# Columbia basin streamflow Daily mean discharge across 2 gauges _Data through Aug 26, 2026 · source last checked Aug 27, 2026 · page revised Aug 27, 2026_ > 2 basin-representative gauges tracked. The Columbia River carried 149,000 cfs at The Dalles and 80,300 cfs at the International Boundary on Aug 26. ## The numbers | Gauge | Discharge | As of | | --- | --- | --- | | Columbia River at The Dalles | 149,000 cfs | Aug 26, 2026 | | Columbia River at International Boundary | 80,300 cfs | Aug 26, 2026 | ## About Columbia basin The Columbia drains roughly 258,000 square miles across seven US states and British Columbia, and carries more water to the Pacific than any other river in North America. This page lines up its two mainstem index gages: the International Boundary station, which measures Canadian runoff arriving under the Columbia River Treaty, and The Dalles, which measures nearly the whole basin below the Snake confluence. The two answer different questions. The boundary gage is a read on Canadian storage operations, which supply a disproportionate share of the river's summer flow. The Dalles is the basin total and the figure regional runoff forecasts are quoted in. When the boundary line holds up while The Dalles falls, the shortfall is in the US interior, the Snake and the Columbia's American tributaries; when both fall together, it is a basin-wide water year. ## About this data - Source: US Geological Survey (USGS) - Series: Daily mean streamflow (discharge) - Geography: Columbia - Unit: cfs - Calculation period: Daily mean - Last observation: Aug 26, 2026 - Update frequency: Daily --- Cite: Columbia basin: 149,000 cfs daily mean discharge as of Aug 26, 2026 (USGS). The Waterline. https://the-waterline.com/streamflow/columbia-basin Canonical URL: https://the-waterline.com/streamflow/columbia-basin