Unfortunately this summit is located on the Phillipi Ranch which is private property. Phillipi Canyon Rd (County Rd) takes you to the well-signed No Trespassing large sign. I talked to the Ranch caretaker who lives at the end of the county road. He said "there's no chance for obtaining permission to enter."
Start the ascent at 45.99028, -121.80308 on the Thomas Lake trail. Initially the trail threads between two lakes then starts up an old logging road (my guess) before Indian Heaven became a wilderness in 1984.
Note that it can be very windy on the easterly exposed summit, especially if there is any kind of east wind in the Gorge.
General: As a Klickitat Cunty highpoint, this is surprisingly activated often by the PeakBaggers. I saw a lot of boot traffic. See https://peakbagger.com/peak.aspx?pid=310 for a lot of trip reports and .gpx tracks.
Directions: From Goldendale WA, take SR97 north 14.5mi to Ski Lodge Rd. West exit. Go past the old Ski Lodge and west past Simcoe Butte/MC-051 which is on Yakima Tribal Lands. Side trip: drive up the narrow road to the summit for spectacular view of the Yakima and Simcoe valleys.
USFS-Yakima Tribal lands bisect this summit. Activate to the west to be on USFS properties. See the attached map. Beautiful views of Mt Adams to the north but an exposed summit, i.e. can be windy.
The summit is in the middle of a Christmas tree farm owned by Fox Farms. There is a graveled road (about ½ mi) to the top. There is several commercial comms at the summit and all protected by cameras. The access road is “generally” wire rope gated. The property is not posted.
28Dec2023: Active logging has begun in this area.
Davis Peak is the site of a regional broadcast NOAA Weather station operating on a freq of 162.525 at 100w to a gain vertical antenna. See https://www.weather.gov/nwr/sites?site=WNG604
Consequently, expect front-end overload with your 2m handheld. I have used my SotaBeams 2m RF bandpass filter with very good results. See https://www.sotabeams.co.uk/bandpass-filter-for-2m/ Cost for a USA purchaser is $48.
Maryhill Benchmark is on the east side of SR97 and in the middle of a giant windm9ll farm. From what I can find, all access is blocked by gates and no tresspassing signs. Undoubtedly for security purposes.
The Larch Mtn access road will be closed for paving "most of 2023". See https://www.multco.us/roads/webform/larch-mountain-road-paving-and-repair for the details.
The Weyerhaeuser gated entrance is about 3 miles east of the Dole Valley Rd turn from the NE Sunset Falls Rd. It appears that Jack Mountain is located on Weyerhaeuser private property and based on the below picture of the signs, access is not allowed without a Weyerhaeuser Recreational Access Permit. Jack Mountain is in the Yacolt Permit area. Their website says the permits are "Sold Out". I also saw a permit price of $300 which is beyond my SOTA budget!