[2][3] Route 90 follows Kenaston Boulevard between the south Perimeter Highway and the Assiniboine River, through the suburbs of Waverley West, Fort Garry, and Tuxedo.

The route follows King Edward Street to the CP Carberry line underpass, after which Route 90 follows Oak Point Highway and later Brookside Boulevard before leaving the city and becoming PTH 7 approximately one kilometre south of the North Perimeter Highway (PTH 101).

Until the 1980s, it was a minor road that extended south to Scurfield Boulevard and was primarily used to access the inland cement plant and quarries located near present-day Fort Whyte.

In order to accommodate increased traffic and development in the area, Kenaston Boulevard was extended to Abinojii Mikanah in the early 2000s and later all the way south to the Perimeter Highway in 2015.

[5] Proposals currently exist to appropriate land former belonging the Canadian Armed Forces' Kapyong Barracks to widen the road between the rail crossing and the St. James Bridge.