I don't want to belabor a point but those spikes shown on the RWGPS profile are indeed within the tunnel. Bore down on the road and you can see where the road enters/exits the tunnel. The satellite view makes things even more clear.
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If you run your cursor along the red line on the map it will coordinate your location with the profile at the bottom and give you grade information. According to the map, there are some really nasty grades on those spikes before mile 20. The ruling grade appears to be 28.5%, and there are other sjort stretches where grade is 20% or higher. But it's all very short.
It is quite useful and often includes a Website link to the campgrounds. One caution. Double check their map locations. I found several mistakes.
I gave up cycling shoes when they got wet and stayed wet. Switched to bicycling sandals with clipless cleats. Only footwear.