We have already mapped out the area
To see the route: Baltimore Bike Trails & Routes
And double click on Ellicott City several times to get the zoom level desired.
And as always if you have a route or trail you want to share with the community you can send us a GPX file or a link to a site that allows exporting of a GPX file such as bikely.com (There are a lot of good map drawing features on this site as you can move points as well as add or delete points on a route.)
Image from: http://www.trainweb.org/oldmainline/ect1.htm