Alert – OTTO1 – Blanchard River at Ottawa (Ohio)

June 29, 2017June 29, 2017 Matt Demczyk

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NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 72 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Blanchard River at Ottawa are issued routinely year-round.

Flood Categories (in feet)

Major Flood Stage:	30
Moderate Flood Stage:	27
Flood Stage:	23
Action Stage:	20
Low Stage (in feet):	0

Historic Crests
(1) 33.30 ft on 03/13/1913
(2) 31.40 ft on 08/23/2007
(3) 29.75 ft on 06/15/1981
(4) 29.72 ft on 02/11/1959
(5) 29.29 ft on 02/07/2008
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 23.27 ft on 12/30/2015
(2) 25.82 ft on 06/29/2015
(3) 25.88 ft on 06/17/2015
(4) 28.85 ft on 12/23/2013
(5) 27.31 ft on 04/13/2013
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -2.37 ft on 01/15/1979
(2) -1.50 ft on 02/19/1980
(3) 4.63 ft on 06/29/2012

Show FEMA’s National Flood Hazard Layers

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Zoom Level:16

Legend

FEMA Layer

	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
29	Widespread major flooding occurs throughout downtown Ottawa.
27	Flooding worsens on the south side of Ottawa, with water on several roads. Flooding also begins in other areas of Ottawa.
26.6	Flood water begins to hit the bottom of the bridge at the gage site.
25	Flooding begins along south Walnut and west Second Streets on the south side of Ottawa.
23	Lowland flooding occurs mainly in south Ottawa. Flood water also gets into low farmlands.
Photos (1) Upstream view from gauge site (2) Downstream view from gauge site

Latitude: 41.016944° N, Longitude: 84.046944° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	23 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	Not Available	Not Available	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	699 ft	722 ft

Current/Historical Observations:

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.