Thanks I will look up the Matheson preserve. I am really looking forward to this trip. I haven't get many western birds on my list yet. I will be visiting the Grand Canyon, Zion National Park, Arches NP and Leadville Colorado and should have time for birding at all these spots.
I am using the park's birding lists and doing a little studying before I leave. Looking forward to the spotted towhees, wrens, finches and warblers.