Just got back from a LONG day. First time ever for me to see the Valle Vidal and all I can say is WOW! What a beautiful area and I understand why it's once in a lifetime. A firend and I fish the Rio Costilla and managed to get 50+ to the net. Nothing huge (maybe 12" or so) but it was a day I'll always remember. Red humpies in about a sz 14, yellow stimulators in a sz 12 both worked on top. Just about ANYTHING subsurface snagged fish. Size 20 flashback pheasant tail all the way up to a size 12 green, ugly, Irish nymph (my friend is here from Ireland working). In the middle of the day I absolutely killed them on a size 18 green sprakle caddis larvae. Good times!