5 USGS Streamgages · Columbia River system
Boise River flows and levels
Boise River is gauged at 5 USGS streamgages in Idaho, each tracked by Rivermatics. The mainstem runs about 151 miles (243 km) from headwaters to outlet. It drains into the Columbia River system. It drains roughly 3,909 square miles at its outlet. Rivermatics issues a daily machine-learned 14-day flow outlook at 4 of them.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| Boise River near Twin Springs, ID | ID | 832 | — | 1,916.3 | 985 | 14-day |
| Boise River at Glenwood Bridge near Boise, ID | ID | 2,773 | — | 991.5 | 1,052.5 | 14-day |
| Boise River at Caldwell, ID | ID | 3,363 | — | 2,364.6 | 504 | 14-day + temp |
| Boise River near Parma, ID | ID | 3,906 | — | 1,177.8 | 732.8 | 14-day + temp |
| Boise River above Indian Creek at Caldwell, ID | ID | — | — | — | — | — |
Common questions
- How many gauges are on the Boise River?
- Rivermatics tracks 5 USGS streamgages on the Boise River, across Idaho. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- Is there a flow forecast for the Boise River?
- Yes, at 4 of the 5 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
- What river system is the Boise River part of?
- The Boise River drains into the Columbia River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use Boise River data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Other rivers in the Columbia River system
- Snake River 31 gauges
- Willamette River 11 gauges
- Mckenzie River 9 gauges
- Big Wood River 8 gauges
- Bull Run River 6 gauges
- Cowlitz River 6 gauges
- Deschutes River 6 gauges
- Methow River 6 gauges