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