From the BLM website:
"Your trip through Ruby/Horsethief Canyons begins at Loma, Colorado and ends at Westwater, Utah. This stretch of the river runs along the northern boundary of the 74,497 acre Black Ridge Canyons Wilderness. Your trip will include beautiful red rock canyons, 1.5 billion year-old uplifted metamorphic rock known as the "Black Rocks", and an abundance of wildlife to include Bald Eagles, Peregrine Falcons and if you're lucky you might catch sight of the reintroduced Desert Bighorn Sheep. Day hikes into one of the many side canyons provides opportunity for solitude and exploration. NOTE:The railroad runs parallel to the river for much of the trip. Trains often sound their horns, day and night."
