Green Lake No. 2, located in Boulder, Colorado, is a rockfill dam completed in 1938 for the primary purpose of water supply. With a dam height of 52 feet and a storage capacity of 471 acre-feet, this structure helps regulate the flow of North Boulder Creek. The dam has a low hazard potential and a moderate risk assessment, making it a crucial part of water resource management in the area.

Managed by the local government and regulated by the Colorado Department of Water Resources, Green Lake No. 2 plays a vital role in ensuring water security for the city of Boulder. Despite not being rated for condition assessment, the dam has stood the test of time since its construction over 80 years ago. With a spillway width of 20 feet and a maximum discharge capacity of 4550 cubic feet per second, this dam is equipped to handle a range of hydrological events.

While the last inspection took place in 1986, the dam continues to serve its purpose effectively. With its controlled spillway and stable rockfill structure, Green Lake No. 2 exemplifies sustainable water management practices in the face of changing climate patterns. This dam stands as a testament to the importance of maintaining and investing in water infrastructure for the long-term benefit of communities and ecosystems alike.