Green Lake No. 2
Green Lake No. 2 is a rockfill dam located in Boulder County, Colorado, built in 1938. It carries a Low hazard potential classification.
About Green Lake No. 2
The primary purpose of Green Lake No. 2 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 52 feet tall and stretches 320 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 471 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 08/07/1986. That was over 39 years ago.
At 52 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Boulder |
| River/Stream | North Boulder Creek |
| Coordinates | 40.04834, -105.61057 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 52 ft |
| Dam Height | 52 ft |
| Dam Length | 320 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 471 acre-ft |
| Max Storage | 471 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 4,550 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF BOULDER (CLARK, KEVIN) |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 08/07/1986 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00225 |
| Federal ID | CO00225 |
| More Info | State Dam Safety Program |