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Hydrograph River at a Glance Download
Osage River at Mari-Osa Campground Stage (ft)Observed: 14 ft at 10:00AM May 21, 2020Observed: 11.6 ft at 7:00AM May 23, 2020Observed: 11.5 ft at 9:00AM May 24, 2020Observed: 11.4 ft at 7:46AM May 25, 2020Observed: 13.8 ft at 10:00AM May 26, 2020Highest Observation: 16.8 ft at 12:00PM May 27, 2020Forecast: 17 ft 1:00AM May 28, 2020Forecast: 17.2 ft 7:00AM May 28, 2020Forecast: 17.5 ft 1:00PM May 28, 2020Forecast: 17.6 ft 7:00PM May 28, 2020Forecast: 17.8 ft 1:00AM May 29, 2020Forecast: 18.1 ft 7:00AM May 29, 2020Forecast: 18.3 ft 1:00PM May 29, 2020Highest Forecast: 18.4 ft 7:00PM May 29, 2020Forecast: 18.2 ft 1:00AM May 30, 2020Forecast: 17.6 ft 7:00AM May 30, 2020Forecast: 16.8 ft 1:00PM May 30, 2020Forecast: 16.4 ft 7:00PM May 30, 2020Forecast: 16 ft 1:00AM May 31, 2020Forecast: 15.7 ft 7:00AM May 31, 2020Forecast: 15.4 ft 1:00PM May 31, 2020Forecast: 15.1 ft 7:00PM May 31, 2020Forecast: 14.8 ft 1:00AM Jun 01, 2020Forecast: 14.5 ft 7:00AM Jun 01, 2020Forecast: 14.3 ft 1:00PM Jun 01, 2020Forecast: 14 ft 7:00PM Jun 01, 2020MOAM7(plotting HGIRZ) Graph Created (7:10PM May 27, 2020)ObservedForecast (issued 10:04AM May 27)Latest observed value: 16.8 ft at 12:00 PM CDT 27-May-2020. Flood Stage is 19 ft
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Tabular Data (CDT)
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Datum: NAVD88
NOTE: 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.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Osage River at Mari-Osa Campground are issued as needed during times of high water, but are not routinely available.

Vertical datum height surveyed by the NWS

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Upstream Gauge - near St. Thomas Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 25
Moderate Flood Stage: 22
Flood Stage: 19
Action Stage: 17
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

For more information on your flood risk go to

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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
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28.5 A multi-story home across the river and downstream from the gage will begin flooding near this height.
27 Numerous campsites, garages, and sheds on both sides of the river become flooded near this height.
25.4 A house directly across the river from the gage begins flooding near this height.
25 Across the Maries River from the gage, considerable cropland becomes inundated. This flooding probably begins between 20 and 23 feet.
24 A storage shed across the river and downstream of the gage begins flooding near this height. Also, lower driveways across the river begin flooding near this height.
22 A storage shed across the river from the gage begins flooding near this height.
20 Near this stage the lowest two campsites at Mari-Osa campground begin flooding.
(1) Lower sectional staff gauge on the Osage River at the Mari Osa Delta campground.
(2) Middle sectional staff gauge on the Osage River at the Mari Osa Delta campground.
(3) Upper sectional staff gauge on the Osage River at the Mari Osa Delta campground.
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Latitude: 38.493889° N, Longitude: 92.006944° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 19 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 513.15 532.15 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
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St. Louis Weather Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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Page last modified: 1-Mar-2019 12:34 AM
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