Costilla Creek (kos-TEE-uh), c.50 mi/80 km long,Taos co., N N.Mex. and NE Costilla co, S Colo.; rises in Sangre de Cristo Mts., N.Mex., 35 mi/56 km NNE of Taos; flows SW through Costilla L., then NW, past Costilla, N.Mex., and into Colo., then W and SW, crossing back into N.Mex. just before joining Rio Grande NW of Ute Peak. Also known as Rio Costilla and Costilla R.
