Big River at Byrnesville, MO
Jefferson County, Missouri · USGS 07018500
Latest observation
What this gauge represents: This gauge measures conditions on Big River at its USGS monitoring location in Jefferson County; conditions elsewhere on the waterway may differ.
Observed · 46 minutes ago
Observed
Observed
How to read these numbers
How much water moves past the gauge each second. Higher numbers mean more water is moving downstream.
The water-surface height at this gauge. It is useful for tracking rises, falls and flood thresholds, but it is not the river's total depth.
How much the latest reading has risen or fallen compared with roughly 24 hours earlier.
The typical streamflow for this date based on USGS historical statistics. A multiple such as 3× means current flow is about three times the historical median.
Get Water Data's plain-language summary of current flow, historical context and recent direction.
Official action and flood thresholds where available. These levels are specific to each gauge location.
Gauge height and flood stage are station-specific. A 12-foot reading at one gauge should not be directly compared with 12 feet at another.
Below historical median · Steady
Streamflow is currently 120 ft³/s, 25% below the historical median for this date. Flow has been relatively steady over the past 24 hours.
USGS-reported historical daily median for 09-27: 160 ft³/s · Based on USGS day-of-year statistics
How trends & context are calculated →Streamflow trend
Daily mean streamflow · Aug 28–Sep 25 · dates shown in UTC · 29 observations
Look at the data (29 rows)
| Date (UTC) | Daily mean |
|---|---|
| Aug 28, 2026, 12:00 AM | 190 CFS |
| Aug 29, 2026, 12:00 AM | 186 CFS |
| Aug 30, 2026, 12:00 AM | 192 CFS |
| Aug 31, 2026, 12:00 AM | 189 CFS |
| Sep 1, 2026, 12:00 AM | 179 CFS |
| Sep 2, 2026, 12:00 AM | 169 CFS |
| Sep 3, 2026, 12:00 AM | 161 CFS |
| Sep 4, 2026, 12:00 AM | 155 CFS |
| Sep 5, 2026, 12:00 AM | 150 CFS |
| Sep 6, 2026, 12:00 AM | 146 CFS |
| Sep 7, 2026, 12:00 AM | 140 CFS |
| Sep 8, 2026, 12:00 AM | 136 CFS |
| Sep 9, 2026, 12:00 AM | 138 CFS |
| Sep 10, 2026, 12:00 AM | 149 CFS |
| Sep 11, 2026, 12:00 AM | 141 CFS |
| Sep 12, 2026, 12:00 AM | 135 CFS |
| Sep 13, 2026, 12:00 AM | 134 CFS |
| Sep 14, 2026, 12:00 AM | 133 CFS |
| Sep 15, 2026, 12:00 AM | 130 CFS |
| Sep 16, 2026, 12:00 AM | 127 CFS |
| Sep 17, 2026, 12:00 AM | 125 CFS |
| Sep 18, 2026, 12:00 AM | 124 CFS |
| Sep 19, 2026, 12:00 AM | 125 CFS |
| Sep 20, 2026, 12:00 AM | 123 CFS |
| Sep 21, 2026, 12:00 AM | 161 CFS |
| Sep 22, 2026, 12:00 AM | 134 CFS |
| Sep 23, 2026, 12:00 AM | 121 CFS |
| Sep 24, 2026, 12:00 AM | 121 CFS |
| Sep 25, 2026, 12:00 AM | 121 CFS |
About this gauge
Official USGS station
Get Water Data organizes provisional public monitoring data from the U.S. Geological Survey.
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