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