Bill Williams River National Wildlife Refuge is a protected area located in the state of Arizona. The refuge serves as an important habitat for a variety of wildlife, including river otters, beavers, and endangered fish species. There are several reasons to visit the refuge, including hiking, fishing, bird watching, and wildlife viewing. Some specific points of interest to see include the Bill Williams River and the Parker Dam. Interesting facts about the area include the presence of the endangered razorback sucker and the historical significance of the Parker Dam. The best time of year to visit is during the fall and winter months, as temperatures are cooler and wildlife is more active.