Jefferson County - East-West Gateway Coordinating Council

A Regional Overview All-Hazard Mitigation Plan 13
Infrastructure problems included contaminated wells, collapsed wells, destroyed pumping
equipment, failed sewage treatment facilities or private septic systems, contaminated
ground and drinking water, sewage backups and treatment facilities seriously purged by
the floodwaters.
Frequency of Occurrence
The East-West Gateway Council of Governments planning region has many river and small
tributaries in both the unincorporated and incorporated areas that are susceptible to
flooding. Major floods have affected the citizens of the planning region as early as 1785.
Table J28 below illustrates major flood events on the Mississippi and Meramec Rivers. In
1993, 1994 and 2001, major flood events occurred in the planning region and
surrounding areas. There have been 14 major flood events since 1785. The history of river
crest levels along the Mississippi River north of Jefferson County at St. Louis helps to
illustrate the risk, severity and repetitiveness and along the Meramec River.
TABLE J28 MISSISSIPPI AND MERAMEC RIVER FLOOD STAGES NEAR JEFFERSON
COUNTY
Station Stage (Flood Stage 30 ft) Date
Mississippi River at St. Louis 42.0 4/1/1785
Mississippi River at St. Louis 40.3 7/2/1947
Mississippi River at St. Louis 40.2 7/22/1951
Mississippi River at St. Louis 43.23 4/28/1973
Mississippi River at St. Louis 39.27 12/7/1982
Mississippi River at St. Louis 39.0 5/4/1983
Mississippi River at St. Louis 33.8 4/24/1984
Mississippi River at St. Louis 33.5 4/8/1985
Mississippi River at St. Louis 39.13 10/9/1986
Mississippi River at St. Louis 49.58 8/1/1993
Mississippi River at St. Louis 36.6 4/15/1994
Mississippi River at St. Louis 41.89 5/221995
Mississippi River at St. Louis 35.35 6/2/1996
Mississippi River at St. Louis 34.79 6/10/2001
Station Stage (Flood Stage 18 ft) Date
Meramec River at Eureka 33.4 4/14/1979
Meramec River at Eureka 42.9 12/6/1982
Meramec River at Eureka 36.6 5/3/1983
Meramec River at Eureka 31.3 2/26/1985
Meramec River at Eureka 26.8 4/2/1985
Meramec River at Eureka 29.2 6/21/1985
Meramec River at Eureka 34.6 11/22/1985
Meramec River at Eureka 25.1 12/29/1987
Meramec River at Eureka 25.2 5/28/1990
Meramec River at Eureka 35.9 9/26/1993
Meramec River at Eureka 35.6 11/17/1993
Meramec River at Eureka 30.4 5/20/1995
Meramec River at Eureka 29.9 4/30/1996
Meramec River at Eureka 26.33 5/11/2002