From Summit Post: Denman Peak is located in the Tatoosh range along the southern boundary of Mt. Rainier National Park in Washington State. Another prominent, if lesser, peak in the Tatoosh Traverse, Denman, lies just northwest of Plummer Peak, and just east of Lane Peak. Denman is an easy scramble and has great views of the surrounding peaks and Mt. Rainier across the valley to the north. This peak is a slight notch harder than Plummer (e.g. off-trail) and likely receives fewer visitors. The easiest approach is via the Pinnacle Peak trail and following a user path across the north shoulder of Plummer.
Denman Peak could easily be combined with climbing Pinnacle Peak, Plummer, or other peaks along the Traverse for a full day outing.