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