Dunnagan
Dunnagan is an earth dam located in Archuleta County, Colorado, built in 1949. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Dunnagan
The primary purpose of Dunnagan is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by James Cloman (private). It impounds the Roush Draw near Blanco, Nm.
The dam stands 19 feet tall and stretches 569 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 201 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1949, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 08/24/1987. That was over 38 years ago.
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Location
| State | Colorado |
| County | Archuleta |
| Nearest City | Blanco, Nm |
| River/Stream | Roush Draw |
| Coordinates | 37.34739, -107.14252 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 14 ft |
| Dam Length | 569 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 201 acre-ft |
| Max Storage | 201 acre-ft |
| Normal Storage | 93 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 378 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JAMES CLOMAN |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/24/1987 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01093 |
| Federal ID | CO01093 |
| More Info | State Dam Safety Program |