Sevier Lake does not exist. Rumor was, there used to be a broad mudhole in the desert where the Sevier River sank into the earth. In spring, the area around the mudhole would flood wide enough to be called a lake. Somebody put it on the map. And since then, map makers have been copying, just like you did on your 10th grade English research paper.

Picture: Not Sevier Lake. Actually, it's a fun mountain bike trail near St. George, called the Green Valley Trail.
Bruce Argyle, Canon Rebel G, 80 mm w polarizer