It can be difficult to reconcile my trail junctions mentioned below with reality. There were a number of junctions. Some were seen outright, some were missed, and some were snow-covered. This report
may be helpful. It also describes the continuation to the summit of Mt. Adams.
This is a description for a route to the highpoint of Skamania County, which, with one failing swoop on May 18, 1980, transferred itself 25 miles eastward and 740 feet downward to the west slopes of Mt. Adams. Pop goes the Weasel!
The county highpoint has been called "Skamania Pinnacle" even though there really isn't a pinnacle there. The highpoint is what's called a 'liner' because it resides on a county line. That is, just beyond the county line the terrain continues to rise (in this case into Yakima County). And so, by virtue of the lay of the land on this side of Mt. Adams, the highpoint of Skamania County occurs where the county line meets the highest contour on the volcano's West Ridge. This highest contour is 8,920+ ft.
With modern-day GPS units--especially the more powerful/accurate ones--the exact location of the contour-county line touch (tangent) point can be determined with reasonable certainty. But you can never quite know if you're at the exact highpoint. There are no survey marks (and we saw nary a cairn nor register). The best thing to do is to continue climbing up the crest of the West Ridge, passing through 8,920 ft en route, then turn around and come back.
There are a number of approaches to the highpoint. A popular route is from the southwest via the Stagman Ridge Trail. See here
for some other trip reports. For this route page I will only be describing a route from the direct west via the Table Mountain Trail between Twin Falls Creek and No Name Creek. I believe this route is the shortest of them all and can be done in a day no problem. Recommend a bike and a GPS unit. The bike is useful for the first two miles of trail. The GPS is useful for the confusing forested and undulating terrain after you leave the trail but before you burst out to the alpine. It can also be useful in a whiteout.
Pre-map the route
It may be a good idea to input the route on a GPS (using waypoints) in advance and use these to steer yourself. This saved Don and me a lot of time and bewilderment--especially on return.
Table Mountain Trail
Drive FR-23 past the west side of Mt. Adams. The unmarked trailhead is located halfway between mileposts 37 and 38. Elevation is ~3,660 ft.
The trail rises moderately (bike pushing territory) for the first couple of miles and eventually reaches a junction at ~4,800 ft in a boggy area (or dry in summer). Head east (left) at the junction. The trail climbs more steepily after the junction in a few switchbacks with roots. Pushing bikes through here will seem exasperating but it is worth it for that serveral hundred yards because the trail flattens out again afterward for another half-mile to another boggy area at ~5,200 ft. Eventually the trail crosses a meadow and fades or makes other junctions that won't be going in your direction eastward to Mt. Adams.
At about 5,400 ft the trail junctions with the trail to Riley Camp then junctions with the PCT closely southwest of Burnt Rock (6,000+ ft). Burnt Rock won't be too visible here as you will still be in the light forest. You won't be using the PCT.
The Cross-Country Part
Leave the trail where it meets the PCT and keep ascending progressively more open slopes eastward. The trees end for good at about 6,200 ft, at which point there are a myriad of knobs, swales, ridges, and hollows that will force zigs and zags. In early season snow will ease progress across pumice. In late summer the pumice may punish.
Eventually you will be able to see the objective West Ridge high up the mountain. This ridge is distinguished by its deeply undercut north side (freeze-thaw nivation?) hanging over the deep cirque of the Pinnacle Glacier. The county highpoint is located just down the ridge (west of) the undercut part. There is a constant rain of small rocks from this undercut that stirs enough dust into the air to dirty the ridge at about 9,300 ft. In early season the snow will be liberally dusted on the ridge there.
The routes to the highpoint are many. In a whiteout a good option is to adjust your bearing slightly north of due east so as to meet the south fringe of the Pinnacle Glacier (no crevasses at fringe) and take it up the ridge. There is one section where the ridge rises steeply enough to be considered Class 3. You can avoid this by swinging rightward (the left side is more exposed). The final few hundred yards are tedious but inconsequential.
5-7 hours depending on fitness, 3-4 hours down depending on whether you used a bike or not
6-7 miles depending on how direct your route is
Continuing to the Summit?
It is feasible to climb all the way to the top of Mt. Adams from the county highpoint (see here
). You will only be 3,300 vertical feet from the top. The idea would be to keep going up to below The Pinnacle
(12,080+ ft), climbing over its top or circumventing it via easier, though rockbanded, slopes on the right (south) to avoid persistent rockfall on the north. A half-mile of relatively flat slogging will then be required to get to the true summit from The Pinnacle.
A GPS unit
Ice axe in early season
Gaitors to keep the snow/pumice out of your boots
Mountain bike for the first couple of miles of trail. The ride down is quite nice and quick (20-30 minutes).