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