White Head Harbour Timber Wharf (Structure # 401) Repairs

Structure 401, the primary public wharf infrastructure in White Head Harbour, is advancing in age, and due to obvious subsidence of two sections of its deck, a structural assessment was carried out in order to assess its current condition. Inspection of Structure 401 identified failure of the south end of the bottom cribwork portion due to undermining of the timber crib. Severe deterioration of the bolted connections, loss of horizontal face timbers and decay of crosstie member ends have all contributed to the structure's current poor state. Immediate temporary repairs for stabilization of the structure are required at the south end of structure 401. The lower cribwork section has potential for complete failure.

The lateral stability of the treated timber pile bent trestle structures are currently structurally compromised due to failed bolts at the trestle bracing, corroded connections of the battered A-frame piles, and deteriorated ballast boxes. This project will replace A-frame steel connection plates, timber sheathing, access ladders, timber blocking where required, approximately 30 fender piles, 8 ballast boxes and add approximately 275 tonnes of rock protection around the structure's base.

To ensure there is no further subsidence of structure 401, concrete blocks will be installed around it's base and concrete tremie poured under the crib extending out to the newly installed concrete blocks. Rip-rap will then be placed completely covering this new support base.

With the stabilization of Structure's 401 base and repairs made to it's lateral bracing system, the wharf has an expected remaining service life of three to five years. Further extension of the useful service life of Structure 401 will require major reconstruction. The treated timber piles are in suitable condition to be incorporated in a reconstruction of this section, assuming a similar braced pile bent trestle system is maintained.

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Latest update

End of Public Comment Period

December 24, 2022 – The public comment period on the project is closed. Fisheries and Oceans Canada - Small Craft Harbours is considering comments received to date to inform its determination on whether carrying out of the project is likely to cause significant adverse environmental effects..

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Contacts

Fisheries and Oceans Canada - Small Craft Harbours, Maritimes and Gulf Regions
Chyann Kirby, Environmental Advisor
Gulf Fisheries Centre, 343 University Avenue
Moncton, New Brunswick E1C 9B6
Telephone: 506-866-5164
Email: chyann.kirby@dfo-mpo.gc.ca


Disclaimer

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.

  • Location

    • White Head Harbour SCH is located at 147 White Head Road, Charlotte County on the southwest shore of White Head Island, N.B. (New Brunswick)

  • Nature of Activity

    • Ports and Harbours

  • Assessment Status

    In progress

  • Start Date

    2022-11-24

  • Proponent

    Fisheries and Oceans Canada - Small Craft Harbours (DFO-SCH)

  • Authorities

    • Fisheries and Oceans Canada

  • Assessment Type

    Project on federal lands

  • Reference Number

    84123

Nearby assessments

...within 200 kilometres
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