ride east up behind Pioneer Lodge past the tennis courts on your left. the double track becomes more defined
"From Boise's north end (at the intersection of Hill and Bogus Basin roads), travel north up Bogus Basin road about 16.5 miles.the pavement ends at lower (main)parking lot near Bogus Creek Lodge. Proceed on the Boise Ridge Rd. Where the sandy surface turns to pavement as it leavesthe main ridge rd.and splitsright, up through a series of switch backs to the Pioneer Lodge milage starts here
http://www.singletracks.com/item.php?c=1&i=118