Public Works Canada
Cape Breton Highlands
Associates Limited, Halifax N.S.
North Sydney, N.S.
During the summer of 1991. Public Works Canada rebuilt more than seven kilometres of approach roads to the summit of North Mountain, on the Cabot Trail, in Cape Breton Highlands National Park. The project called for realignment of the roadway centreline which required installing retaining walls along the steep side slopes.
Because this project was located entirely within a National Park, environ- mental considerations and the appear- ance of the final product went consider- ably beyond the standards for normal roadway construction. The Cabot Trail is one of the most scenic roadways in the country and Parks Canada wanted as little impact on this roadway as possible.
Once it had been determined that a gravity-based retaining wall was re- quired, a timber-crib wall was specified. The decision to specify timber-cribs instead of steel bin-type retaining walls was greatly influenced by the aestheti- cally pleasing natural appearance of wood.