Rivermatics

3 USGS Streamgages · Columbia River system

Gros Ventre River flows and levels

Gros Ventre River is gauged at 3 USGS streamgages in Wyoming, each tracked by Rivermatics. The mainstem runs about 69 miles (111 km) from headwaters to outlet. It drains into the Columbia River system. Drainage area at the gauges ranges from 407 square miles at Gros Ventre River Ab Upper Slide Lake, near Kelly, WY up to 683 at Gros Ventre River at Zenith, WY. The gauged reach falls about 985 feet, from 7,301 feet down to 6,316. Rivermatics issues a daily machine-learned 14-day flow outlook at 2 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
Gros Ventre River Ab Upper Slide Lake, near Kelly, WY WY 407 7,301 154.4 374.5 —
Gros Ventre River at Kelly, WY WY 622 6,648 270 734.3 14-day + temp
Gros Ventre River at Zenith, WY WY 683 6,316 134.9 263 14-day

Typical flow by month at Gros Ventre River at Zenith, 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 109 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Only 11 of 12 months have enough record to summarize; the rest are omitted.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
February — 104.7 —
March — 96.9 —
April 42.2 134.9 297.8
May 177.3 642.7 1,828.7
June 177.1 1,052.4 2,562
July 13.9 263 1,174.2
August 3.5 44.8 329.9
September 0.2 32.9 148.4
October — 63.4 —
November — 67 —
December — 29.5 —

All values in cubic feet per second (cfs).

Common questions

When does the Gros Ventre River run highest?
June, on the long-term record at Gros Ventre River at Zenith, WY — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 1,052.4 cfs that month, against 29.5 cfs in December, 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 Gros Ventre River?
Rivermatics tracks 3 USGS streamgages on the Gros Ventre 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 Gros Ventre River?
Yes, at 2 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 Gros Ventre River part of?
The Gros Ventre 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 Gros Ventre 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

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