Diana Lake Lodge is accessed off Highway #95 North of Radium, BC. Driving time from Radium Hot Springs is about 1 hour to the trailhead. Road map and directions are located here
Forest Service Roads can have extremely marginal conditions. Please read this publication from the Ministry of Forests, Lands, and Natural Resource Operations on FSR safety. A 4x4 vehicle with moderately high clearance is recommended.
BC FSR Regulations can be found here
Trail map and directions can be found here