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