How does the Snake River contribute to the Columbia River basin?

The Snake River is the largest tributary of the Columbia River, playing a vital role in the basin's hydrology and economic infrastructure.12

Its contributions include:

• Hydrology and Drainage: The Snake River drains a massive basin of approximately 109,000 square miles (282,000 square km), collecting runoff from Wyoming, Utah, Nevada, Idaho, Oregon, and Washington before joining the Columbia near Pasco, Washington.1
• Navigation: The lower Snake River features four dams equipped with large navigation locks. These facilities, combined with those on the Columbia, enable barge traffic to travel more than 460 miles inland from the Pacific Ocean to Lewiston, Idaho.23
• Power and Irrigation: The river is a critical component of the Pacific Northwest's power network. Its course is heavily regulated by dams used for hydroelectric generation and irrigation, supporting the broader multipurpose development of the Columbia River system.13

While these developments have been instrumental in regional economic growth, they have also created significant environmental challenges, particularly regarding the survival of salmon populations due to barriers to migration and habitat loss.43