Total streamflow across the Sandy River was last observed at 6,920 cfs, and is expected to yield approximately 13,726 acre-ft of water today; about 107% of normal. Average streamflow for this time of year is 6,468 cfs, with recent peaks last observed on 2012-01-20 when daily discharge volume was observed at 44,900 cfs.

Maximum discharge along the river is currently at the Sandy River Blw Bull Run River reporting a streamflow rate of 4,700 cfs. However, the streamgauge with the highest stage along the river is the Sandy River Near Marmot with a gauge stage of 692.67 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 Sandy River is a 56-mile long river located in northern Oregon. 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.