It stretches from Highway 43 at the hamlet of Green Court, through the towns of Barrhead and Westlock, to Highway 63 east of the hamlet of Thorhild.

[1] The jog in the road skirts Thunder Lake Provincial Park to the north.

Highway 769 branches to the north towards Neerlandia, 2 km (1 mi) east of this intersection.

[3] In the 1940s it was extended northwest from Barrhead to Fort Assiniboine,[4] and then in 1960 to Swan Hills.

[6][7] Around the same time, gravel roads between Thunder Lake and Green Court were designated as Secondary Highway 918,[7] and was upgraded and paved throughout the 1980s, becoming part of Highway 18 in c. 1987.