Two additional maps from 1877 showing area:
First a map showing general location of Blue Mills Ferry (marked in river in upper left corner)
http://www.historicmapworks.com/Map/US/51709/Township+50+North+Range+31+West%2C+Missouri+River%2C+W.K.C.+and+N.W.+R.R.%2C+Little+Blue+Creek/
Second Clay Co 1877 Atlas that show Blue mills landing Road extending to the Wm Burris Property on the north side of river just west of the previous maps location of the ferry.
http://www.historicmapworks.com/Map/US/482261/Township+50+++51+N+Range+31+W++Liberty++Liberty+Landing/Clay+County+1877/Missouri/
John R