GC-06 Sanitary Relief Phase II (12157)

GC-06 Gravois Creek to Briarstone and Gates Sanitary Relief Phase II (12157)

As part of a long-term effort to reduce basement backups and reduce sewer overflows, MSD Project Clear is designing a project to replace undersized sewers in the City of Sunset Hills near South Lindbergh Boulevard and Gravois Road. Burns & McDonnell has been selected as the Design Consultant for this project.

This project is estimated to begin construction in Spring 2024.

Project Map

Design Neighborhood Meeting

What is the goal of this project?

MSD Project Clear is investing approximately $3.5 million to design this project. The goal is to increase the size and depth of the existing sewer to increase the capacity of wastewater the pipes in this neighborhood can handle.  This will alleviate existing problems in the neighborhood resulting from undersized sewers, like wet weather building backups and overloaded sewers.

Also as a part of this project, MSD Project Clear will be removing one overflow point. These are points in the existing system where overcharged sewers can lead to untreated wastewater being released into the environment. Removing the overflow point will help protect public health and the health of our local waterways.

Project Facts

  • Construction is estimated to begin Spring 2024.
  • MSD Project Clear will replace approximately 5,000 feet of wastewater sewer.
  • The pipe size will increase to between 8 to 18-inches in diameter allowing a larger amount of wastewater to flow through the system.
  • One overflow point will be removed.

What can residents expect?

Though construction for this project is not estimated to begin until Spring 2024, it is important to be prepared for what to expect. By the Fall of 2022, residents whose property will need to be accessed to construct the project will be contacted in order to obtain necessary easements.

Type of Construction:

While the exact methods of construction will be determined as the project moves towards the Construction phase, just like with any type of construction, residents can expect to see and hear heavy equipment during the sewer excavation process. The majority of this project will be constructed by a method known as “open-cut construction”. This means that crews will dig through the surface of the ground to excavate and install pipe. To cross Gravois and Sappington Roads, crews will be “tunneling” underneath some or all parts of the roads. Tunneling will also be used West of Emil Avenue and East of Westminster Drive. This means that a tunnel boring machine will be lowered into the ground to dig through the soil and rock. Tunneling is being used in this area to minimize disturbance to the surface and impacts to traffic.

Traffic Impact: 

As a part of this project, MSD Project Clear does expect traffic impacts to roads in this area. Construction near and on Emil Avenue, Sappington Road, Gravois Road, Oakwood Manor Lane, Gates Manor Court will require temporary lane closures. More specific information including timing and locations of these closures will become available once the project has a Contractor and they can determine a set schedule.

MSD Project Clear does expect times of temporarily reduced access for properties throughout the construction of this project. However, these timings will be temporary and the Contractor will work to minimize these instances. Because Oakwood Manor Lane and Emil Avenue are all dead-end road, the Construction Contractor may construct a temporary road to maintain access to all properties throughout construction. After a Construction Contractor is selected, a traffic control plan will be developed.


After all new sewer pipes are installed, the Contractor will restore the construction site according to all District and local requirements. This could include sodding any disturbed areas, replacing disturbed pavement, reinstalling fences, etc. More detail on this will become available after a Contractor is selected for the project ahead of construction in the Spring of 2024.

What is the timeline?

This is the current tentative project schedule. This is subject to change based on a variety of factors including weather.

  • Project design completion: Winter 2022
  • Easement acquisition completion: Fall 2022
  • Estimated construction start: Spring 2024
  • Estimated project duration: 24 months


In accordance with MSD policy, the Contractor will restore all disturbed surfaces to previous or better conditions.

The Contractor will be committed to minimizing any instances of access issues to residential or commercial property.


Stay Informed

Sam Bush
MSD Project Manager

Allison White
Burns & McDonnell Project Manager

Please mention the Project Number: 12157