That squiggly line called a tilde was used to represent the mathematical symbol for approximately which are two tildes one directly above the other. It was an approximation which is what I recalled from thru-hiking the CDT and CO CDT and confirmed by the CDTS(Continental Divide Trail Society).
http://cdtsociety.org/colorado.htm
Even though I thoroughly enjoyed long/longish 68? and 711 mile(I had to just dig up old CDT trail journals) CO CDT hikes and the CDT has many alternates including several in CO where did you get the CO CDT is up to 800 miles? I've never heard the CO CDT segment being that lengthy.