One of my favorite streams in the state is the Rio Costilla. It is a tailwater fishery almost on the border with Colorado located in the Sangre de Cristo Mountains. I enjoy fishing it during the summer when the heat is on on Albuquerque; during the evenings on the river we had to put on light jackets and sweat pants. The river was flowing well - at 40 CFS and mostly clear. We all caught fish on nymphs with the going patterns being... It is a Rio Grande Cutthroat stream with most of the fish being "Cutbows". I will be going up to the river at least a couple of more times before autumn sets in; it fishes well during September and up to the time the water releases from the dam cease. I highly reccomend a trip here to fish and to view the impressive Valle Vidal.