Sandy River

Total streamflow across the Sandy River was last observed at 4,490 cfs, and is expected to yield approximately 8,906 acre-ft of water today; about 61% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 7,352 cfs, with recent peaks last observed on 2025-12-19 when daily discharge volume was observed at 91,300 cfs.

Maximum discharge along the river is currently at the Sandy River Blw Bull Run River reporting a streamflow rate of 1,670 cfs. However, the streamgauge with the highest stage along the river is the Sandy River Near Marmot with a gauge stage of 690.89 ft. This river is monitored from 4 different streamgauging stations along the Sandy River, the highest being situated at an altitude of 735 ft, the Sandy River Near Marmot.

The river was named after the sandbars that form at the mouth of the river. Historically, the river was used for fishing, logging, and transportation. Today, the river is used for hydroelectric power, irrigation, and recreational purposes. The river's hydrology is heavily influenced by snowmelt, and its flow is regulated by several dams and reservoirs, including the Bull Run Reservoir and the Sandy River Reservoir. These dams and reservoirs provide drinking water to the Portland metropolitan area. The river is a popular destination for fishing, camping, hiking, and river-rafting. The watershed of the Sandy River also supports agriculture and forestry in the region.