From highway 280: take the Westborough
exit in South San Francisco. Drive west on Westborough (it becomes
Sharp Park Blvd.) to College Drive.
From Highway 35: turn west on Sharp Park Blvd. in San Bruno.
Follow Sharp Park Blvd. about three-fourths mile to College Drive.
From highway 1: drive east on Sharp Park Blvd to College Drive.
During the first mile, you will overlook the S. F. County Jail,
walk through a former Coast Guard Reservation, and traverse two
35% slopes. Go down slowly and rest frequently going up. Two trails
are visible going up the southfacing side - one is wide,
the other follows a water runoff. Both trails come out at
the same place and both are steep.
Studying the landscape is a great excuse for rest stops! Notice
the southfacing slope has sparser, lowgrowing vegetation
compared to the greener, more dense vegetation on the northfacing
slope. Vegetation on the northfacing slope is also more varied.
The northfacing slope is protected from the sun during long,
warm afternoons and plants can retain more moisture. Vehicles
using this area 30 years ago have worn the vegetation away. During
heavy rains, soil washes down these slopes creating larger areas
devoid of vegetation.
This trail meets the Mori Ridge Trail after about 1 mile. Turn
left to reach the Discovery Site. When you reach the Portolá
Discovery Site you can do some exploring.