There are actually some excellent directions and a map if you click on the "local sites and Maps" tab at the top of the page here and then click on "UWA Places" link. This brings up google maps with a lot of good riding spots marked. Zoom in on the southern part of utah lake and find and then click on the Lincoln Beach site marker. At the bottom of the description of the site is a good description of how to get there from I-15. (and you can look at the map while you read it