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FloodSmart
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Visit https://www.weather.gov/owp/operations for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information.

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Hydrograph River at a Glance Download
Osage River at Mari-Osa Campground Stage (ft)Observed: 5 ft at 1:00PM Mar 20, 2023Highest Observation: 7 ft at 1:00PM Mar 21, 2023Observed: 4.5 ft at 1:00PM Mar 23, 2023MOAM7(plotting HGIRZ) Graph Created (10:25PM Mar 26, 2023)ObservedLatest observed value: 4.5 ft at 1:00 PM CDT 23-Mar-2023. Flood Stage is 19 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: 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.

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
(1) 30.30 ft on 12/29/2015
(2) 30.20 ft on 06/06/2019
(3) 27.90 ft on 05/04/2017
(4) 23.00 ft on 06/28/2021
(5) 22.80 ft on 03/19/2021
(6) 22.50 ft on 01/11/2020
(7) 22.50 ft on 03/31/2019
(8) 22.10 ft on 12/18/2015
(9) 21.60 ft on 05/30/2020
(10) 21.40 ft on 10/11/2019
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 23.00 ft on 06/28/2021
(2) 20.30 ft on 04/12/2021
(3) 22.80 ft on 03/19/2021
(4) 20.30 ft on 06/10/2020
(5) 19.00 ft on 06/05/2020
(6) 21.60 ft on 05/30/2020
(7) 19.50 ft on 03/23/2020
(8) 21.20 ft on 03/20/2020
(9) 22.50 ft on 01/11/2020
(10) 21.40 ft on 10/11/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -1.00 ft on 01/17/2022
(2) 0.30 ft on 02/19/2018

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:16
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Gauge LocationGauge Map Marker
 Disclaimer
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
If you notice any errors in the below information, please contact our Webmaster
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.
Photos
(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.
About This Location Collapse

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)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 513.15 ft 532.15 ft 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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Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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
National Weather Service
St. Louis Weather Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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