Rockwell is an earth dam located in Weld County, Colorado, built in 1885. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 1,100 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 Rockwell
The primary purpose of Rockwell is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Jeff Rockwell, (private). It impounds the Big Hollow near Johnstown.
The dam stands 16 feet tall and stretches 1,100 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 441 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1885, the structure is over a century 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 10/28/2016.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Johnstown |
| River/Stream | Big Hollow |
| Coordinates | 40.27450, -105.03704 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1885 (141 years old) |
Storage & Hydraulics
| NID Storage | 441 acre-ft |
| Max Storage | 441 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 1,050 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Jeff Rockwell, |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/28/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01193 |
| Federal ID | CO01193 |
| More Info | State Dam Safety Program |