What are the Sinks and the Rise? Sinks Canyon is so named because the Middle Fork of the Popo Agie, a rushing mountain river, flows out of the Wind River Mountains and through the Canyon. Halfway down the canyon the river abruptly turns into a large limestone cavern, and the crashing water "sinks" into fissures and cracks at the back of the cave. The river is underground for 1/4 mile until it emerges down canyon in a large calm pool called "The Rise" and then continues its course into the valley below. Where the water goes while it is underground is unknown. The sinks narrow to small, unexplorable log and rock jammed fissures. Hundreds of visitors explore this mysterious canyon each year and enjoy hiking, mountain biking, rock climbing, bird watching, and fishing in the surrounding landscapes.

• See the spectacular geology of the mysterious Sinks and Rise.
• Look for birds such as the Lazuli Bunting, the Dipper, the Rufous Hummingbird and Black-headed Grosbeak in the heavy foliage along the river.