Skip Navigation

weather.gov

NOAA - Click to go to the NOAA homepage National Weather Service Advanced Hydrologic Prediction Service NWS logo - Click to go to the NWS homepage
Navbar left image Home News Organization
Navbar End cap

Illinois River at Ottawa, IL (OTWI2)


Data Type




Inundation Levels
NAVD88 Stage

480.0480.0
479.0479.0
478.0478.0
477.0477.0
476.0476.0
475.0475.0
474.0474.0
Record Crest: 473.72 ft
473.0473.0
472.0472.0
471.0471.0
470.0470.0
469.0469.0

Major Flooding Begins

468.0468.0
467.0467.0
466.0466.0

Moderate Flooding Begins

465.0465.0
464.0464.0
463.0463.0

Minor Flooding Begins

462.0462.0
461.0461.0

Near Flooding Begins

460.0460.0
* = Extended rating
Weather Forecast Office Chicago, IL North Central River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
Loading...

Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
459.9 ft at 11/25/2017 04:30:00 UTC
Selected Inundation
Mouse Location

North Arrow

Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
What is UTC time? Map Help

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: 469
Moderate Flood Stage: 466
Flood Stage: 463
Action Stage: 461
Low Stage (in feet): -9999

Historic Crests
(1) 473.72 ft on 04/19/2013
(2) 472.21 ft on 09/16/2008
(3) 470.23 ft on 03/11/2009
(4) 468.87 ft on 12/29/2008
(5) 468.06 ft on 12/30/2015 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 464.10 ft on 07/23/2017
(2) 466.46 ft on 05/02/2017
(3) 464.33 ft on 03/31/2017
(4) 468.06 ft on 12/30/2015 (P)
(5) 467.86 ft on 06/17/2015 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

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.

Flood Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
476 Water reaches top of Illinois River levee at Ottawa High School.
475.8 Water reaches to flood protection wall on Fox River south of Main Street Bridge near Ottawa High School.
475.3 Heritage Harbor lower basements begin to flood.
474.5 Water reaches top of Fox River levee at Ottawa High School.
474 Shoreline Boat Club building will be under water. Illinois River will overtop the berm at Waste Water Treatment Plant if not sandbagged.
472 Ottawa Regional Hospital west parking lot floods.
471.5 Water reaches top of Illinois River levee at city of Ottawa Waste Water Treatment Plant.
471.3 Fox River water reaches center of YMCA parking lot.
470 St Elizabeth Medical Center in Ottawa loading dock and property are threatened. Shabbona Street near Ottawa High School floods.
468.8 Water reaches top of Fox River bank at YMCA.
468.1 River Rescue Squad threatened.
467 Green Street at Shoreline Boat Club floods.
466.4 Hudson Street River Walk near the Fox River outlet floods. Fox River Park floods. St. Clair Street floods.
465.5 Marquette High School football fields begin to flood.
465.3 Lower green spaces of Ottawa Regional Hospital begin to flood.
465 Heratige Harbor Harberwalk floods. Dock ramps can only be accessed by boat.
463.9 Water reaches top of Fox River bank at St Elizabeth Medical Center in Ottawa.
462.4 Allen Park entrance threatened and west boat ramp is submerged.
460.8 River Rescue emergency boat dock is submerged. Ottawa High School begins flood fighting.
Photos
(1) Gage equipment located on top of levee near mouth of Fox River.
(2) Looking upstream from atop levee 9/3/2009. Gage height 459.80 ft.
(3) Levee at Ottawa High School.
(4) Looking downstream from atop levee 9/3/2009. Gage height 459.80 ft.
Other Data Sources Collapse
Additional Information Collapse
How much forecast precipitation was used for the current river forecast?
Resources Collapse
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
Ask Questions/Webmaster
Page last modified: 21-Dec-2016 5:25 PM
Disclaimer
Credits
Glossary
Privacy Policy
About Us
Career Opportunities
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.