Granby #12
Granby #12 is an earth dam located in Delta County, Colorado, built in 1949. It carries a High hazard potential classification and has a fair condition assessment.
About Granby #12
The primary purpose of Granby #12 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Granby Ditch & Reservoir Co. (thompson, Brian) (private). It impounds the Dirty George Creek-tr near Cedaredge.
The dam stands 33 feet tall and stretches 895 feet across, creates a reservoir covering 49 acres, and has a maximum storage capacity of 909 acre-feet. Completed in 1949, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 07/28/2022.
At 33 feet, this dam is taller than 78% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Colorado dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Colorado |
| County | Delta |
| Nearest City | Cedaredge |
| River/Stream | Dirty George Creek-tr |
| Coordinates | 38.99833, -108.04223 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 27 ft |
| Dam Length | 895 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 909 acre-ft |
| Max Storage | 909 acre-ft |
| Normal Storage | 664 acre-ft |
| Surface Area | 49 acres |
| Max Discharge | 441 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | GRANBY DITCH & RESERVOIR CO. (THOMPSON, BRIAN) |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 07/28/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00719 |
| Federal ID | CO00719 |
| More Info | State Dam Safety Program |