The time I rode the North Cascades Highway, I had to wait for a Huey to lift a rock out of the road. It was about half the size of the one your picture, Frosty.
On my first really long ride, I was on my GL650i Silverwing riding with a friend on his GL1200 Goldwing. We'd ridden from Fort Morgan to Grand Junction (330 miles), spent the night with my folks and were scouting a possible bicycle-camp route. We'd ridden down to Montrose, across to Gunnison, up to Lake City and stopped for lunch. Then we rode out to potential campground and when we got there, my buddy's clutch wasn't working. We figured out it was dry and he found the only can of brake fluid in Lake City. Then we filled his clutch reservoir and bled it so we could get back on the road. It started snowing just as we were finishing up -- and this was on May 8, my son's birthday, and we were hoping to back in Montrose in time for his birthday party that night!
Snow continued to Creede, then turned to rain. We hit patches of snow and ice going over Wolf Creek Pass, but by the time we got Durango, it was 65F when we ate supper at a fast food place. By the time we were going over Molas Pass and heading down towards Silverton it was dark and snowing and Jim was riding way too fast for me. I touched a floorboard in a curve and thought I was going to die! But we made it past Silverton, and then it snowed again as we were going over Red Mountain Pass. As we were on the last few miles before Ouray, with cliff on our right and canyon drop-offs on our left, Jim was out of sight again and I came around a curve and there was a basketball-sized rock still rocking from where it had fallen. By this time, I was absolutely sure I was going to die.
We got to my son's at 10:30, about a half hour after my folks had headed back to Grand Junction, ate a quick piece of birthday cake and got home to my folks at 12:30. The temperature in GJ was 72F. I still don't know whether to watch for falling rocks and ignore the road or to watch for fallen rocks and pay more attention to the road.