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(last updated 9/6/2022)
1992 was the first time I went through Norton. At the time I was not yet what I would describe as a "roadgeek", but I still thought this sign was worth stopping for a photo: 
1992
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Prior to I-25, there was a different main highway that connected Denver to several of the Northern Front Range cities in Colorado. The number of this highway has changed a few times during the past century, but its general corridor has remained the same: it still runs through Ft. Collins, Loveland, Berthoud, Longmont, Lafayette, Broomfield, Westminster, and Denver. Not all of those cities had even been established at the time of the 1916 map shown below, but the highway corridor running along the Northern Front Range is readily apparent (going forward I will refer to this road as the NFRH, for "North Front Range Highway"):
The other day I was driving north on C-470, and I wanted to go east on the 6th Avenue Freeway towards downtown Denver. That movement is shown on the map below:
I rarely drive that direction along C-470, but I have lived in Denver for a long time, and I'm pretty confident about knowing my way around. So as I approached, I was quite certain that I would need to follow eastbound I-70, and that the exit for eastbound US 6 would come up shortly after that.
But then I saw this: the first sign that references US 6 on northbound C-470:
I am about to ask a simple question. It is not a trick question, so no reason to over-think it. The map below (like most maps) is oriented with north at the top. You might not be able to make out much detail, but that's ok, because all I want you to do is take a look at the highway shown in blue. And the question is simply this: does this highway run north-south? Or does it run east-west?
One of the many interesting things about this segment of US 34 is that it essentially follows the valley of the Colorado River between its headwaters in Rocky Mountain National Park and its confluence with the Fraser River in Granby. Consequently US 34 also provides access to all of the major water collection components of the Colorado-Big Thompson Project. Those include Grand Lake (Colorado's largest and deepest natural lake) and three artificial impoundments (Shadow Mountain Lake, Lake Granby, and Willow Creek Reservoir). Since there are many examples of highways which were originally built parallel to rivers, but which later had to be realigned because of water storage projects that were built in those valleys, I set out to explore whether US 34 had any historic alignments that existed prior to the reservoirs in the Middle Park area.
Sanderson, Mar. 2018
(Most recently updated 3/5/2022.) Today, Denver is served by seven different US routes (shown above), but when the US highway system was first commissioned in late 1926, only three routes went through Denver. AASHO officials acknowledged the city's importance by placing it at the junction of a major north-south route (US 85, which ran from a Canadian port of entry almost to Mexico) and a transcontinental east-west route (US 40, which connected Atlantic City NJ to the San Francisco Bay Area):
c. 1927, Rand McNally
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