UN 13,015 (formerly UN 13,020 interpolated) near Maroon Lake and Willow Pass has been determined to be no longer a ranked summit per Lidar evaluation, which gives it 292 ft. of prominence. This has reduced the total number of ranked 13ers from 584 to 583.
LIDAR technology has demoted this summit from "ranked" status, (prominence of 276 ft.) however, UN13,509 combines easily with Trico Peak, T.10 and Telluride Peak (which is now ranked) from Black Bear Pass. UN13,509 by itself is an easy Class 2. Though UN13,509 can be reached by the ridge connecting Trico and UN13,509, a section of that ridge north of the Trico summit goes at a solid 3rd class with some exposure. To keep this climb at Class 2 level, a little extra driving in a 4WD vehicle helps.