300-400 Block North Alfred Street Combined Sewer Upsizing Project

The City is replacing portions of both the existing sanitary and combined sewers along the 300 and 400 blocks of N. Alfred Street.
Page updated on Oct 16, 2025 at 11:16 AM
Translate icon

Project Summary

Phase: Construction 

Status: Completed

Location: Braddock Road Metro Station 

Managing Dept.: Project Implementation

Sponsor Dept.: Transportation & Environmental Services

Map of Alexandria showing the location of the 300-400 Block of North Alfred Street Combined Sewer Upsizing Project.
View in Google Maps

Project Description

The City of Alexandria enhanced the sanitary and combined sewer system along the 300 and 400 blocks of North Alfred Street to improve performance and increase capacity. This upgrade addressed recurring sewer backups caused by root intrusion—where tree roots enter and obstruct aging pipes—particularly during heavy rainfall.

As part of the project, the City replaced outdated 10" reinforced concrete pipes with approximately 230 linear feet of 18” combined sanitary sewer pipe and 500 linear feet of 15” sanitary sewer pipe. Around 35 property laterals were reconnected to the new main line. The work also included installing three new 48" manholes and one 72" doghouse manhole, while maintaining four existing manholes to support long-term system reliability.

Asphalt is scored and is ready for new sewer pipe installation on the 400 block of N Alfred St
A new manhole is installed at the intersection of N Alfred St & Princess St
Contractors install the new turquoise SDR pipe in a supported trench
After the pipes and manholes are installed underground, the project finishes with road repairs, including new asphalt and striping as seen on the 300 block of N Alfred St.
When the underground work is complete, the roadway is restored with new asphalt and striping for vehicular and pedestrian safety.
When the underground work is complete, the roadway is restored with new asphalt and striping for vehicular and pedestrian safety.
of
Grid View Close Modal
Asphalt is scored and is ready for new sewer pipe installation on the 400 block of N Alfred St
Asphalt is scored and is ready for new sewer pipe installation on the 400 block of N Alfred St, looking from Princess St.
A new manhole is installed at the intersection of N Alfred St & Princess St
A new manhole is installed at the intersection of N Alfred St & Princess St.
Contractors install the new turquoise SDR pipe in a supported trench
Contractors install the new turquoise SDR pipe in a supported trench.
After the pipes and manholes are installed underground, the project finishes with road repairs, including new asphalt and striping as seen on the 300 block of N Alfred St.
After the pipes and manholes are installed underground, the project finishes with road repairs, including new asphalt and striping as seen on the 300 block of N Alfred St.
When the underground work is complete, the roadway is restored with new asphalt and striping for vehicular and pedestrian safety.
When the underground work is complete, the roadway is restored with new asphalt and striping for vehicular and pedestrian safety.
When the underground work is complete, the roadway is restored with new asphalt and striping for vehicular and pedestrian safety.
When the underground work is complete, the roadway is restored with new asphalt and striping for vehicular and pedestrian safety.

Funding

Project Budget: $780,000 

CIP Section: Sanitary Sewers

Learn more about the City of Alexandria's Fiscal Year Budget.

Schedule

  • Planning: April 2022 - September 2022
  • Design: September 2022 - October 2023

  • Construction: November 2023 - June 2025

     

Construction

Construction Update

Project construction is complete. City staff have conducted a walkthrough to certify that the repairs were executed as contracted. 

 

Community Events

The City held a pre-construction open house  at Alexandria City Hall, Sister Cities Conference Room (First Floor) in-person and virtually on Wednesday, January 22, 2025 at 6:30-7:30pm.  

Community Notice

Construction Notification Letter