Beginning December 3, 2012, the National Weather Service (NWS) Chicago Forecast Office will begin providing river forecast and flood warning services for the West Branch DuPage River at the U.S. Geological Survey (USGS) river gage near Warrenville IL.
Flood warnings will be issued when river levels are expected to reach or exceed flood stage. Flood stage will be designated as 11.5 feet. Flood advisories will be issued when water levels are expected to reach 11 feet. Flood stage and flood impact levels should be considered provisional and may be modified at a later date based on updated field observations or other supporting data.
It should also be noted that according to the USGS, the physical location of the Warrenville gage was changed in 2010. The current gage location is about one-third mile downstream from the previous location. The increase in drainage area is very small, thus discharge values at the two locations can be considered equal to each other. However, as a result of location specific channel characteristics, channel slope, and the existence of the Warrenville grove dam between the two locations, gage height (water level) values at the new location should not be compared to values from the previous location.
River forecast and flood warning information is available from the NOAA NWS Advanced Hydrologic Prediction Service (AHPS) page by clicking on the Rivers and Lakes link on the NWS Chicago website under the Hydrology/ Rivers and Lakes link on the left hand menu.
River flood information is also broadcast on NOAA Weather Radio.
If you have any questions please contact:
National Weather Service Forecast Office
333 W University Drive
Romeoville, IL 60446
Phone: 815-834-0600 X493