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