Martha Street Sewer Separation Phase 1 Project


Completed Date

February 2014

Cost at Completion

  • Martha Street Residential Final Construction Cost: $789,642
  • Martha Street Sewer Separation Final Construction Cost: $ 11,120,925
  • Martha Street to Riverview Lift Station Phase 1 Final Construction Cost: $ 2,020,947
  • Residential Combined Sewer Separation SEB Percentage:  5.1% (approximately $ 41,177)
  • Lauritzen Gardens Sewer SEB Percentage:  0.5% (approximately $ 41,907)
  • Lauritzen Gardens Grading SEB Percentage:  100% (approximately $ 2,326,828)

Project Location

6th Street at Dorcas Street

Project Description

The purpose of the Martha Street Sewer Separation Project was to separate combined sewer flow in a portion of the South Interceptor Basin to reduce overall flow to the downstream combined sewer system and to reduce/eliminate overflows to CSO 112 located near 1st and Martha Streets. Approximately 240 acres of the South Interceptor Basin bounded by Hickory Street on the north, the Missouri River levee on the east, Bancroft Street on the south, and South 9th Street on the west were separated as part of the project. The project was divided into two distinct areas for evaluation: the residential area and Lauritzen Botanical Gardens. Residential area work was completed in late 2012.

Lauritzen Botanical Gardens work was completed through two projects—Lauritzen Gardens Sanitary and Storm Sewer Separation and Lauritzen Gardens Storm Sewer Grading and CSO Abandonment. Construction for the Sanitary and Storm Sewer Separation Project began in Q4 2012. Construction for the Storm Sewer Grading and CSO Abandonment project began in Q1 2013.

The Martha Street to Riverview Lift Station Project is part of the LTCP South Interceptor Force Main Project. However, as this project location was in a portion of the Lauritzen Botanical Gardens, the work was done concurrently.

Construction of the Martha Street Sewer Separation Projects resulted in Missouri River water quality improvements. It decreased the overall combined sewer system flow downstream of the project location and reduced flow in the system that could eliminate CSO 112 located near 1st and Martha Streets.

Construction of the Martha to Riverview Project replaced the existing 18-inch sanitary sewer pipe from the Martha Street Diversion Structure to the Hickory Street Lift Station.

Project References

  • LTCP Project Name: Martha Street Sewer Separation Phase 1
  • Construction Contract: OPW 51880 – Martha Street Area-Residential Combined Sewer Separation (COMPLETE)
  • Construction Contract: OPW 52187 – Lauritzen Gardens Sanitary and Storm Sewer Separation
  • Construction Contract: OPW 52188 – Lauritzen Gardens Storm Sewer Grading and CSO Abandonment
  • Construction Contract: OPW 52134 – Martha Street to Riverview Lift Station Phase 1

Additional Resources