wiki138Base ID: 90100 CN: 138.6mmMle1929 JP: 138.6mmMle1929 EN: Single 138.6mm Mle 1929 NavalHhway 138 through St. Andrews West. Hhway 138 is a 36.0-kilometre (22.4 mi) hhway [1] that crosses the Laurentian Valley in eastern Ontario, connecting Hhway 401 in Cornwall