The Colorado Highways Site: About

About | Colored Table Format | Info Given About the Routes | Abbreviations & Terms | Sources

About This Site

This site's purpose is to explore the past, present and future of Colorado's state highway system. The general idea is to log information for all of the numbered highways in the state, information such as where they end, where they go, how they get there, their history, etcetera. This site started out in rudimentary form in spring 1997, after having seen similar sites for several other states. When I decided to undertake this effort, I never imagined I would have spent as much time on it as I have, but I have stuck with it. The site is a constantly evolving, growing thing. I've basically just been continually building to it since 1997. The main bulk of the site is made up of pages that list numerically each numbered highway -- state, US and Interstate -- that has ever existed in Colorado.

Comments? Questions? Concerns? My e-mail address is at the bottom of every page.

As Always, There Are Disclaimers:

THIS IS AN UNOFFICIAL SITE. It is not affiliated with or endorsed by the Colorado Department of Transportation, the E-470 Public Highway Authority, or any other official agency. The opinions expressed here are mine or a fellow citizen's, not of the government of Colorado. This site is meant for general information purposes only. 100% information accuracy cannot be and is not guaranteed.

COPYRIGHT INFORMATION: This site Matthew E. Salek, 1997-present. All text and images are created by myself unless otherwise noted. Use of text and images where I am originator is authorized as follows: Use prohibited for any commercial/profit purpose. Use for non-commercial purposes is allowed under "fair use" (meaning credit is given). A special note on photographs: Many of the photographs shown on this site are not mine, they are given to me. Any use of a photograph taken by someone else is prohibited unless authorized by that person. Thank you for not stealing!

Colored Table Format

When browsing my route listings, you will notice that different routes are in different colors. This is done to quickly convey whether a route still exists or not, and if it doesn't, when it became defunct. Theses colors do not apply to the Auxiliary Routes section of my site, nor the US/Interstate Highways page.

White: Currently Active Routes

These are signed routes that currently exist in the Colorado highway system. Some of them may not be marked in the field very well, but they do exist.


Gray: Pre Mid-1950s Decommissioning

This color is used for routes that became defunct before the mid-1950s.


Yellow: 1940s Route

This is a special case. This color indicates a route that, as near as I can tell, existed only around the 1940s. These are routes which were brought into the system in 1939, and disappear in 1953. There are a lot of them. A write-up on these routes can be found on my history page.

Green: Mid-1950s to 1968 Decommissioning

This color is used for routes that became defunct from the mid-1950s to 1968.

Blue: Post-1968 Decommissioning

Routes which have this color in the table are routes that became defunct after 1968.

Orange: Unknown, Never Signed, Carrier Route, Other

This color is used to indicate several cases:

  • A US Highway that was proposed, but never ended up getting signed.
  • A state route which I have never found evidence of existing. Colorado appears to not have skipped numbers up through at least 403, but below that there are several routes I have never found on a map.
  • A route that served mainly or only as a carrier route. That is my term for a state highway that appears to have been used mainly or only as the state number along a roadway that was a US or Interstate highway.
  • A route whose current status is unknown.
  • Other. Read the explanation.




Information Given in the Route Tables

This section explains the info that is given about each route in the route tables.

Abbreviations and Terms Used

All of the various compass directions are abbreviated with one or two letters. States and provinces are abbreviated with the two-letter postal code. Other abbreviations and terms:


Sources from Colorado State University Morgan Library (which I used when the site first got going in the late '90s):

Sources from the Denver Public Library (used in the early 2000s for additional historical info):

Map collection of George Sammeth of Westminster (helped me fill in gaps in research during 2002):

Sources from other places:


Last updated 8 June 2014