“A wide, steep, dirt road connector with erosion berm "jumps" to make it interesting.
— David Gregg
On a Google map, this trail shows as E.Cut Across. But, according to the California State Park map, its name is "I Think I Can", which is more appropriate when climbing.
Depending on if you park at the top of the hill, or down at the bottom, this trail will have riders going in both directions, so be very careful if you're going downhill (There are fun singletracks elsewhere that most riders take downhill, so percentage wise, this is mostly a climbing trail). And does it ever climb. Close to 10% for most of its length. Take your time and find a good rhythm to pedal to. Music helps.