Streamflow discharge was last observed at 1,120 cfs, and a gauge height of 4.63 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 1,162 .
Weather today, Tomorrow,
The flow is primarily provided by snowmelt, precipitation, and groundwater. The river has several tributaries, including the Muddy and Tilton rivers, and is affected by the Mayfield and Mossyrock dams. The river experiences seasonal trends, with higher flows in the spring due to snowmelt and lower flows in the summer and fall. Interesting facts about the hydrology of the Cowlitz River include its history of flooding and its importance as a fishery, particularly for steelhead and Chinook salmon.
| Elevation | 872.0 ft |
| Last Updated | |
| Gage height, ft | 4.63 ft |
| Streamflow, ft³/s | 1120.0 ft3/s |
| Percent of Normal | 77% |
| Year Over Year Average | 1,460 cfs |
| 24hr Flow Prediction | cfs |
| Maximum Recorded | 35,900 cfs |