Coal Bank Watershed Cb-1 is an earth dam located in Weld County, Colorado, built in 1961. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 64 ft64 ft tall and 2,544 ft long, taller than 96% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Coal Bank Watershed Cb-1
The primary purpose of Coal Bank Watershed Cb-1 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Natural Resources Conservation Service Area 2 (federal). It impounds the Coal Bank Draw near Eaton.
The dam stands 64 feet tall and stretches 2,544 feet across, creates a reservoir covering 139 acres, has a maximum storage capacity of 2,754 acre-feet, and collects water from a drainage area of 27 square miles. Completed in 1961, the structure is well into its service life at over 50 years old.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/30/2016. That was over 10 years ago.
At 64 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Eaton |
| River/Stream | Coal Bank Draw |
| Coordinates | 40.62667, -104.83558 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 64 ft |
| Dam Height | 51 ft |
| Dam Length | 2,544 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 2,754 acre-ft |
| Max Storage | 2,754 acre-ft |
| Normal Storage | 2,101 acre-ft |
| Surface Area | 139 acres |
| Drainage Area | 27 sq mi |
| Max Discharge | 8,029 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Natural Resources Conservation Service Area 2 |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/30/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00128 |
| Federal ID | CO00128 |
| More Info | State Dam Safety Program |