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