Moving cattle into a willow branding corral on Ninety-Six Ranch, Paradise Valley, Nevada, October 1979, by Carl Fleischhauer, via American Folklife Center, Library of Congress (all photos here).
Willow corrals are still used on Ninety-Six Ranch. In 2014, Kris Stewart, one of the current owners, told Carl Fleishhauer:
We are concerned with staying with original willow corrals – that is definitely part of Great Basin ranching. They are safer in every way; they have some give to them. And they are the cheapest fencing from a materials standpoint since almost everything is naturally already on the ranch.