This preserve includes much of the south-facing slope rising above what is now known
as Lucas Valley (historically called Gallinas Valley). The highlight of this
preserve is the new Big Rock Trail, a multiple use trail that begins at the
crest of Lucas Valley Road (at the ”Big Rock”), and eases its way up to the Big
Rock Ridge Fire Road. This trail, opened in 2003, is part of the Bay Area Ridge
Trail. It connects with the Loma Alta Trail that ascends the southern half of the valley. Portions of both the
Big Rock Trail and the fire road along the ridge are trail easements that cross
private property, so pay heed to all trail signs posted along the way. The
summit of Big Rock Ridge at 1825 feet is the second highest point in Marin
County (after Mount Tamalpais), and views from the top are spectacular. An
alternate route between the valley floor and the ridge is the incredibly steep
Luiz Fire Road, but one trip up (or down) this old road will make you truly
appreciate the new trail for its beauty and gentle grade.
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Featured Species at this preserve:
White-throated Swift
Cedar Waxwing
Douglas' Iris
Common Kingsnake
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