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