Summary - Lemi Rock, in the Indian Heaven Wilderness, combines good trails, a steep bushwhack (not for beginners), and some optional ridge scrambling. While makes for a longish day, link it with Bird Mountain for a two summit, twelve point outing. The trip from Portland to the Cultus Creek Campground (day fee or pass required) is about two hours on mosly paved roads. ATT digital service is good, as is APRS. The trail from the campground to the summit trail is in good shape and very popular. The summit trail involves some bushwhacking and is steep. While the summit trail ends on the north side of the summit ridge (which is in the activation zone), you can make your way to the summit on the south end, which involves a bit of route finding and a class three scramble.
TL;DR - Lemei Rock is a shield volcano and the highest point in the Indian Heaven Wilderness. I combined it with Bird Mountain by hiking in from Cultus Creek Campgound on Indian Heaven trail #33 and Lemei Rock trail #34. Both trails are well-maintained and quite popular. At roughly (46.02312, -121.76401), you will find a faint user trail heading southeast and up the ridge. The trail comes and goes; stay on the nose of the ridge, which is steep, and work your way through the snags and bands of brush. Like all the bushwhacks around here, taking/following a compass bearing is a handy skill.
The user trail more or less ends on the north end of the rock rim and, barely, in the activation zone. There is a way along the ridge to the summit proper on the south end which involves route finding, class three scrambling and climbing, and some narrow, exposed trail. Skip this adventure if you haven't done this before or if ithe weather has been wet.
From either location, you will have views of all your favorite volcanoes and the other Indian Heaven SOTA peaks. Take a mast if you want to do HF and place your wire as if you will be sharing the summit with other hikers because you probably will. ATT digital service was very good and was APRS; I was able to spot using both. I did not try VHF but my experience on other mountains in this area suggests it is usable with a good antenna. When you finish work your way back down the way you came up.
From Portland, I took I84 to the Bridge of the Gods to Carson to Wind River Highway. The drive to the campground took a little more than two hours. Note that the trailhead for Indian Heaven #33 starts at the day parking area, not the campground, and requires a NW Discover Pass, its equivalent, or five dollars in the self-pay box. This is also a wilderness area and requires a self-issued permit. This is a popular trail and area. You will encounter other hikers, on the weekend at least, and probably - as I did - have company on the summit.
Combine Lemei Rock with Bird Mountain, also along this trail, for a longish day with two challenging bushwhacks, two nice views, and twelve SOTA points. Both require off trail skills, being comfortable with negotiating steep, brush, snags, and often complex terrain.