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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via, as described in the StoryMap here.

Hydrograph River at a Glance Download
Maumee River at Grand Rapids Stage (ft)Flow (kcfs)Highest Observation: 0.84 ft at 7:00AM Sep 21, 2023Observed: 0.82 ft at 8:00AM Sep 22, 2023Observed: 0.83 ft at 7:00AM Sep 23, 2023GRRO1(plotting HGIRZ) Graph Created (12:02AM Sep 24, 2023)ObservedLatest observed value: 0.83 ft at 7:00 AM EDT 23-Sep-2023. Flood Stage is 17.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NAVD88
NOTE: Forecasts for the Maumee River at Grand Rapids 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 - at Napoleon Upstream Gauge Downstream Gauge Downstream Gauge - at Waterville
Flood Categories (in feet)
Major Flood Stage: 19.5
Moderate Flood Stage: 18.5
Flood Stage: 17.5
Action Stage: 11
Low Stage (in feet): -9999

Historic Crests
(1) 25.00 ft on 03/07/1904
(2) 23.50 ft on 03/26/1913
(3) 22.75 ft on 03/05/1979
(4) 22.75 ft on 02/12/1959
(5) 22.75 ft on 03/14/1982
(6) 20.81 ft on 03/15/1982
(7) 19.96 ft on 03/23/1978
(8) 19.67 ft on 12/31/1985
(9) 19.50 ft on 03/11/2009
(10) 19.33 ft on 02/08/2008
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 19.20 ft on 06/30/2015
(2) 15.90 ft on 03/02/2011
(3) 19.50 ft on 03/11/2009
(4) 17.50 ft on 02/12/2009
(5) 19.30 ft on 02/09/2008
(6) 19.33 ft on 02/08/2008
(7) 16.00 ft on 08/23/2007 (P)
(8) 16.00 ft on 08/23/2007
(9) 15.35 ft on 01/16/2007
(10) 19.09 ft on 01/15/2005
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:16
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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
If you notice any errors in the below information, please contact our Webmaster
22 Major flooding to urban and agricultural areas with widespread damage to public facilities and private property. The downtown business district inundated. Second and Front Street homes and businesses flooded with a couple of feet of water mainly on the west side of town.
20 FEMA 0.2 percent flood level. The dike protecting Grand Rapids is overtopped and several businesses inundated. Water threatens the railroad bridge upstream where it crosses Wapakoneta Road.
19.5 Front Street inundated. Numerous farm fields and parking lots flooded. Businesses threatened in Grand Rapids.
18.5 FEMA 1 percent flood level. Mary Jane Thursten State Park Campground inundated. Homes in Wood County cut off from emergency access. Portions of route 24 inundated. The metropark facilities inundated.
18 Water starts to cover Front Street just west of the Grand Rapids business district over portions of Beaver, West, and Mill Streets. Campgrounds along the river are under water.
17.5 Flood waters inundate Grand Rapids Road cutting off access to a few homes. Mill Street access on the east end of Front Street Flooded. Route 24 threatened by rising flood waters. Water can back up through storm drains causing flooding on the south side of Grand Rapids.
16.5 Low lying land near Grand Rapids floods.
15 The metropark in Grand Rapids floods and the park service road inundated.
12 Bankfull stage.
11 The river level is hazardous to recrational users.
About This Location Collapse

Latitude: 41.414167° N, Longitude: 83.860833° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 17.5 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 624.93 642.43 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  
Additional Information Collapse
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) 10 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.

See the Product Description Document link for more details on the interpretation of the 10 day graphics.

Click individual graphics to enlarge.

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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
Cleveland Weather Forecast Office
925 Keynote Circle, Suite #314
Brooklyn Heights, OH 44131
(216) 416-2900
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Page last modified: 2-Nov-2020 7:30 PM
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