National Weather Service Advanced Hydrologic Prediction Service

By inergency On Mar 31, 2024

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St. Marys River at Decatur

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.

NOTE: Stage may be affected by ice during winter months.

Reliability of the Forecast: Based on unobstructed flow
NOTE: Forecasts for the St. Marys River at Decatur are issued as needed during times of high water, but are not routinely available.

Flood Categories (in feet)

Major Flood Stage:	24
Moderate Flood Stage:	20
Flood Stage:	17
Action Stage:	13
Low Stage (in feet):	-9999

Historic Crests
(1) 26.92 ft on 07/09/2003
(2) 25.11 ft on 06/18/2015
(3) 24.40 ft on 03/14/1982
(4) 24.31 ft on 02/25/1985
(5) 24.22 ft on 02/10/1959
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 18.85 ft on 05/11/2021 (P)
(2) 18.92 ft on 01/12/2020
(3) 21.58 ft on 04/28/2019
(4) 18.17 ft on 02/25/2018
(5) 21.68 ft on 05/26/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.35 ft on 01/30/2000
(2) 2.35 ft on 01/29/2000
(3) 2.40 ft on 01/31/2000
Show More Low Water Records

Show FEMA’s National Flood Hazard Layers

	Gauge Location	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.

If you notice any errors in the below information, please contact our Webmaster
30.6	Flood water begins to hit the bottom of the bridge at the gage site.
27.5	Flood water reaches the 100 year flood level.
26.5	Record flooding is in progress. Evacuations are necessary in Decatur, Indiana and Wilshire, Ohio. Serious flooding of the Central Soya Plant can be expected along with widespread flooding and disruption of land transportation.
24.5	Major flooding is in progress with water at the top of the levee protecting the Central Soya Plant. US Highway 33 near Willshire, Ohio begins to flood. Extensive flooding of the east side of Decatur along with Bellmont High School occurs. Evacuations become necessary.
23.5	Many east side city streets and county roads are flooded. Evacuation of east side residents near Bellmont High School becomes necessary.
23	Portions of Ohio Routes 33, 49 and 81 are closed near Willshire.
22.5	Piqua Road begins to flood at Decatur. Evacuations begin on Ogg Street. Ohio State Route 49 near Willshire becomes flooded.
21.5	High water affects Piqua Rd…Ohio State Route 49 near the state line along with east side Decatur streets. Residential flooding begins on East Jackson and Ogg Streets. Bellmont High School grounds begin flooding.
20.5	Indiana 101 north of Pleasant Mills is closed by flood water. Extensive agricultural flooding is in progress. Residents of the east and southeast side of Decatur become concerned.
19.5	Flooding expands into more farm land in the Decatur area. Flood waters approach Piqua Road…Ohio State Route 49 and Indiana 101 just north of Pleasant Mills. Flood water begins to cross Ohio highway 49 north of Willshire, Ohio.
18.8	Flood water begins to cross Ohio Highway 49 north of Willshire, Ohio.
18.5	County Road 225 North…just north of Pleasant Mills Indiana is closed by flood water. Low land areas of Kekionga Park on the southeast side of Decatur begin flooding. Flooding is limited to farm land in Pleasant Mills Indiana and Willshire Ohio.
17.5	County road 225 north of Pleasant Mills is flooded. Agricultural land flooding increases in northern…central and eastern Adams County.
17	Agricultural flooding occurs along the river in northern…central and eastern Adams County.
Photos (1) Record flood in July 2003 around Decatur Indiana (2) More pictures of the record flooding that occurred in July 2003 around Decatur Indiana (3) More pictures of the record flooding in July 2003 (4) More pictures of the record flooding in July 2003 (5) More pictures of the record flooding in July 2003 (6) More pictures of the record flooding in July 2003

Latitude: 40.848100° N,
Longitude: 84.937700° W,
Horizontal Datum:
NAD27

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	17 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	760.12 ft	777.12 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

Current/Historical Observations:

Gauge zero transitioned from 760.44 NGVD29 to 760.12 NAVD88 on July 17, 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

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.

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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