Writer and artist Margie Crisp has traveled the length of Texas' Colorado River, which rises in Dawson County, south of Lubbock, and flows 860 miles southeast across the state to its mouth on the Gulf of Mexico at Matagorda Bay. Echoing the truth of Heraclitus's ancient dictum, the river's character changes dramatically from its dusty headwaters on the High Plains to its meandering presence on the coastal prairie. The Colorado is the longest river with both its source and its mouth in Texas, and its water, from beginning to end, provides for the state's agricultural, municipal, and...