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