Berthoud
Berthoud is an earth dam located in Larimer County, Colorado, built in 1962. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Berthoud
The primary purpose of Berthoud is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Town Of Berthoud (matthews, Ken) (local government). It impounds the Little Thompson River-os near Johnstown.
The dam stands 18 feet tall and stretches 2,620 feet across, creates a reservoir covering 61 acres, and has a maximum storage capacity of 835 acre-feet. Completed in 1962, the structure is well into its service life at over 50 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 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 11/16/2021.
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Location
| State | Colorado |
| County | Larimer |
| Nearest City | Johnstown |
| River/Stream | Little Thompson River-os |
| Coordinates | 40.33006, -105.08176 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 2,620 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 835 acre-ft |
| Max Storage | 835 acre-ft |
| Normal Storage | 574 acre-ft |
| Surface Area | 61 acres |
| Max Discharge | 1,670 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | TOWN OF BERTHOUD (MATTHEWS, KEN) |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/16/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00156 |
| Federal ID | CO00156 |
| More Info | State Dam Safety Program |