1858 fall: Denver was settled.

1864 May 19: The South Platte river and Cherry Creek flooded and wiped out a lot of Denver and killed eight people.

1870 June 22: The Denver Pacific railroad line from Cheyenne to Denver was completed This was the first railroad into Denver and reduced the travel time from twenty hours by stagecoach to ???

Aug 15: The Union Pacific Eastern Division railroad line from Kansas City to Denver was completed (it later became the Kansas Pacific line).

1882: The Burlington railroad line to Denver was completed.