Rock Slide

Aerial View of Rockslide Area

On December 7, 2014, 80,000 cubic metres of rock and debris slid into the canyon blocking the Seymour River. River water levels upstream of the slide rose by 10 meters and forced the removal of Twin Bridges. In the next year Seymour Hatchery staff and volunteers continually monitored adult and juvenile fish. The results found that no migration was occurring upstream or downstream of the slide area!

In the fall of 2015 two engineering firms were hired to determine the best way to reduce the slide debris to enable greater water flows and fish migration. Seven different recommendations were made. A Roundtable was formed with all the stakeholders and partners to decide on one of the recommendations. The partners decided on drilling and rock breaking over a 2 – 5 year period as the best way to restore migration for all species on the Seymour River.

Since then, Seymour Salmonid Society, has taken the lead in managing and fundraising for the rockslide mitigation project.

We would like to acknowledge and thank our funding partners and stakeholders, including:

Metro Vancouver
Dept of Fisheries & Oceans
The Province Newspaper
District of North Vancouver
City of North Vancouver
Habitat Conservation Trust Fdn.
Freshwater Fisheries Society of BC
Steelhead Society
Coho Society
Supersave Group
Tseil-Waututh First Nations
Squamish First Nations


Rockslide Project Timeline

  • 2021 | September

    Work on the slide in 2021, took place for a month, starting in August and commencing in the

  • 2020 | December

    In February 2020, the same high water event that destroyed the fish fence, also moved the "house rock".

  • 2019 | December

    This year (2019) represented the 4th year of the project and we targeted 6 to 8 weeks of

  • 2018 | June

    The rockslide opening ceremony marked the start of the third year of operations adjacent to the rockslide on

  • 2016 | October

    Low velocity rock breaking in the Seymour River Canyon. Slow motion video of some of the first explosions.

  • 2016 | August

    Project partners and funders gather at the slide site to celebrate to beginning of the rock breaking and

  • 2016 | July

    Danger tree removal for site safety.

  • 2016 | March

    This article featured in the 24 Hour Newspaper on March 18th, 2016. It highlights the incredible number of

  • 2015 | January

    Public access to the slide area and Fisherman's Trail are restricted to ensure scene safety. Walking and biking

  • 2015 | November

    Fish are trapped, carried in backpacks up 140+ stairs and then trucked to the hatchery upstream.

  • 2014 | December

    Rock slide occurs in the lower portion of Seymour River threatening all progress since the hatchery began operations