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St. Marys River near Fort Wayne, IN (SASI3)

Data Type




Inundation Levels
NAVD88 Stage

770.5*22.0*
Record Crest: 21.2 ft
769.521.0
768.520.0
Major Flooding Begins

767.519.0
766.518.0
Moderate Flooding Begins

765.517.0
764.516.0
763.515.0
Minor Flooding Begins

762.514.0
761.513.0
Near Flooding Begins

760.512.0
Below Flooding Begins

* = Extended rating
Weather Forecast Office Northern Indiana, IN Ohio River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
3.2 ft at 01/28/2023 21:30:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
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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.

Gauge Information Collapse

Map Overlays
Flood Categories (in feet)
Major Flood Stage: 19
Moderate Flood Stage: 17
Flood Stage: 14
Action Stage: 12
Low Stage (in feet): -9999

Historic Crests
(1) 21.20 ft on 07/09/2003
(2) 19.88 ft on 06/19/2015
(3) 19.66 ft on 03/14/1982
(4) 19.06 ft on 01/14/2005
(5) 18.33 ft on 02/26/1985
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 12.91 ft on 07/17/2021
(2) 13.21 ft on 01/12/2020
(3) 15.27 ft on 04/29/2019
(4) 15.27 ft on 04/29/2019
(5) 12.73 ft on 02/21/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.77 ft on 10/04/2008
(2) 0.78 ft on 06/29/2012
(3) 0.80 ft on 10/29/1999
Show More Low Water Records

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

Site-specific information:
These maps were prepared in cooperation with the USGS Indiana Water Science Center and the City of Fort Wayne.

U.S. Geological Survey (USGS) Flood Inundation Mapping Technical Report

Extended rating:
Rating Curve Extension - The Rating Curve Extension is calculated by using either a linear, logarithmic, or hydraulic technique to extend the rating curve above the currently established relationship between stage and flow.
Flood Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
22 Structural damage is done to homes and businesses on the south side of Fort Wayne near the Saint Mary's River. Record flood was set on July 9, 2003 when the river reached 21.2 feet.
20 A major flood is in progress and water is nearing the top of many levees.
19 Flooding reaching major category with isolated evacuations becoming necessary. Some roads and bridges are closed at this level.
18 An increasing number of city streets flood, and evacuations may become necessary. Property damage begins in more areas at this level.
17 Some residents in the Winchester Road area may need to be evacuated. Property damage begins in some areas at this level.
15 Flooding occurs on the lowest unprotected city streets, park drives and county roads.
14 Flooding occurs in parks and low farmland throughout southern Allen County. The City of Fort Wayne starts 24 hour flood fighting procedures.
Photos
(1) Upstream view from gauge site
(2) Downstream view from gauge site
Other Data Sources Collapse
Additional Information Collapse
Gauge zero transitioned from 748.97 NGVD29 to 748.41 NAVD88 on July 25, 2012. Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 10 Day (NAEFS) River Forecast VS. River Potential
HEFS Ensemble NAEFS Ensemble Outlook vs. Forecast

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

To use the USGS flood inundation mapper tool, please visit the following web address: http://wim.usgs.gov/FIMI/FloodInundationMapper.html
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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.
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.