Ladd’s Addition Green Street and Sewer Project

Sewer and Stormwater
Environmental Services is constructing a project that is installing and upsizing public sewer pipes, as well as constructing green street planters, within the Ladd’s Addition neighborhood. These improvements will increase sewer capacity, relieve sewer backups, and reduce street flooding.
Construction ongoing and will be completed by spring of 2024.

Project Area

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

Simplified map of Ladd's Addition sewer and green street project with methods of construction


Work hours are from 7 a.m. to 6 p.m., Monday through Fridays, with work possible on Saturdays if needed. The city’s contractor, Landis & Landis will provide advance notice at least 5 to 10 days to adjacent properties before construction begins at each work zone.  

What’s Happening Now

All work is weather-dependent and subject to change. 

October 2023:

The crews that work on the sewer pipes will be deploying to a more urgent job until late October/early November. There will be intermittent work in the area, but no sewer mainlines or connections until late October/early November. 

Continue Green Street Planter construction at the following locations:

  • SE Larch Ave south of Mulberry Ave
  • SE Spruce Ave southeast of Harrison St
  • SE 16th Ave south of Ladd-Tamarack Alley and Elliott-Orange Alley
  • SE 16th Ave south of 16th Ave
  • SE Tamarack Ave northwest of Lavender St
  • SE Lavender St east of Tamarack Ave
  • SE Tamarack Ave, mid-block
  • SE Ladd Ave, mid-block

Green street planters are built in phases with periods of inactivity between each phase. Excavation will happen first, then the contractor will build forms and pour concrete. Once the concrete has set, crews will return to fill the planters with soil. Plants and trees will be installed later when weather conditions are appropriate to plant. Please note: The holes that will be excavated for each green street planter will look bigger than the finished product.

Biking and Walking Near Construction

When the street or lane is closed for construction, pedestrians and cyclists can almost always use the sidewalk, but should do so with caution. Sidewalks near construction zones can become unusually congested and awareness of your surroundings can help avoid accidents. Please take extra time to walk or bike past work zones. In addition, cyclists must avoid riding on closed roadways even if it looks like there’s enough room for a bike to navigate around construction. When construction takes place on a street with a bike lane, crews will post signage to guide cyclists. For an interactive map of safe walking and biking routes in the City, Bike and Walk Maps of Portland.

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 connections 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 maintenance holes.  

  • Replace 6 stormdrains and construct 336 feet of stormdrain pipe.

  • Construct 11 ADA ramps.

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