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