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