D r. F ra n c is c o. Green Valley Rd. S o p h ia. The Posted Order with map of the closure area can be found here. Trail Map. Folsom Lake Crossing. Main Body. State Recreation Area. Folsom Lake. Success at our Poker Ride! Thank you to everyone who attended. East Natoma St. folsom lake trails map. . P a rk w a y. 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.