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