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