Folsom Lake. If you took any photos please post them in the comments. East Natoma St. F ra n c is c o. Folsom Lake Crossing. Green Valley Rd. P a rk w a y. Trail Map. D r. There is no trail access or alternate route within Folsom Lake State Recreation Area. Main Body. S o p h ia. State Recreation Area. Success at our Poker Ride! Thank you to everyone who attended. . The Posted Order with map of the closure area can be found here. folsom lake trails map.