I have several trail system maps for Colorado. What area are you looking for specifically? Don't know of any site where you can download trailmaps. Trails Illustrated makes lots of good trail maps printed on waterproof plastic. They cover a big portion of Co.. There's also Thundertrail Navigation. They have a few maps out. Their Woodland Park/Divide area map is great. They also make one for Texas Creek and a few other places. For a Trails Illustrated map retailer near you, go to their website at www.trailsillustrated.com . Thundertrail has a site as well.