Ladd’s Addition Green Street and Sewer Project

Sewer and Stormwater
Environmental Services has completed design of a project that will install and upsize public sewer pipes, as well as construct green street planters, within the Ladd’s Addition neighborhood. These improvements will increase sewer capacity, relieve sewer backups, and reduce street flooding.
Project design is complete. Construction is anticipated to begin as soon as January 2022.

Project Area

The map below illustrates where this project will construct sewer improvements, green street planters, and new ADA ramps. The map also shows the methods of construction proposed.  

Ladd's Addition Sewer and Green Street Project

Schedule Change

This project will be constructed along with the Sunnyside South project nearby.  Information about the Sunnyside South Project is available at the project website here:

Due to the complexity and size of these two projects, there is need for additional work to ensure that Environmental Services is coordinating effectively with other public utilities and City bureaus.  This will ensure that underground utilities are protected, proper permits are received, and that necessary materials and crews are available to complete the work in a timely manner.

Construction is anticipated to begin in the summer of 2022 and may take about a year and a half to complete. A year and a half is for the entirety of the Ladd’s Addition and Sunnyside South projects. The work will be done in phases, with crews moving from one location to another throughout the project. When construction begins, the contractor will prepare regular schedule updates.  We won’t have specific schedule information until a contractor is selected in the Spring/Summer of 2022.  We recommend that residents sign up for regular email updates to receive more detailed schedule updates.     

Pre-Construction Activities

Over the next several months, you may see crews preparing for construction next year. Activities may include cleaning and inspecting sewer pipes and maintenance access holes; locating underground utilities and marking them with paint or small flags; documenting pre-existing conditions with photos of streets, curbs, sidewalks, and driveway aprons; placing tree protection fencing and erosion controls; staging equipment and materials; and setting up traffic controls. These activities will not occur all at once, and some of them will occur throughout the project as construction crews move from one location to another.

We Want to Hear From You

Please let us know if you have any questions regarding the sewer pipes or green street planters. Be sure to include your name, property address, and project name (Ladd’s Addition) in your voicemail and email so we can provide you more details about what to expect in front of your property. Also, please write “Ladd’s Addition” in the subject line of your email.

Construction Methods

The city plans to use two different methods to construct this project:

  • Open trench excavation is the most traditional and most common method of sewer construction. This method consists of excavating down to and exposing the existing pipe (if there is one), so that it can be installed, repaired, or replaced. The trench is then backfilled and temporarily paved until the pipe is quality control tested.
  • Cured-in-Place Pipe Lining (CIPP) is a trenchless method of sewer construction. It requires little or no digging and significantly less time to complete than other sewer repair methods. CIPP involves inserting a flexible liner inside the existing pipe, inflating the liner, and exposing it to heat or ultraviolet light to “cure,” or harden the liner inside the pipe.

For more information about construction methods, go to

Project Background

The purpose of this project is to relieve basement sewer backup risk, reduce street flooding, and overall risk to the large sewer trunk in the project area. To that end, this project will upsize or repair portions of the public sewer main line to increase its capacity to handle combined sewer and stormwater. It will also build green street planters that help slow, filter, and cleanse stormwater from the streets.   

The project is designed to accomplish the following sewer and stormwater improvements:  

  • Relieve basement sewer backups at 59 properties.  

  • Replace or repair 3,500 feet of public sewer mainline pipe, ranging in size from 8 inches to 14 inches in diameter.  

  • Construct 15 green street planters. 

  • Construct or replace 9 sewer service laterals that connect private sewer lines to the public sewer in the street; this will involve 300 feet of lateral sewer pipe.  

  • Construct or replace 15 manholes.  

  • Replace 6 storm drain inlets and construct 336 feet of inlet lead pipe.

  • Construct 11 ADA ramps.

Sign Up for Updates

Sign up for weekly email or text message updates for the Ladd's Addition Green Street and Sewer Project through our free GovDelivery subscription service. These updates are the best way to stay informed about what’s happening and what to expect. You can also sign up for bulletins on other projects and topics.