Rock Gap is an earth dam located in Grand County, Colorado, built in 1966. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 33 ft33 ft tall and 312 ft long, taller than 76% of U.S. dams with a recorded height. 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 Rock Gap
The primary purpose of Rock Gap is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hamilton Duncan, (private). It impounds the Hartman Gulch-os near State Bridge.
The dam stands 33 feet tall and stretches 312 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 84 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1966, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/01/2019.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Colorado |
| County | Grand |
| Nearest City | State Bridge |
| River/Stream | Hartman Gulch-os |
| Coordinates | 39.94668, -106.50058 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 30 ft |
| Dam Length | 312 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 84 acre-ft |
| Max Storage | 84 acre-ft |
| Normal Storage | 52 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 406 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Hamilton Duncan, |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/01/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00687 |
| Federal ID | CO00687 |
| More Info | State Dam Safety Program |