The Columbia River: Undisputed King of the US West Coast

The Columbia River is the largest river on the US West Coast by both discharge volume and length.

Key Metrics

• Length: 2,000 km (1,243 mi) — 1,931 km (1,200 mi) in US.
• Mean Discharge: 7,500 m³/s (265,000 cfs) at mouth — >10x any other West Coast river.
• Basin: 668,000 km² (258,000 mi²) across 7 US states + British Columbia.
• Source: Columbia Lake, Canadian Rockies (BC).
• Mouth: Pacific Ocean at Astoria, Oregon (treacherous Columbia Bar).

Why It Dominates

Drains the wet, mountainous interior of the Pacific Northwest (Rockies, Cascades). Massive snowpack + orographic rainfall = huge, reliable flow. Other West Coast rivers (Colorado, Sacramento, Klamath, Fraser) are smaller, drier, or heavily diverted.

Engineered Powerhouse

14 mainstem dams produce ~40% of US hydropower. Enables irrigation (Columbia Basin Project), navigation (to Lewiston, ID), flood control. Salmon recovery is the central ecological challenge.

No other West Coast river matches its scale, energy, or economic centrality.