Clennon
Clennon is an earth dam located in Weld County, Colorado, built in 1879. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Clennon
The primary purpose of Clennon is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by New Day Sunrise, Llc (brad Johnson) (private). It impounds the St. Vrain Creek-os near Platteville.
The dam stands 14 feet tall and stretches 2,000 feet across, creates a reservoir covering 17 acres, and has a maximum storage capacity of 147 acre-feet. Completed in 1879, the structure is over a century 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/28/2021.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Platteville |
| River/Stream | St. Vrain Creek-os |
| Coordinates | 40.25420, -104.94450 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 2,000 ft |
| Year Completed | 1879 (147 years old) |
Storage & Hydraulics
| NID Storage | 147 acre-ft |
| Max Storage | 147 acre-ft |
| Normal Storage | 86 acre-ft |
| Surface Area | 17 acres |
| Max Discharge | 32 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | NEW DAY SUNRISE, LLC (BRAD JOHNSON) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/28/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01203 |
| Federal ID | CO01203 |
| More Info | State Dam Safety Program |