Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Tolt River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Tolt River, the highest being situated at an altitude of ft, the .

The Tolt River is a 25-mile-long river in King County, Washington, that flows into the Snoqualmie River. It has a rich history, as it was once home to the Snoqualmie Tribe and later used for logging and milling operations. The river is fed by several tributaries and has an average flow of 350 cubic feet per second. The Tolt River is also home to two reservoirs, the Tolt Reservoir and the South Fork Tolt Reservoir, which provide drinking water to the Seattle metropolitan area. The Tolt River is a popular destination for recreational activities such as fishing, boating, and hiking, and its waters also support agriculture in the surrounding areas.