Big River at Byrnesville
Missouri — Water Level & Flood Stage
Located in Jefferson County, Missouri on the Big River. Live water level data from USGS gauge 07018500, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
28 ft
Moderate Flood
20 ft
Minor Flood
16 ft
Action Stage
13 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
30.3 ft
The porch of the upstream left bank residence floods at this level.
29.6 ft
The main floor at the Byrnesville mill begins to flood.
29.4 ft
The floor of the gage shed begins to flood.
28 ft
At this height, several homes along Burgan Grove Road are flooded.
26 ft
Based on NWC stage-based categorical flood inundation mapping, at this height water will begin flooding the outfields of the 2 easternmost ball fields at the Northwest Jefferson County Sports Complex.
22.4 ft
At this level, Twin Rivers Bridge Road must be closed.
20.5 ft
Burgan Grove Road begins flooding near Cottage Grove Road, cutting off access to Cottage Grove Road. Highway W near Hoene Spring is closed as water crosses the pavement.
19.3 ft
South Byrnesville Road begins flooding near this level.
19.1 ft
Backyards and one basement along Burgan Grove Road 2 miles west of House Springs begin to flood.
19 ft
Dutch Creek Road south of Byrnesville and Byrnesville Road near John McKeever Road north of Byrnesville begin to flood.
18.1 ft
State Highway BB southeast of Cedar Hill will be closed near this height.
18 ft
Cedar Hill Road at Cedar Hill and Klondike Road south of Cedar Hill begin to flood near this height.
15.5 ft
Rockford Beach Park at the Highway MM bridge begins flooding.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Aug 20, 1915 | 30.2 ft | 80,000 cfs |
| Aug 20, 1915 | 30.2 ft | 80,000 cfs |
| May 1, 2017 | 30.09 ft | 62,900 cfs |
| May 1, 2017 | 30.09 ft | 62,900 cfs |
| Sep 24, 1993 | 29.37 ft | 63,600 cfs |
Flood Inundation Map
NOAA has mapped what areas flood at different water levels for this gauge. View the interactive flood inundation map →
About This Gauge
Get Flood Alerts for Big River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Big River at Byrnesville?
The Big River at Byrnesville gauge is maintained by USGS (site 07018500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Big River at Byrnesville?
The NWS-defined flood stage for Big River at Byrnesville is 16 feet. Action stage begins at 13 feet. Moderate flooding starts at 20 feet, and major flooding at 28 feet.
How do I get alerts when Big River rises?
Download StormCast free on Google Play, go to River Gauges, and add Big River at Byrnesville to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Big River at Byrnesville gauge located?
The gauge is located in Jefferson County, Missouri at coordinates 38.3917°N, 90.6378°W. USGS site number: 07018500. Data is provided by the U.S. Geological Survey and the National Weather Service.
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On This River
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.