Mitigation of Risks to Hartley Bay Water Supply Project


The Gitga'at First Nation plans to construct a 100 meter long weir – with 10 meter dam and sluice gate (3 meter high concrete dam with 1 meter parapet, and a concrete spillway and fish ladder) - in the Gabion watershed at the mouth of the Upper Gabion Lake.

The infrastructure to be constructed at the outlet of Upper Gabion Lake includes:

-              Weir;

-              Dam;

-              Fish ladder; and,

-              Necessary road works to access the site.

The purpose of the weir is to impound an additional three meters of water in the Upper Gabion Lake, allowing a controlled release of the stored water through the Gabion River system, especially during the dry summer months.

To build the weir, it is necessary to build a 5.5 kilometer road from the location of the community's water treatment plant (which is on-reserve I.R.4 and which connects to a new barge landing to accommodate machinery, equipment and supply provisions) to the mouth of the Upper Gabion Lake. The road crosses sensitive wet lands and the river, requiring 2 large span bridges and up to 50 small culverts along the route. Soil till will need to be removed and rock blasting occur to build the road. A lay down area will be required, and a small quarry will be established to provide material for the weir and dam. New road engineering and updated weir engineering will be required. Environmental studies and Dam Safety Submission will need to be updated, as well as management and monitoring plans, and negotiations with DFO for habitat compensation, if any (as this project will protect Coho fish).


Latest update

2023-3-16 – The public comment period on the project is closed. Infrastructure Canada 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


Infrastructure Canada
Moumen Kamnaksh, Environmental Review Officer
180 Kent Street
Ottawa, Ontario K1P 0B6
Telephone: 613-292-8531

  • Location

    • Mitigation of Risks to Hartley Bay Water Supply Project (British Columbia)
  • Nature of Activity

    • Water Management
    • Dams and reservoirs
  • Assessment Status

  • Start Date

  • Proponent

    Gitga'at First Nation
  • Authorities

    • Infrastructure Canada
  • Assessment Type

    Project on federal lands
  • Reference Number


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.


Nearby assessments

...within 200 kilometres
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