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Ladd’s Addition Green Street and Sewer Project

Sewer and Stormwater
Environmental Services will begin construction on 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.
Construction is anticipated to begin as soon as mid-September and may take about a year and a half to complete work in both Ladds Addition and Sunnyside neighborhoods.

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


This project will be constructed along with the Sunnyside South project nearby. Construction is anticipated to begin as soon as mid-September and may take about a year and a half to complete work in both areas. Learn more about the Sunnyside South Project.

We do not have a construction schedule at this time to let you know the sequence of work locations. The city’s contractor will provide advance notice to adjacent properties before construction begins at each work zone.  

What’s Happening Now

You may see crews conducting pre-construction activities a few weeks or days before sewer construction begins there. Activities may include inspecting pipes and manholes, marking underground utilities with paint on the street or flags in the ground, trimming trees and installing tree protective fencing, setting up traffic controls, installing vibration and settlement monitoring equipment, setting up erosion controls, staging equipment and materials, and other activities as needed. For more information on these pre-construction activities, visit Pre-Construction Activities.

What to Expect During Construction

A brief guide on what you can expect during construction projects conducted by Environmental Services and their contractors can be found at Construction Impacts.

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.

Learn more about construction methods.

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.

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