Metro Vancouver Maple Ridge Forcemain Scour Protection

The proposed project 

Metro Vancouver proposes to install new scour protection in an emerging scour hole in the Fraser River to protect its forcemain from continued scour. The proposed works include the extension of an existing blended rock apron located approximately 400 metres downstream of Barnston Island. The rock apron will extend approximately 26 metres upstream and downstream (52 metres in total) from the alignment of the pipe and 35 metres south towards the shoreline. The proposed blended rock apron will be 2 metres thick, with 4H:1V slope edges. Excavation of approximately 2,470 cubic metres is required to have the apron embedded into the existing riverbed. 

The total surface area of the apron will be approximately 7,120 square metres requiring 9,930 cubic metres of blended rock. Construction of the apron will include placement of the blended rock using an excavator equipped with a clamshell bucket working from a barge. The work will require two days for mobilization, one day for de-mobilization, and 20 days for in-water works. The project is anticipated to start between November 2022 and January 2023. 


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Latest update

End of public comment period 

The public comment period on the project is closed. The Vancouver Fraser Port Authority is considering comments received to help inform its determination on whether the carrying out of the project is likely to cause significant adverse environmental effects. .

Key documents

Key documents
Document Number Document Title File Date
1 Metro Vancouver Maple Ridge Forcemain Scour Protection - July 26, 2022

List all records


Project and Environmental Review
Vancouver Fraser Port Authority
100 The Pointe, 999 Canada Place
Vancouver, British Columbia V6C 3T4

  • Location

    • Metro Vancouver Maple Ridge Forcemain Scour Protection (British Columbia)
  • Nature of Activity

    • Ports and Harbours
    • Other, not otherwise specified
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Metro Vancouver
  • Authorities

    • Vancouver Fraser Port Authority
  • Assessment Type

    Project on federal lands
  • Reference Number


Nearby assessments

..within 200 kilometres
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