TROCHET, J.A. 1989 33 Journal Survey of Rio Grande riparian corridor from 6.1 mi NW of Presidio, Presidio Co., Texas to Arligus, Brewster Co, Texas, and Rio Grande Village, Big Bend National Park, Brewster Co, Texas. August 18 I discovered that all these trees were across the river in Chihauhua, (Mex) Mexico. Only 2 sp. of Tamarix grew on the US bank, admixed rarely with what I think is a true willow (Salix). This pattern, of course, sometimes changed but usually spaced, large cottonwoods, all on the Mexican side, Red for three exceptions. At Alomito Creek, about 6.4 miles ESE from Presidio, there were 5-6 large cottonwoods and some large willows associated with the perennial (fist present) creek. These were trees about 45 ft tall, 3+ ft dbh, the willows sl. smaller, on both banks of the creek. There was a picnic area with a green lawn being watered on the SE side. No goldfinches here. The most promising stop, and the only goldfinches detected on two routes. One was certainly in Mexico, in or over near a large cottonwood set 60-70 yards back from the river bank. The other was in Tamarisk upstream about 50 yards. I think it was on the US side. The attraction of the place was a trio of large cottonwoods, 18, 36 & 48" dbh. The smallest tree was only 25' high, its bole growing at a 45° angle. The other 2 were about 55' tall. These were near the confluence of a 40 foot wide dry wash and the Rio Grande (4 miles ESE of Pre- sidio. There were other large cottonwoods about, too, a few in Mexico and two groups of 4 set 100 yards back from the river, 1/2 mile downstream. Everywhere else along the bank there was dense salt cedar, here generously admixed with cane and rarely with willow, except for a line of willows 20'