Rivermatics

2 USGS Streamgages · Mississippi River system

South Fork Shoshone River flows and levels

South Fork Shoshone River is gauged at 2 USGS streamgages in Wyoming, each tracked by Rivermatics. The mainstem runs about 69 miles (112 km) from headwaters to outlet. It drains into the Mississippi River system. Drainage area at the gauges ranges from 306 square miles at South Fork Shoshone River near Valley, WY up to 580 at South Fork Shoshone River Ab Buffalo Bill Reservoir, WY. The gauged reach falls about 756 feet, from 6,208 feet down to 5,452. Rivermatics issues a daily machine-learned 14-day flow outlook at 1 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
South Fork Shoshone River near Valley, WY WY 306 6,208 138.6 961.4 —
South Fork Shoshone River Ab Buffalo Bill Reservoir, WY WY 580 5,452 152.2 790.7 14-day

Typical flow by month at South Fork Shoshone River Ab Buffalo Bill Reservoir, WY

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 123 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 77.8 106.8 141.5
February 78 101.4 132.1
March 85.4 109.9 165.8
April 63.6 152.2 419.4
May 125 611.7 1,537.6
June 551.6 1,639 3,317
July 133.5 790.7 1,975.1
August 1.7 70.8 388.4
September 1 15 227.8
October 22.7 99.2 300.3
November 103.9 165.2 231.8
December 80 118.3 169.2

All values in cubic feet per second (cfs).

Common questions

When does the South Fork Shoshone River run highest?
June, on the long-term record at South Fork Shoshone River Ab Buffalo Bill Reservoir, WY — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 1,639 cfs that month, against 15 cfs in September, 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 South Fork Shoshone River?
Rivermatics tracks 2 USGS streamgages on the South Fork Shoshone River, across Wyoming. 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 South Fork Shoshone River?
Yes, at 1 of the 2 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 South Fork Shoshone River part of?
The South Fork Shoshone 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 South Fork Shoshone 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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