River/Stream | Gill Creek |
| Coordinates | 38.73000, -108.67723 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 910 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 1,298 acre-ft |
| Max Storage | 1,298 acre-ft |
| Normal Storage | 803 acre-ft |
| Surface Area | 99 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 1,470 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOHN HENDRICKS (SISSON, ALAN) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/02/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00294 |
| Federal ID | CO00294 |
| More Info | State Dam Safety Program |