St. Louis County Library will expand Sunday hours to three additional branches in 2014. Starting January 5, the Cliff Cave, Natural Bridge and Thornhill Branches will be open from 1-5 p.m. on Sundays. These locations join Headquarters, Daniel Boone, Florissant Valley and Tesson Ferry in offering Sunday hours. The addition of more hours is made possible by the successful passage of Prop L in November 2012, which increased the library’s tax ceiling.Â