BOON SLOUGH. Boon Slough rises in a small impoundment known as Willingham Lake eight miles northwest of Uvalde in central Uvalde County (at 29°19' N, 99°50' W) and runs south for seven miles to its mouth on Cooks Slough, two miles northwest of the intersection in Uvalde of U.S. Highway 83 and U.S. Highway 90 West (at 29°14' N, 99°49' W). It rises in flat terrain with local shallow depressions surfaced by shallow, stony gravel that supports water-tolerant hardwoods, conifers, and grasses and crosses into flat to rolling prairie with local scarps surfaced by deep clay that supports oak, juniper, grasses, and mesquite.
The following, adapted from the Chicago Manual of Style, 15th edition, is the preferred citation for this article."BOON SLOUGH," Handbook of Texas Online (http://www.tshaonline.org/handbook/online/articles/rhb26), accessed October 21, 2014. Uploaded on June 12, 2010. Published by the Texas State Historical Association.