About this river
Big River is an 11.8 mile river near Old Cove Canoe and Kayak in Missouri. Streamflow is measured at the USGS gauge Big River at Byrnesville, MO (site 07018500). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1922 to 2026
Big River typically runs highest in April, at a median 885 cfs, and lowest in September, at 150 cfs. The highest flow on record for any single day is 59,600 cfs, in 2017.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 437 | 249 to 906 | |
| February | 575 | 324 to 1,020 | |
| March | 832 | 448 to 1,610 | |
| April | 885 | 522 to 1,620 | |
| May | 715 | 407 to 1,290 | |
| June | 357 | 217 to 758 | |
| July | 209 | 145 to 363 | |
| August | 182 | 120 to 281 | |
| September | 150 | 110 to 240 | |
| October | 160 | 123 to 253 | |
| November | 248 | 165 to 519 | |
| December | 330 | 194 to 731 |
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 104 years of record. Statistics published by the US Geological Survey for Big River at Byrnesville, MO (site 07018500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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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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