If you want a physical copy of the maps BCP linked to, contact the USGS (United States Geological Survey) Denver office. They can set you up to buy photostatic copies of these and other old 15' and 30' topos. Not sure of the current cost, it was $12/map a 5 years back or so but regular topos (current 7.5' maps) doubled in price a few years ago so I'm not sure what happened to the price for these.
Not all of Colorado was covered at these scales, but there is much of interest to be had for all the major 3' ga roads. (not to mention D&RG std ga and CM, etc, etc.)
hank
ps, I have to got to go to a wedding (NOT mine, thank God!) this AM but I will try to find time to dig out more info & post it, if anyone is interested, sometime this weekend. DHT
Edited 1 time(s). Last edit at 02/14/2014 10:21AM by hank.