What is now PTH 77 began in 1961 as an unnamed gravel road running from PTH 10 and extending as far west as the community of
Powell along the northern boundary of the
Porcupine Provincial Forest, switching to dirt at
Baden. By 1963, it had been improved to a two-lane gravel road in its entirety, as well as being extended further west past the hamlet of
Westgate to the
Saskatchewan border, where it continued towards
Armit as the newly opened
Saskatchewan Highway 3 (Hwy 3). The highway was officially designated as
Provincial Road 277 (
PR 277) in 1966, as well as gaining a short spur to the community of
Red Deer Lake. Becoming fully paved by 1983, the highway was officially re-designated as PTH 77 in 1987, with the route changing very little since then. ==Major intersections==