http://en.wikipedia.org/wiki/Sinks_Canyon_State_Park Pretty close to your planned route and I find it interesting.
I'd also suggest you drop that southeastern CO leg and make it about 20 miles south going across New Mexico. Go to Boise City- Kenton OK- ride NM 456 to NM 551 then turn north to Branson CO and over to Trinidad. NM456 is Dry Cimmaron Canyon scenic road and does have about 22 miles of gravel which I rode on the ST1300 just last month. It's a much much more scenic back road then the boring 160 across Colorado. The gravel is pretty tame as long as it's dry.
Raymond
I'd also suggest you drop that southeastern CO leg and make it about 20 miles south going across New Mexico. Go to Boise City- Kenton OK- ride NM 456 to NM 551 then turn north to Branson CO and over to Trinidad. NM456 is Dry Cimmaron Canyon scenic road and does have about 22 miles of gravel which I rode on the ST1300 just last month. It's a much much more scenic back road then the boring 160 across Colorado. The gravel is pretty tame as long as it's dry.
Raymond