Final answer:
Washington state is home to the Columbia River, which is the largest river in the Pacific coast of the US and the 4th largest in the US by volume. It also has several other major rivers and 14 hydroelectric dams.
Step-by-step explanation:
The state that has the Columbia River, Snake River, Yakima River, and Okanogan River, as well as 14 hydroelectric dams, is Washington. The Columbia River is the largest river in the Pacific coast of the US and the 4th largest by volume in the US. The state's hydroelectric dominance is largely due to the presence of the Columbia River.