Klohn Crippen Berger was retained by CN Rail to complete the redesign of the grade, track, and bridge layout and, concurrent with the construction, complete a site investigation; implement observational approach design; and monitor construction of the approach fills for an emergency bridge replacement near Mayerthorpe, Alberta that was destroyed by fire on April 26, 2016.
Service to Whitecourt and beyond was disrupted by the fire impacting business, particularly the oil and lumber industries. A critical link in the rail infrastructure, the goal was to have the line back in service within three weeks. KCB worked in close collaboration with CN Rail and other contractors to complete the investigation, design and construction monitoring to facilitate the fast tracked construction. Suspected weak foundation soils prompted the design of the embankment fills using the observational approach to adjust the design during the build. Decision made to replace the original 335m long timber trestle with approximately 50m of steel and concrete bridge and two 150m long approach fills. Together the team restored rail service on May 15, 2016.