Here are some small towers that are named in the Western Sloper Guidebook that might be added to LOJ. They are very small though, so you may or may not want to add them.
The Incisor (~25 feet prominence):
39.562493, -107.305869
Molar (only 12 or so feet of prominence):
39.5625302, -107.305828
The easiest route on The Incisor is 5.6 and the easiest route on the Molar is 5.3.