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