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