Since 1855, the east and west sides of Victoria, British Columbia, have been connected by a bridge at Johnson Street. Today, work is underway to build the fourth version of the bridge—an iconic structure set to be the largest single-leaf bascule bridge (better known as a drawbridge) in Canada.
Our work on the project is part of an overall geotechnical, archaeological, and environmental subsurface investigation for the City. To date, we’ve completed geotechnical site investigations and laboratory testing for current and historical subsurface soil conditions; both on land and in the harbor. These insights will help support the design of the new bridge, which will be built to withstand an 8.5 magnitude earthquake—the highest standard for bridge design code in Canada.
As part of our contribution, we reviewed stereo air photographs and walked along the site to evaluate historical slope stability and shoreline erosion issues along with erosion protection measures. We completed detailed site investigation programs both on land and over water, and our soils laboratory in Burnaby, British Columbia, was kept busy identifying and testing samples from the bridge site.