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Gold discovered in Ralston Creek near the present location of 56th Avenue and Benton in Arvada by Lewis Ralston and his party of prospectors who continued on to California, their planned destination.
Lucian Ralston, future prominent county citizen, first travels through the area as an Army scout.
Kansas Territory establishes Arapahoe County to include area of eastern Colorado to the Continental Divide.
William Green Russell party discovers gold near the confluence of Cherry Creek and the South Platte River, touching off the Colorado "Pikes Peak" gold rush.
The Arapahoe City Town Company organized. Although Arapahoe City existed for only a few years, it may have been the first town site in what later became Jefferson County. It was located about two miles east of Golden along Clear Creek.
The first irrigation ditch in the current Jefferson County is dug by David K. Wall, the "father of irrigated farming in Colorado." The ditch extended from Clear Creek and was used to irrigate Wall's vegetable farm. By the end of 1859 two other irrigation ditches had been dug in Jefferson County, the Wanamaker ditch off of Clear Creek and the McBroom ditch off of Bear Creek.
Gold rushers rename rivers Clear Creek and Montana Creek. Montana Creek, named after Colorado’s first gold rush city at its mouth, soon renamed Bear Creek
Coal discovered on Coal Creek, 14 miles north of Golden.
Arapahoe City miner George A. Jackson discovers gold at present site of Idaho Springs, giving sustaining credibility to the gold rush.
Arapahoe City miner John H. Gregory discovers gold at present area of Black Hawk/Central City.
Jefferson County’s first major wildfire, the Miner’s Fire in Golden Gate Canyon, claims three lives.
Golden City established. "City" was dropped from the town's title Jan. 22, 1872.
Golden Gate City established at entrance to Golden Gate Canyon.
Golden City Methodist Episcopal Church, now First United Methodist Church, becomes first religious congregation established in Jefferson County.
Delegates from settlements attend a constitutional convention in Denver to draft proposed state and territorial constitutions.
Voters choose to seek establishment of a new territory rather than a new state.
Constitutional convention adopts a provisional territorial constitution for Jefferson Territory.
Town of Mt. Vernon established at entrance to Mt. Vernon Canyon.
Provisional Jefferson Territory territorial legislature meets and organizes 12 counties, including Jefferson County.
First newspaper, The Western Mountaineer, published in Jefferson County by the Boston Company, George West editor.
First legal trial in Jefferson County, Rollins v Martiney, takes place at Golden City.
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