Kansas State Route 177 is a north-south highway in Northeeastern Butler County. This runs along the eastside of El Dorado Lake. KS St Rt 177 does not pass through any towns in Butler County. KS St Rt 177 is not multi-plexed in Butler County. KS St Rt 177 intersects the following highways in Butler County. U.S. Rt. 54, near El Dorado. Interstate 35, near Cassoday. Kansas Turnpike, near Cassoday.