• In terms of miles of sewer pipe, the system that MSD manages is the 4th largest in the United States and portions of the sewer system still in use today were first built as far back as the 1850s.  To give some perspective on how large and complex a sewer system this is, consider that MSD’s system is approximately the same size as the system in Los Angeles, California.  Although the two systems are approximately the same size, system upgrades and operational costs in Los Angeles are shared amongst over 5 million residents versus approximately a combined 1.4 million residents in the City of St. Louis and St. Louis County.  Furthermore, the St. Louis system is an older system that is significantly more complex due to its age and the fact that 79 separate sewer systems have been incorporated into one over the last several decades.
  
  
  • MSD operates more than 9,600 miles of sewer lines
    
    
    • 2,980 miles of stormwater sewers
    • 4,741 miles of sanitary sewers
    • 1928 miles of combined sewers
      
      
  • MSD processes more than 330 million gallons of wastewater every day at it’s 7 treatment plants
    
    
• MSD is responsible for the control of the existing approximately 240 SSOs and 200 CSOs (refer to maps below for locations)
  

Below you can see the entire Coldwater Service Area with the treatment plant, trunk sewer and tank locations indicated. We will use wet weather storage tanks to relieve the Coldwater Creek trunk sewer from New Halls Ferry Road to south of Interstate 70 (the portion highlighted in yellow).

Recent and ongoing work in the service area include: Treatment plant expansion, a trunk sewer relief from the treatment plant to New Halls Ferry Road, several sewer relief projects, rehabilitation of sewers and Inflow and Infiltration reduction.

Wet Weather Storage Facility in St. Ann

The facility will be approximately 185 feet in diameter and hold up to 6.5 million gallons of water that would otherwise be diverted into Coldwater Creek.

Residential Property included in the voluntary buy-out

Presentation given at St. Ann Community Center on July 2, 2008:

St. Ann Wet Weather Storage Facility Presentation

If you have any questions regarding this project, please contact Jeff Shiner at (314) 768-2796, or jkshin@stlmsd.com.