http://www.ksgenweb.org/archives/1878/images/osborne.jpg has an 1878 map with the Twin Creek location indicated.

I would also try contacting the North Central Kansas Genealogical Society, PO Box 251, Cawker City, KS 67430 They have information from several counties in the area including Mitchell, Jewell, Osborne and Smith.

Osborne also has the Osborne County Historical Museum. Address is just Osborne, KS Phone (785) 346-2626 or 346-2418. I would try them for photos.