First appearing on early Spanish maps as the Rio Escondido, or hidden river, and later named Rio de las Nueces after the abundant pecan trees along its banks, the Nueces today is a stream of seeming contradictions: a river that runs above and below ground; a geographic reminder of a history both noble and egregious; and a spring-fed stream transformed into a salty, steep-sided channel.
From its fresh, clear headwaters on the Edwards Plateau, Margie Crisp and William B. Montgomery follow the river through the mesquite and prickly pear of the South Texas Plains, to the river's end in...