Concerned about potential falling trees and a weakened earth dam, the National Park Service has closed two areas of the GGNRA north of the Golden Gate Bridge and one at the southern edge of the GGNRA, including one in the Marin Headlands adjacent to Sausalito:
Tennessee Valley Beach and the area below Tennessee Valley Dam: (The white area in Tennessee Cove in the first map below.) The dam is already filled to a high percentage of its capacity, and the Park Service is concerned about people being downstream, since they could be trapped between high volumes of water being released through the spillway and incoming high tides — not a good combination. They expect the beach to be closed off and on all season, although they will open it if water releases from the dam decline due to lack of rain. The Tennessee Valley Trail is not affected by this closure, you just can’t go all the way down to the beach..
Fort Funston Beach Access Trail: (2nd map below.) The cliffs at Fort Funston are formed from rock that naturally erodes and crumbles, and the traffic from people and dogs places visitors in dangerous spots. First of all, walkers are advised to stay back from the cliff edges at least 30 feet. This seems like a lot, but some of the cliffs have been undermined and if something big gives way a landslide can result, not just a rock fall. The north trail down to Fort Funston Beach has been caused due to winter damage, and is unlikely to reopen until springtime. The only way to get to the beach at Fort Funston will be the sand ladder that is located south of the hang glider launch zone.
Hawk and Haypress Campgrounds: (3rd map below.) These campgrounds, popular with bike riders and hikers, will be closed from January 15 until March 31. The trail system that reaches the area can be treacherous, and their location in century-old eucalyptus groves (which tend to shed limbs in high winds) makes them dangerous.