Total streamflow across the Sweetwater River was last observed at 171 cfs, and is expected to yield approximately 339 acre-ft of water today; about 76% of normal. Average streamflow for this time of year is 224 cfs, with recent peaks last observed on 2017-05-19 when daily discharge volume was observed at 2,720 cfs.

Maximum discharge along the river is currently at the Sweetwater River Near Sweetwater Station reporting a streamflow rate of 171 cfs. However, the streamgauge with the highest stage along the river is the Sweetwater R Nr Descanso Ca with a gauge stage of 4.8 ft. This river is monitored from 4 different streamgauging stations along the Sweetwater River, the highest being situated at an altitude of 6,593 ft, the Sweetwater River Near Sweetwater Station.

The Sweetwater River is a 55-mile long river located in San Diego County, California. Historically, it was used by the Kumeyaay people for fishing and hunting. Today, it serves as a major source of water for the county. The river's hydrology is affected by both natural factors, such as rainfall, and man-made factors, including water diversion and dam operations. Specific reservoirs and dams on the Sweetwater River include Loveland Reservoir, Sweetwater Reservoir, and Lower Sweetwater Dam. These structures are used to store water for municipal and agricultural purposes. Recreational activities such as hiking, fishing, and camping are popular along the river, though access can be limited due to private property rights.