Rock Island is a gravity-type dam located on the Columbia River in Washington, with a height of 71 feet and a hydraulic height of 55.1 feet. Completed in 1932, the dam serves the primary purpose of hydroelectric power generation and flood risk reduction. It has a storage capacity of 131,000 acre-feet and a drainage area of 89,400 square miles, making it a crucial water resource infrastructure in the region.

Managed by the Federal Energy Regulatory Commission, Rock Island has a controlled spillway width of 961 feet and 31 slide gates for water control. With a hazard potential rated as high and a risk assessment indicating very high risk, the dam's emergency action plan is crucial for public safety. Despite its age, the dam's condition assessment is not available, emphasizing the need for ongoing monitoring and maintenance to ensure its structural integrity and long-term functionality for water resource management in the area.

Rock Island's association with Stone & Webster Engineering Corporation underscores its historical significance in water resource development. As a key player in the region's hydroelectric landscape, the dam's operations and maintenance are vital for ensuring water security and climate resilience in the face of changing environmental conditions. For water resource and climate enthusiasts, Rock Island represents a blend of engineering excellence, environmental stewardship, and critical infrastructure for sustainable water management in the Pacific Northwest.