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To reach the southern trailhead from US 101, exit on Sir Francis Drake Boulevard. Head west on Sir Francis Drake Boulevard toward San Anselmo for about 18 miles. At the intersection of Sir Francis Drake Boulevard and Platform Bridge Road turn left. The trailhead is at the end of the short metal bridge on your right. On the left is a small parking lot with a one-hour limit. There are various places to pull off and park along Sir Francis Drake Boulevard without time limits.
To reach the northern trailhead from US 101, exit on Sir Francis Drake Boulevard. Drive past the intersection of Sir Francis Drake Boulevard and Platform Bridge Road, crossing over a concrete bridge. Shortly after crossing the bridge you see an unmarked road on your right. Turn right on this road then turn left and park on an abandoned concrete street. Walk toward an old bridge. The trail entrance is marked with a large sign that says CROSS MARIN TRAIL.
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