The Texas Parks and Wildlife Department has designated Lake Buchanan, located west of Burnet and north of Inks Lake in the Colorado River Basin, as “infested” with invasive zebra mussels.

The Thematic Mapper on Landsat 5 captured these images of Lake Buchanan, Texas, in October 2011 and October 2003. Note the distinct, tan “bathtub ring” around the reservoir in 2011, ...