Linn Avenue Sanitary Sewer Replacement

Project ID: 
CI 15-018
Project Type:
Capital Improvement
Project Contact Information: 

Jonathan Archibald at 503.657.0891 or

Project Status: 
Project Dates: 
Construction: Fall-Winter 2016
Project Budget: 
$620,000 for Design and Construction
Linn Avenue
97045 Oregon City , OR
Barclay Hills


Temporary Closure of Linn Avenue

Design and construction in order to resolve capacity issues within the sanitary sewer on Linn Avenue between Charman Street and Pearl Street that was identified in the City’s 2014 Sanitary Sewer Master Plan prepared by Brown and Caldwell. The Sewer Master Plan recommended upsizing the sanitary sewer system to 15” for 583 feet. 

This section of roadway was also studied for reconstruction and realignment as part of the recently completed Linn Avenue Corridor Study. The topography in this area is steep and is located within one of the City’s geologic hazard areas. The corridor plan recommended the construction of a retaining wall along the east side of Linn Avenue to accommodate roadway widening.

Since the existing sanitary sewer also extends along the east side of the roadway, the City wants to identify any future issues that may result between the walls, sanitary sewer, and right of way boundaries. Therefore, a part of this project includes a complete topographic and property survey, preparation of 30% plans for the roadway reconstruction to identify the extents of the future road, and design of sanitary sewer replacements to alleviate capacity constraints and conflicts with future road improvements.

Construction of the project tentatively includes:

  • Installation of 4 concrete manholes, approximately 583 linear feet of PVC sanitary sewer pipe and connection to 4 existing structures.
  • Installation of approximately 269 feet of 16-inch HDPE sanitary sewer pipe by pipe bursting an existing 12-inch concrete pipe.
  • Replacing 7 sanitary sewer laterals to the edge of the right-of-way and connection to the new mainline.
  • Restoration of private property impacted by the replacement of laterals.
  • Construction of approximately 480 square yards of 6-inch ACP
  • Replacement of pavement markings.


Status Updates

11/17/2016: LINN AVENUE ROAD CLOSURE CONTINUING THRU 11/23/2016 - The last new manhole is being placed today, Thursday 11/16, then the final 33 feet of 15" PVC sewer main pipe can be plumbed to the existing manhole at Linn and Pearl Streets. The City has elected to allow the contractor through the end of day on Wednesday 11/23 to temporary patch the street and reopen both lanes through the Thanksgiving weekend. On Monday 11/28, work will recommence to complete 5 service line tie-ins across Linn Ave, which will require targeted traffic control and intermittent detours in the subsequent 2 weeks, kept to the absolute minimum. The street is expected to be fully re-opened overnight during the service line connections. Thank you for your patience!

11/10/2016: LINN AVENUE ROAD CLOSURE CONTINUING - The installation of the new pipeline is approximately 75% complete, however it is anticipated that the road will need to remain closed through at least 11/18 for safety reasons.

10/21/2016: TRAFFIC CONTROL CHANGE - The project has encountered a field of large boulders in the new utility trench, resulting in very slow progress, extended traffic delays, and concerns for motorist and worker safety. The City has decided to allow full closure of Linn Ave. between 4th and Pearl streets for 3 weeks, from 10/24-11/11, to allow larger excavating equipment and a less constrained work area. Please see photos on this page of the boulders encountered. A signed detour will be put in place beginning Monday, 10/24.

10/11/16: Work began on the project during the last week of September, and 269LF of 16"HDPE sewer pipe was successfully pipe burst through existing 12" Concrete pipe on 10/7/16. Crews are completing downstream electro-coupled connection to existing manhole, then commencing open-trench pipe replacement work.

7/15/16:  Design of the project is 90% complete so the project should be ready to go out to bid in August.  


1/28/2016:  Wallis Engineering was awarded the design contract for this project in December 2015, and is currently performing topographic, pipe condition, and geotechnical investigations to support the design effort.