West portal of the St. Paul Pass Tunnel on the Route of the Hiawatha Trail. 1.66 miles long. Unlit except for the lights of riders coming towards you. Water dripping from the ceiling. Heading east you cross the border from ID into MT so you lose an hour. Then rode the NorPac Trail up to Lookout Pass and back into ID, so I got my hour back.
Forgot to mention that I started out the day riding the former Milwaukee Road right of way that is not part of the official trail from Avery, ID. The first tunnel I hit was No. 36. The first tunnel on the official trail is No. 29. As you can see, the St. Paul Pass Tunnel is No. 20. No. 23 is closed due to the collapse of the ceiling. (The Forest Service constructed a detour around it.) Still, that's a lot of tunnels. There are also 7 trestles along the trail. The highest is 230'. Neat ride if you are ever out that way. I went W to E, which means I was going up hill until somewhere in the St. Paul tunnel.