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Ascent of Twin Sisters on 2018-01-21

Climber: Brett Moffatt

Other People:Solo Ascent
Only Party on Mountain
Date:Sunday, January 21, 2018
Ascent Type:Successful Summit Attained
Peak:Twin Sisters
    Location:USA-California
    Elevation:2259 ft / 688 m

Ascent Trip Report

Coming from Suisun Valley to the east, Twin Sisters Road is open to about the 1000' elevation, after which it becomes a gated private road passing a gun club and private homes, up to the "Glass House" mansion on Twin Sisters' lower south peak. The October 2017 Atlas Fire destroyed the mansion, along with many other homes in the region. There's a short aerial video showing the devastated mansion and south peak area on SFGate - https://www.sfgate.com/bayarea/article/Glass-House-Fairfield-CA-fire-1700-Twin-Sisters-12281745.php . The fire burned off the dense vegetation on top of north Twin Sister, while mostly skipping over Green Valley and portions of Peak 2137 to the west.

Coming from Napa Valley, Wild Horse Valley Road is a public road up to and along the west shore of Lake Madigan. However, Lake Madigan and nearby Lake Frey are City of Vallejo reservoirs, off limits to the public with plenty of 'no trespassing / loitering' signs to repel eager sightseers and fishermen. It seems that the lake's access road is patrolled, or at least regularly visited by city workers. The land around the city property is occupied by a few private homes, a vineyard and stable. There is a pullout with no negative signage just before you reach Lake Madigan, but leaving a vehicle here for a period of time might alert the watchers to a stranger's presence.

Someday Twin Sisters may become accessible from the Bay Area Ridge Trail, which is planned to pass through the City of Vallejo watershed lands, on the way north to Atlas Peak. The city has previously sought to sell this property (and the equally spectacular Lake Curry below Mt Vaca) to a land trust or other appropriate buyer, which will eventually allow for some public access. I don't know where these efforts currently stand, but the city seems to recognize that this area is better suited for open space, than for the little water it provides the city's customers.
Summary Total Data
    Total Elevation Gain:2009 ft / 611 m
    Total Elevation Loss:2009 ft / 611 m
    Route Conditions:
Road Hike, Open Country, Bushwhack, Stream Ford
    Weather:Cool, Clear
Ascent Statistics
    Gain on way in:1439 ft / 438 m
        Gain Breakdown:Net: 869 ft / 265 m; Extra: 570 ft / 173m
    Loss on way in:570 ft / 173 m
    Distance:6.3 mi / 10.1 km
    Start Trailhead:1390 ft / 423 m
Descent Statistics
    Loss on way out:1439 ft / 438 m
        Loss Breakdown:Net: 869 ft / 265 m; Extra: 570 ft / 173m
    Gain on way out:570 ft / 173 m
    End Trailhead:1390 ft / 423 m



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