South Sanitary Sewer Interceptor Replacement

South Sanitary Sewer Interceptor Replacement

Project Manager

Water Utilities Engineering / David Barth, P.E.

SUA Project No. 16SG02

Visit the GIS Infrastructure Map to see where city infrastructure projects are happening.

What We're Doing

The City of Stillwater and Stillwater Utilities Authority is replacing the South Sanitary Sewer Interceptor (SSSI), two creek crossings, rehabilitating the Foxfire Lift Station, and abandoning the Squires Landing Lift Station. 

Anticipated Milestones

  • Anticipated Date (Design): FY20
  • Anticipated Date (Construction): FY22
  • Anticipated Date (Completion): FY24

Benefits of the Project

The South Sanitary Sewer Interceptor (SSSI) immediately upstream of the Waste Water Treatment Plant is a combination of 42 inch and 36 inch diameter reinforced concrete pipe. Video inspection of the SSSI shows significant deterioration that contributed to a pipe collapse in 2015. Rehabilitation of the Foxfire Lift Station and abandonment of the Squires Landing Lift Station will improve our system efficiency and reduce operational expenses.

Budget & Funding

  • Year Funded: FY2017
  • Funding Source: Wastewater Fund
  • Project Budget: $333,000 for design
  • Expenditures to date: $50,000

Project Management


June 26, 2017: Tetra Tech has been selected for design services and project scope is currently being developed.

October 18, 2017: Data is currently being collected using flow monitors and the design will continue through the summer of 2018.

February 27, 2018: Engineering firm, Tetra Tech, is currently evaluating design alternatives.

June 18, 2019: Project was on hold due to other capital improvement priorities. Study phase will start again in July.

Actions Authorized by Stillwater Utilities Authority (SUA)

  • 10.2.17  | SUA-17-34 |  Professional Services Agreement


(Sewer trunk line showing heavy erosion)

View looking inside sewer 36 inch trunk line showing loss of mortar.