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Big Muddy Adventures at Simpson Lake

Big River near Valley Park, MO

River62.1 mi
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Around here

Around Big River

Pin Oak RV Resort18.3 mi10 mi

Public land: USGS PAD-US

About this river

Big River is a 62.1 mile river near Big Muddy Adventures at Simpson Lake in Missouri. Streamflow is measured at the USGS gauge Big River below Bonne Terre, MO (site 07017610). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.

Typical flow by month

2012 to 2026

Big River typically runs highest in April, at a median 515 cfs, and lowest in October, at 55 cfs. The highest flow on record for any single day is 35,600 cfs, in 2017.

Show the numbers
Typical flow by month at Big River below Bonne Terre, MO, in cfs
MonthTypical (cfs)Usual range (cfs)
January252132 to 570
February285117 to 579
March388208 to 867
April515271 to 891
May394213 to 727
June14699 to 330
July10768 to 204
August8353 to 187
September5946 to 89
October5545 to 80
November8763 to 170
December14073 to 299

Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 14 years of record. Statistics published by the US Geological Survey for Big River below Bonne Terre, MO (site 07017610). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.

Boat access nearby

One mapped launch sits in the mapped area of Big River. Ramp data comes from the USGS national boat-ramp inventory.

  • Bonne Terre City LakeBonne Terre City LakePublic

Made to print

Put Big River on your wall

This river section as an art print, drawn over the real terrain with its miles, plus the trails, roads and peaks around it. Pick the colors and the size, and see the finished print before you buy. From $39, shipping included.

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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Big River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.

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