Weightless in San Luis Potosi

OUTSIDE VALLES, MEXICO — When we first arrived at this stream, I knew we were in a special location. The clear, turquoise blue water rivals that of any picture from a Caribbean tour magazine. When I put my snorkeled face in the water, I can actually see mussels in the streambed below, something that doesn’t happen very often in Illinois streams. Collecting the mussels, however, is proving difficult.

Read Jeremy Tiemann’s account of this effort to collect freshwater mussels from the Valles River basin in the Mexican state of San Luis Potosi.