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