Coast Fork Willamette River below Cottage Grove Dam, Oregon water temperature
Coast Fork Willamette River below Cottage Grove Dam, Oregon · River
The current water temperature at Coast Fork Willamette River below Cottage Grove Dam is 19.3 °C (as of September 20, 2026, source: USGS).
A river can change temperature within hours — snowmelt, rain or power-plant operations show up immediately. That is why the measured value counts here, not an estimate.
Measurement series & statistics
This measurement series includes 426 data points since July 22, 2026.
Lowest recorded value: 17.4 °C on July 22, 2026 · highest value: 23.0 °C on August 24, 2026.
In September, temperatures have ranged between 19.3 °C and 22.6 °C.
The current value is 1.4 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Coast Fork Willamette River below Cottage Grove Dam right now?
The current water temperature is 19.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Coast Fork Willamette River below Cottage Grove Dam?
Currently 19.3 °C (updated continuously).
How warm is at Coast Fork Willamette River below Cottage Grove Dam in September?
In September, the water temperature recently averaged 20.7 °C.
When is the water warmest at Coast Fork Willamette River below Cottage Grove Dam?
Across the measurement record, August is on average the warmest month (21.0 °C).
