Boise River

Last Updated: April 20, 2026

Total streamflow across the Boise River was last observed at 4,750 cfs, and is expected to yield approximately 9,422 acre-ft of water today; about 65% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 7,267 cfs, with recent peaks last observed on 2017-06-05 when daily discharge volume was observed at 27,530 cfs.

Maximum discharge along the river is currently at the Boise River Nr Parma Id reporting a streamflow rate of 2,500 cfs. This is also the highest stage along the Boise River, with a gauge stage of 10.32 ft at this location. This river is monitored from 5 different streamgauging stations along the Boise River, the highest being situated at an altitude of 3,257 ft, the Boise River Nr Twin Springs Id.

The Boise River is a 102-mile-long river in Idaho that flows through Boise and empties into the Snake River.


15-Day Long Term Forecast


River Details

Last Updated 2026-04-20
Discharge Volume 9,422 ACRE-FT
Streamflow 4,750.0 cfs
Past 24 Hours: -100.0 cfs (-2.06%)
Percent of Normal 65.36%
Maximum 27,530.0 cfs
2017-06-05
Seasonal Avg 7,267 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Boise River Nr Twin Springs Id
USGS 13185000
2250 cfs 8.08 ft -3.43
Boise River At Glenwood Bridge Nr Boise Id
USGS 13206000
1950 cfs 6 ft -0.51
Boise River South Channel At Eagle Id
USGS 13206305
1230 cfs 4.42 ft -5.38
Boise River At Caldwell
USGS 13211205
2090 cfs 8.89 ft 0.48
Boise River Nr Parma Id
USGS 13213000
2500 cfs 10.32 ft -0.79
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Boise River is a 102-mile-long (164 km) tributary of the Snake River in the northwestern United States. It drains a rugged portion of the Sawtooth Range in southwestern Idaho northeast of Boise, as well as part of the western Snake River Plain. The watershed encompasses approximately 4,100 square miles (11,000 km2) of highly diverse habitats, including alpine canyons, forest, rangeland, agricultural lands, and urban areas.