Holiday Lake Dam, located in Whatcom, Washington, is a private earth dam completed in 1967 with a primary purpose of recreation. Standing at a hydraulic height of 24 feet and a structural height of 23 feet, it provides a maximum storage capacity of 22 acre-feet and a normal storage of 9 acre-feet. The dam, situated on Tr-Hale Passage, has a surface area of 2.4 acres and a high hazard potential, but its condition assessment in 2015 deemed it satisfactory.

Managed by the Washington Department of Ecology, Holiday Lake Dam is state-regulated, with inspection, permitting, and enforcement protocols in place. The dam has not undergone modifications in recent years and lacks emergency preparedness measures such as an Emergency Action Plan. Despite the high hazard potential, the dam's risk assessment and management strategies remain unspecified, highlighting a need for further evaluation and safety measures to address potential risks associated with the structure.

The dam's location in a recreational area and its proximity to the Tr-Hale Passage make it an essential water resource for the region. With its historical significance dating back to the 1960s, Holiday Lake Dam serves as a key structure for water storage and recreation purposes in the state of Washington. However, the lack of recent risk assessments and emergency preparedness plans underscores the importance of continued monitoring and maintenance to ensure the safety and longevity of the dam for both residents and the environment.