Flannery is an earth dam located in Garfield County, Colorado, built in 1990. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 200 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Flannery
The primary purpose of Flannery is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Beckley, Steve (private). It impounds the Threemile Creek near Glenwood Springs.
The dam stands 16 feet tall and stretches 200 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 203 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1990, the structure is 36 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 05/24/2021.
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Location
| State | Colorado |
| County | Garfield |
| Nearest City | Glenwood Springs |
| River/Stream | Threemile Creek |
| Coordinates | 39.45612, -107.36307 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 15 ft |
| Dam Length | 200 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 203 acre-ft |
| Max Storage | 203 acre-ft |
| Normal Storage | 105 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 195 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Beckley, Steve |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/24/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02745 |
| Federal ID | CO02745 |
| More Info | State Dam Safety Program |