Keep right, skip forks left, and cross the outlet of the reservoir at 4.1. Skip more forks to the left, and pass a jeep trail right at 5.2. A cattle guard is reached at 7.0, and an intersection at 7.9. Go left, skipping a jeep trail right at 8.2. Cross another cattle guard at 8.9, and park at the saddle at 9.7.
Passenger cars can probably get here when it's dry.
Hike up the ridge to the east, keeping to the left side where it levels out on top. I'm not sure where the HP is.