There are several ways to get Hoheikyo-Onsen from the center of Sapporo city.
Please be noticed that the bus timetable is different between summer and winter.
Drive along R 230 from Sapporo city toward Nakayama Toge.
Pass through Jozankei Onsengai and you can see a parking lot with toilet facilities.
Keep driving a littler and turn left at the corner of "Houheikyo dam iriguchi."
You can pass a signboard and drive 600m more, then you can find and turn left.
It's about 35 km from the center of Sapporo city.
Bus time table
The ride from JR Sapporo Station Bus Terminal to Jyotetsu bus of "Kappa liner" or "Hoheikyo-Onsen", get off at the end Hoheikyo-Onsen in about 80 minutes.
Free shuttle bus service timetable