Public Information Statement
Issued by NWS St. Louis, MO
NOUS43 KLSX 052140
SERVICE CHANGE NOTICE
NATIONAL WEATHER SERVICE ST LOUIS MO
440 PM CDT THU MAY 05 2016
To: Family of Services /FOS/ subscribers,
NOAA Weather Wire Service /NWWS/ subscribers,
Emergency Managers, Weather Information Network
/EMWIN/ subscribers, NOAAPORT subscribers,
other National Weather Service /NWS/ users and
partners, and NWS employees
From: Mark Fuchs
Subject Change in flood stages for the Meramec River at
Eureka, Missouri effective today.
Effective immediately, the National Weather Service will update
flood stage and moderate and major flood stages for the Meramec
River at Eureka, Missouri.
Last July, the United States Geological Survey moved this river gage
from its previous location along the old Route 66 bridge at the
Route 66 State Park Visitors Center a short distance upstream to
near the I-44 bridge. Initially, it was believed this change would
not significantly change the resulting stages during high flows,
based on typical water surface slopes along the Meramec River.
However, during the historic flooding last December, USGS personnel
determined the river crest heights sloped about a foot from the new
site to the previous site at all flow regimes.
With the higher stage readings, the National Weather Service must
now adjust its levels of impact and associated flood stages. This
means the new flood stage for this gage is now 19 feet, replacing
the previous flood stage of 18 feet. The new moderate flood stage
is 26 feet, replacing the previous moderate flood stage of 25 feet.
The new major flood stage is 31 feet, replacing the previous major
flood stage of 30 feet.
Flood stage is the river level at which minimal human impact from
floodwater begins, and the level at which the National Weather
Service will begin issuing river flood warnings. Moderate flood
stage is the level at which numerous secondary roads and
outbuildings begin flooding. Sometimes, moderate flooding can
impact homes or businesses near a stream. Major flood stage is the
level at which primary roads, highways, residences, and businesses
Additional information about the affected impacts at this site can
be found at:
The National Weather Service welcomes public feedback. If you have
any questions or comments about these service changes, please
National Weather Service Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
Phone: (636) 447-1876