Green Lake No. 3
Green Lake No. 3 is a rockfill dam located in Boulder County, Colorado, built in 1907. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Green Lake No. 3
The primary purpose of Green Lake No. 3 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 City Of Boulder (clark, Kevin) (local government). It impounds the North Boulder Creek near Boulder.
The dam stands 28 feet tall and stretches 315 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 345 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1907, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 07/16/1990. That was over 35 years ago.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Boulder |
| River/Stream | North Boulder Creek |
| Coordinates | 40.05139, -105.61557 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 315 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 345 acre-ft |
| Max Storage | 345 acre-ft |
| Normal Storage | 285 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 205 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF BOULDER (CLARK, KEVIN) |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/16/1990 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01779 |
| Federal ID | CO01779 |
| More Info | State Dam Safety Program |