Cold Springs Reservoir #1 in Lassen, California, is a privately owned earth dam structure on Cold Spring Creek. This reservoir, with a height of 17.4 feet and a storage capacity of 2815 acre-feet, serves as an essential water resource in the region. The dam has a low hazard potential and is in fair condition as of the last assessment in September 2017.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Cold Springs Reservoir #1 is subject to state regulation, permitting, inspection, and enforcement. The dam's primary purpose and associated structures are not specified, but its location and design indicate a critical role in water storage and management in the area. With a surface area of 640 acres and a length of 300 feet, the reservoir plays a key role in maintaining water supply and flow in the region.

Overall, Cold Springs Reservoir #1 stands as an important infrastructure for water resource management in California. With its low hazard potential and fair condition, the dam continues to support the community by ensuring water storage and proper regulation of Cold Spring Creek. Its significance in the region's water supply network highlights the importance of maintaining and monitoring such structures for the sustainable management of water resources in the face of changing climate conditions.