Whatcom Lake Dam, located in Bellingham, Washington, serves as a crucial water supply source for the surrounding area. Built in 1937, this earth dam stands at a hydraulic height of 19 feet, with a structural height of 14 feet and a length of 109 feet. The dam has a normal storage capacity of 25,000 acre-feet and a maximum storage capacity of 70,000 acre-feet, providing essential water resources for the region.

Managed by the Washington Department of Ecology, Whatcom Lake Dam is regulated and inspected regularly to ensure its safety and functionality. Despite being classified as having a high hazard potential, the dam's condition assessment remains satisfactory as of the last inspection in April 2018. With a drainage area of 55.9 square miles and a surface area of 5000 acres, the dam plays a crucial role in managing water resources and mitigating potential risks in the area.

In addition to its primary purpose of water supply, Whatcom Lake Dam also offers recreational opportunities for the community. The dam's association with Whatcom Creek and its location within the scenic surroundings of Whatcom County make it a valuable asset for both water resource management and outdoor recreation enthusiasts.