Located in Sequim, Washington, Haller Dam is a private earth dam that was completed in 1945 for fire protection, stock, and small fish pond purposes. The dam stands at a hydraulic height of 45 feet and a structural height of 25 feet, with a length of 150 feet. It has a storage capacity of 20 acre-feet and serves the Dungeness River-Offstream, providing irrigation for the surrounding area.

Managed by the Washington Department of Ecology, Haller Dam is regulated and inspected by the state, ensuring its safety and compliance with environmental standards. With a low hazard potential and a condition assessment of "Not Rated," the dam continues to provide essential water resources while minimizing any potential risks. Its location in Clallam County along the Dungeness River makes it a vital asset for water management in the region.

As a key infrastructure for water resource management in the area, Haller Dam plays a crucial role in supporting agriculture, fire protection, and wildlife habitat. With its historical significance dating back to the mid-20th century, the dam stands as a testament to the importance of sustainable water usage and climate resilience in the face of changing environmental conditions.