Route 1: Past Forestville.

Take 116 W past Forestville.
Turn Left on Green Valley Road. (smaller sign, looks like a neighborhood street).
Turn Right at Mt. Gilead Sign.

This route does go up a small windy hill and comes back down an equally windy road.This is the most consistently available route in heavy rain.

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Route 2: Harrison Grade Road

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Take 116 W.
Turn Left on Graton Rd.
Continue Left on Graton Rd.
Turn Right on Tanuda Rd.
Turn Right on Du Pont Rd.
Turn Left on Harrison Grade Rd.
Continue Right on Harrison Grade Rd.
Turn Left on Green Valley Rd.
Turn Left at Mt. Gilead Sign.