Trail historians generally agree that Chimney Rock was a Pony Express station,  however, the exact location of this site is still unclear. Two traditional sources place the station between the Chimney Rock formation and the river: one places the station at Facus Springs, nine miles northwest of Bridgeport, while the other source locates it two miles south and one mile west of Bayard, Nebraska.

http://www.nps.gov/parkhistory/online_books/poex/hrs/hrs5c.htm#50