The 2005 US Champs were held on the Dutchman Flat map in Deschutes NF. Unique challenge was the 1:5000 inset map of fine detail on 1:10000 Green (and other) maps. I lost huge time on our long 6-7 leg and then was near 'best of Green' on 4 legs in detailed area at end of course.
Map by CROC and updated by Mark Dominie in 2004.
There is a Dutchman Flat trailhead across road from Mt Bachelor ski resort.
Went biking from here two days ago - looks like a fun place to orienteer too :)