City completes cost estimate for Colliery Dam Park auxiliary spillway


The following update provides cost information associated with the work taking place at the Lower Dam in Colliery Dam Park supporting the construction of an auxiliary spillway flood mitigation solution.

Work at the site began at the end of September 2015 and is scheduled to be completed in April 2016. Due to a limited timeframe during which the spillway could be built, detailed design drawings and specifications were developed in conjunction with active construction. Initial estimates placed the total cost for the project as ranging between $2.8 and $4.6 million.

The complete cost estimate to finish the project on schedule has now been determined with a final cost projected at $4,546,000. A number of factors contributed to the cost nearing the upper end of the initial estimate, including engineering supervision/environmental monitoring during the seven-month project and additional engineering /consultant analysis relating to site conditions.

For the complete list of project costs to date and estimated final costs, please see the background information included with the online version of this news release.

Strategic Link: N/A

Key Points

  • A cost estimate of $4,546,000 has been identified to complete the auxiliary spillway. Any adjustments to this estimate will occur monthly and will be posted to the City's website.
  • Members of the public seeking previous information or future construction updates concerning the Colliery Dams are encouraged to visit the Colliery Dams Information Page located on the City's website.


"The auxiliary spillway is scheduled to be completed in mid April, at which time the bridge over the spillway will be operational and the trail reopened and flood signage below the dams will be removed."

Director of Engineering and Public Works
City of Nanaimo


Geoff Goodall
Director of Engineering and Public Works
City of Nanaimo

Print News Release

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