Tours are still offered through the San Francisco Bay Wildlife Society. http://sfbws.com/activities/2013/07/06/drawbridge-van-excursion http://sfbws.com/activi

Tours are still offered through the San Francisco Bay Wildlife Society. http://sfbws.com/activities/2013/07/06/drawbridge-van-excursion http://sfbws.com/activities/2013/07/06/drawbridge-van-excurs...