Streamflow
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
Cite
- Columbia River at International Boundary
- Columbia River at The Dalles
About this data
- Source
- US Geological Survey (USGS)
- Series
- Daily mean streamflow (discharge)
- Geography
- Columbia
- Unit
- cfs
- Calculation
- Daily mean
- Last observation
- Aug 26, 2026
- Update frequency
- Daily
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.
| 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 |
Previous weeks
Week of Aug 19, 2026
The Columbia River at International Boundary read 82,900 cfs on Aug 19. The Columbia River at The Dalles read 107,000 cfs on Aug 18.
An earlier week
Columbia River carried 87,800 cfs at the International Boundary and 115,000 cfs at The Dalles on Aug 12.
Week of Aug 13, 2026
The Columbia River ran at 88,600 cfs at the International Boundary and 125,000 cfs at The Dalles as of August 9.
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.