Ouray National Wildlife Refuge is located near Vernal, UT. The trail is primarily used for birding and is accessible from March until October.
This one is great. Lots of water fowl. I love to go here during the Mute Deer rut to see big bucks. A number of Elk inhabit the preserve. Also, porcupines are abundant and fun to see. Be sure to take the Shepherd's Bottom Loop and climb the tower that offers a terrific view of the Green River bottoms. All is driveable, though I have hiked the five mile Shepherd's Bottom loop twice.