Los Lagos No. 3 is an earth dam located in Boulder County, Colorado, built in 1894. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 75 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 Los Lagos No. 3
The primary purpose of Los Lagos No. 3 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Roberts, Laurie Brandau (private). It impounds the Beaver Creek-tr near Pinecliffe.
The dam stands 10 feet tall and stretches 75 feet across, creates a reservoir covering 8 acres, and has a maximum storage capacity of 71 acre-feet. Completed in 1894, 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 08/02/2022.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Pinecliffe |
| River/Stream | Beaver Creek-tr |
| Coordinates | 39.93241, -105.50219 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 75 ft |
| Year Completed | 1894 (132 years old) |
Storage & Hydraulics
| NID Storage | 71 acre-ft |
| Max Storage | 71 acre-ft |
| Normal Storage | 58 acre-ft |
| Surface Area | 8 acres |
| Max Discharge | 85 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Roberts, Laurie Brandau |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/02/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00234 |
| Federal ID | CO00234 |
| More Info | State Dam Safety Program |