Total streamflow across the Sauk River was last observed at 5,580 cfs, and is expected to yield approximately 11,068 acre-ft of water today; about 68% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 8,255 cfs, with recent peaks last observed on 2021-11-15 when daily discharge volume was observed at 75,153 cfs.

Maximum discharge along the river is currently at the Sauk River At Darrington reporting a streamflow rate of 5,220 cfs. This is also the highest stage along the Sauk River, with a gauge stage of 8.24 ft at this location. This river is monitored from 4 different streamgauging stations along the Sauk River, the highest being situated at an altitude of 1,024 ft, the Sauk River Near St. Cloud.

The Sauk River is located in western Washington and begins in the Cascade Mountains and flows into the Skagit River. The river is approximately 45 miles long and has a rich history dating back to the indigenous Snohomish and Sauk-Suiattle tribes. Hydrologically, the river is known for its high water flow and frequent flooding. The river has several dams and reservoirs, including the Culmback Dam and Reservoir, which is used for flood control and hydroelectric power generation. The river is popular for recreational activities such as fishing, kayaking, and hiking. The Sauk River also plays a significant role in agriculture, providing irrigation water for local farms and orchards.