Rivermatics

3 USGS Streamgages · Mississippi River system

Smith River flows and levels

Smith River is gauged at 3 USGS streamgages in Montana, each tracked by Rivermatics. The mainstem runs about 159 miles (256 km) from headwaters to outlet. It drains into the Mississippi River system. Drainage area at the gauges ranges from 845 square miles at Smith River near Ft Logan, MT up to 1,588 at Smith River near Eden, MT. The gauged reach falls about 875 feet, from 4,391 feet down to 3,515. Rivermatics issues a daily machine-learned 14-day flow outlook for every one 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.

USGS streamgages on this river, ordered upstream to downstream
Gauge State Drainage sq mi Elevation ft April p50 cfs July p50 cfs Forecast
Smith River near Ft Logan, MT MT 845 4,391 139.2 135.5 14-day
Smith River below Eagle Creek near Fort Logan, MT MT 1,087 4,350 264.8 166.4 14-day + temp
Smith River near Eden, MT MT 1,588 3,515 324.7 291 14-day

Typical flow by month at Smith River near Eden, MT

The furthest-downstream gauge on this river, so the fullest flow it carries here. Long-term daily discharge percentiles from the USGS record (up to 75 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 39.9 91.8 198.9
February 55.2 109.4 231.7
March 79.5 157 363.3
April 145.8 324.7 764.4
May 410.1 845.3 1,977.7
June 380.7 800.4 2,431
July 117.1 291 730.5
August 56 119.4 288.7
September 52.3 116.6 283.8
October 81.5 138.4 260
November 61.2 130.6 280.4
December 39.5 102.6 201.2

All values in cubic feet per second (cfs).

Common questions

When does the Smith River run highest?
May, on the long-term record at Smith River near Eden, MT — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 845.3 cfs that month, against 91.8 cfs in January, the lowest. Upstream gauges peak on their own schedule; the table on this page gives April and July for each.
How many gauges are on the Smith River?
Rivermatics tracks 3 USGS streamgages on the Smith River, across Montana. 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 Smith River?
Yes, at 3 of the 3 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 Smith River part of?
The Smith River drains into the Mississippi 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 Smith 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 Mississippi River system

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