April 3

1860 On April 3, 1860, the Central Overland, California and Pikes Peak Express Company began an overland mail service from St. Joseph, Missouri to San Francisco, California. Known as the Pony Express, the route in Wyoming followed the Oregon Trail. Between 37 and 42 Pony Express Stations have been identified for Wyoming, the eastern-most station being Cold Springs and the western-most being Bear River. The Pony Express service lasted a little more than a year, ending in October, 1861.

1888 On April 3, 1888, Frank S. Wood filed a plat for the townsite of Otto in the Big Horn Basin. The town was named for Otto Franc who used the range in the vicinity to winter some of the Pitchfork Ranch's cattle.