It all depends on the final route that TWBC decide to roll out this year. They changed the course last year to blend better with the traffic patterns. I did the 60 mile loop last year. This route takes you out towards Kapowsin with a nice climb up to Kapowsin Lake and another into Eatonville. If I remember correctly, the 60 mile route offered the largest elevation gain due to those two climbs, but I don't remember the exact amount. I've never done the Bonney Lake route, but have done bits a pieces of it during various training rides in the Southend. In my opinion, this is more of a rolling course with the only major climb out of South Prairie. Hope this helps.

Terry Davis
Auburn, WA