west of ottawa, a route was assumed to arnprior on october 6, following today's carling avenue, march road and donald b. munro drive between ottawa and kinburn, and kinburn side road and madawaska boulevard between kinburn and arnprior. on june 15, 1921, the highway was extended to pembroke via renfrew, cobden, and beachburg. the entire route between pembroke and pointe-fortune became known as highway 17 in the summer of 1925.