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