Rivermatics

4 USGS Streamgages · Mississippi River system

Grand River flows and levels

Grand River is gauged at 4 USGS streamgages in Missouri, each tracked by Rivermatics. The mainstem runs about 223 miles (359 km) from headwaters to outlet. It drains into the Mississippi River system. Drainage area at the gauges ranges from 1,720 square miles at Grand River near Pattonsburg, MO up to 6,880 at Grand River near Sumner, MO. The gauged reach falls about 127 feet, from 771 feet down to 644. 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
Grand River near Pattonsburg, MO MO 1,720 771 485.5 351.7 14-day
Grand River near Gallatin, MO MO 2,250 720 592.5 234.7 14-day
Grand River near Fountain Grove, MO MO 6,240 673 2,338.7 1,452 14-day
Grand River near Sumner, MO MO 6,880 644 2,519 1,019.6 14-day

Typical flow by month at Grand River near Sumner, MO

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 100 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 104.3 665.2 3,996.5
February 142.4 1,337.9 10,109.7
March 377.6 2,239.4 18,509.7
April 556.9 2,519 20,050
May 527.7 2,665.8 21,354.8
June 380.7 2,245.7 25,170
July 205.2 1,019.6 10,462.6
August 158.4 600.5 5,344.8
September 123 429.5 9,052
October 92 433.8 7,414.8
November 112 546.4 5,451.7
December 98.5 634.3 4,658.7

All values in cubic feet per second (cfs).

Common questions

When does the Grand River run highest?
May, on the long-term record at Grand River near Sumner, MO — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 2,665.8 cfs that month, against 429.5 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 Grand River?
Rivermatics tracks 4 USGS streamgages on the Grand River, across Missouri. 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 Grand River?
Yes, at 4 of the 4 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 Grand River part of?
The Grand 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 Grand 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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