Ontario Highway 138

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Highway 138 shield

Highway 138
Route information
Maintained by the Ministry of Transportation
Length: 38.7 km[2] (24.0 mi)
Existed: May 1, 1967[1] – present
Major junctions
South end: 9th Street West – Cornwall
(formerly  Highway 2 east)
   Highway 401 (Exit 789)
County Road 43 – Monkland
(formerly  Highway 43)
North end: Highway 417 near Casselman
Counties: Stormont, Dundas and Glengarry United Counties
Towns: Saint Andrews, Monkland
Highway system
Highway 137 Highway 140

King's Highway 138, commonly referred to as Highway 138, is a provincially maintained highway in eastern portion of the Canadian province of Ontario. It extends from former Highway 2 in Cornwall, north to Highway 417 east of Casselman. Highway 138 provides access to the Seaway International Bridge, connecting Cornwall with Massena, New York. The highway is 38.7 km (24.0 mi) in length.

Highway 138 was first established in 1967, connecting Highway 2, now Vincent Massey Drive, with Highway 43 in Monkland. By the mid-1970s, the route had been extended north to meet with the newly opened Highway 417. Since then it has remained unchanged.

Route description[edit]

Highway 138 through St. Andrews West.

Highway 138 is a 36.0-kilometre (22.4 mi) highway[2] that crosses the Laurentian Valley in eastern Ontario, connecting Highway 401 in Cornwall with Highway 417 east of Casselman.[3]

The route begins at 9th Street West, which was Highway 2 until the late 90s, and proceeds north along the western side of Cornwall; this section is maintained under a Connecting Link agreement and is locally known as Brookdale Avenue.[4] After crossing Highway 401, at which there is an interchange, the route encounters Cornwall Centre Road, onto which it turns east. After following it for a brief distance, the highway turns north onto St. Andrews Road; the Connecting Link agreement ends at this junction.[4]

Over the next two kilometres (1.25 mi), the highway exits the fringes of Cornwall, passing through the neighbourhood of Churchill Heights. After passing Headline Road (County Road 44), the route divides a forest and then enters an agricultural area before coming upon the community of St. Andrews West. It crosses the Raisin River and continues north through a mix of farmland and forests.


Highway 138 was established by the Department of Highways on May 1, 1967, following existing Stormont County roads between Highway 2 at the Seaway International Bridge and Highway 43.[1] With the construction of Highway 417 planned and progressing eastward from Ottawa, Highway 138 was extended north to its present terminus east of Casselman in 1971 or 1972.[5][6] Its route remained unchanged from then until the mass downloading of highways, during which the southern end was truncated to Highway 401.

Major intersections[edit]

The following table lists the major junctions along Highway 138, as noted by the Ministry of Transportation of Ontario.[2] The entire route is located in Stormont, Dundas and Glengarry United Counties.[3] 

Location km[2] mi Destinations Notes
Cornwall 0.0 0.0 9th Street West Beginning of Cornwall Connecting Link agreement; beginning of former Highway 2 concurrency
0.5 0.3 Vincent Massey Drive End of former Highway 2 concurrency
2.7 1.7  Highway 401 Exit 789
4.3 2.7 Cornwall Centre Road End of Connecting Link agreement
Saint Andrews 8.9 5.5 County Road 18 (Kings Road)
Monkland 21.8 13.5 County Road 43 – Smiths Falls, Winchester, Alexandria Formerly Highway 43
North Stormont 30.6 19.0 McNeil Road / Road 22 – Dyer
32.1 19.9 County Road 15 (McLean Road) – Moose Creek
North Stormont – The Nation 38.7 24.0  Highway 417 – Ottawa
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b AADT Traffic Volumes 1955–1969 And Traffic Collision Data 1967–1969. Ontario Department of Highways. 1969. p. 114. 
  2. ^ a b c Ministry of Transportation of Ontario (2008). "Annual Average Daily Traffic (AADT) counts". Government of Ontario. Retrieved February 7, 2012. 
  3. ^ a b Ontario Back Road Atlas (Map). Cartography by MapArt. Peter Heiler. 2010. p. 52. § R68–U70. ISBN 978-1-55198-226-7. 
  4. ^ a b Contract Management and Operations Branch (2011). Highway Connecting Link List (Report). Ministry of Transportation of Ontario. 
  5. ^ Ontario Road Map (Map). Cartography by Photogrammetry Office. Ontario Department of Highways. 1971. § Q–R32. Retrieved January 2, 2010. 
  6. ^ Ontario Road Map (Map). Cartography by Photogrammetry Office. Ontario Ministry of Transportation and Communications. 1973. § Q–R32. Retrieved January 2, 2010.