Notes at the Library of Congress credit the mill as the only example of Spanish Colonial gristmills “powered by a rodenzo, a horizontal water wheel, that is currently operational in the United States…and is a rare survivor of a once prevalent feature of eighteenth- and nineteenth-century rural northern New Mexico.” Martin Stupich, Barela de Truchas Molino, Courtesy of Library of Congress, Prints and Photograph Division. Creator: Historic Ameri- can Engineering Record. Negative number: HAER NM 14A-1.