Along the stretch of highway between Boston Bar and Yale are
7 tunnels, built between 1957 and 1964, as part of the Trans-Canada Highway. From South to North the tunnels are: Yale (1963), Saddle Rock (1958), Sailor Bar (1959), Alexandra (1964), Hell's Gate(1960), Ferrabee (1964) and China Bar (1961).
Following that order, driving from south to north and skipping over Saddle Rock and Sailor Bar tunnels, our fourth Benchmark is 66C125, monumented in 1966 in the west face of the north end of Alexandra Tunnel. Just like its counterpart, 66C124 on the south end of the tunnel, it's well below the words "Alexandra Tunnel" and about 6 inches above ground level.
A bit north of the tunnel is a trail leading east. That's your best best for a parking spot here.
Name Province NTS map sheet Unique Number
66C125 British Columbia 092H11 66C125
Boston Bar
Highway no. 1 alexandra tunnel (1964), 17.6 km south of rcmp station in town, 23.4 km north of bridge over yale creek in yale, 3.9 km north of north end of alexandra bridge over fraser river, 3.3 km south of coopers corner rest area, tablet in centre of northeast face of northeast concrete portal at most northerly corner of tunnel, 5.5 m northwest of centre line of highway, 1.10 m below word `tunnel', 1.00 m northwest of inside southeast face of tunnel, slightly above highway level.
From NRCAN