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