R12 completed!
Actually last weekend, with a 200k perm. Ridgefield-Etna-Silverstar starts/ends in Portland but most of the miles are across the river in Washington state. The ride crosses the I-5 bridge, goes through Vancouver, makes a big clockwise loop, then returns over the 205 bridge. There's an out-and-back bit to accumulate miles, but the focus of this ride is the gravel ascent/descent. Twelve miles of gravel from mile 79 to 91, climbing up from 1130 ft to 2380 ft over the first 5 miles, then descending to 800 ft at the end of the gravel. "Gravel" is a generous term; it was pretty chunky stuff. My 32mm tires survived, but I was dodging the bigger and sharper stuff.
The route
https://ridewithgps.com/routes/34579368