Royal Engineers' Road at Alexandra Bridge

The Royal Engineers' Road is significant for its historical, cultural, and material values, particularly for its historical role as a Hudson's Bay Company trading route and later the Cariboo Road, which was instrumental in accessing the Fraser River and Cariboo goldfields and opening up the interior of British Columbia. It is important as part of a series of trails that were intended to link Fort Langley with the interior of British Columbia after the loss of the southern route through part of the United States in the wake of the Oregon Treaty of 1846.

The Royal Engineers' Road at Alexandra Bridge is a rare surviving example of the physical infrastructure specified by the Royal Engineers, particularly its specifications for maximum grade and width. It is also important temporally, as the original trail became part of the Cariboo Wagon Road, and later, the 1926 highway which connected with the Alexandra Bridge on both the east and west sides of the Fraser River. The trail has historical associations with the bridge crossings at this location in the Fraser Canyon, including an early rope bridge, and both Alexandra bridges.

As an engineering feature, the trail is valued for its design, slope and alignment, a response to the steepness of the Fraser Canyon at this point combined with a need to preserve a traversable grade. It is also important for the landscape manipulation and dry rock, and later, concrete retaining structures required to create and maintain the trail grade.

The road is culturally significant for its association with the British Colonial Office's Columbia Detachment of the Royal Engineers, who made the first post-contact attempt to establish a land route through the Fraser Canyon.

The trail has important recreational value as part of a scenic walking route based on early trails and roadway, and as part of future trail networks in the region.