The Mud Springs Station is well documented and it has been well researched by several authors. Nevertheless, its exact location is in dispute. This site is possibly located about twelve miles southeast of Bridgeport, Nebraska, in Morrill County.  Sources generally agree on its identity as a home station for the C.O.C. & P.P. Express Co.  James McArdle served as stationkeeper for the Pony Express and stage lines, which probably shared the same sod structures. Mud Springs also later served as a telegraph relay station. In February 1865, Fort Laramie soldiers clashed with Indians returning from the Julesburg siege in the Battle of Mud Springs.  

In 1896, Mr. and Mrs. J. N. Scherer purchased the property surrounding the Mud Springs site. In 1939, Mrs. Scherer donated the station site to the Nebraska State Historical Society. Thereafter, on June 11, 1939, Dr. A. E. Sheldon, Superintendent of the Nebraska State Historical Society, dedicated a native-stone monument with a bronze Pony Express symbol and plaque on the site. As late as 1951, the monument and plaque still stood at this location. The text reads:

MUD SPRINGS STATION
A Station on the Pony Express Route--1860-61.
A station on the First Transcontinental Telegraph Line.
A station on the Overland Stage Route.
Battle between Sioux Indians and U. S. Troops, Febr. 6th-7th, 1865
This site given to the State of Nebraska
by
Mrs. Etta A. Scherer and children
To be preserved as a memorial to all the early settlers who/won the West.
Monument erected June 11, 1939,
by/The Mud Springs Womans Club. 

http://www.nps.gov/parkhistory/online_books/poex/hrs/hrs5c.htm#48