The CDT Coalition has published maps for the CDT. In PDF format. For FREE!
http://continentaldividetrail.org/maps/
New Mexico maps 100-103 show the information that you need.
The CDT enters the W.A. at mile 651.5 on Map 100 and exits the W.A. at mile 663.5 on Map 101. There are several roads you can pick for ending the trip.
Cheers!
Wayne