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Author Topic: Arizona Mileposts  (Read 2560 times)

Rover_0

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Arizona Mileposts
« on: March 02, 2014, 08:12:26 PM »

I'm aware of how Arizona numbers its mileposts,* but I feel that this topic deserves a thread of its own. How long has Arizona been doing this?

Also, I'm not sure what route you would need to take to trace back US-89A's (MP 613 at Utah line) mileposts?

*Branching highways' mileposts continue as you go N or E from a junction.
« Last Edit: January 21, 2015, 01:45:57 AM by andy3175 »
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Re: Arizona Mileposts
« Reply #1 on: March 02, 2014, 08:14:29 PM »

I'm not sure how they're different from the other states, so this will require some explanation for the people that don't know.
« Last Edit: January 21, 2015, 01:46:01 AM by andy3175 »
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« Last Edit: January 21, 2015, 01:46:04 AM by andy3175 »
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Re: Arizona Mileposts
« Reply #3 on: March 02, 2014, 08:22:10 PM »

The 613 is pretty straightforward. Follow US 89A to old US 89 (roughly US 89 to I-40 to SR 89 to US 93 to US 60 to SR 79 to SR 77 to old I-19 Business to the I-19 frontage road to I-19 Business to the border)
« Last Edit: January 21, 2015, 01:46:06 AM by andy3175 »
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swbrotha100

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Re: Arizona Mileposts
« Reply #4 on: March 02, 2014, 11:24:16 PM »

I'm not sure how they're different from the other states, so this will require some explanation for the people that don't know.

Some routes don't start at zero with the mileposts. They carry over from junctions with other routes.
« Last Edit: January 21, 2015, 01:46:08 AM by andy3175 »
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Konza

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Re: Arizona Mileposts
« Reply #5 on: July 14, 2019, 01:30:08 PM »

I know this thread is over five years old, and it may be bad form to bump it, but I'm fairly new to Arizona and wonder if, in the five years since the topic was first raised, somebody may have joined the board who can provide some insight on this.

Does anybody know why the mileposts on Arizona's state and US highways are numbered the way they are?

It's perplexing to see low numbered mileposts on highways like SR 82 and 83, and US 191, but numbers over 300 on relatively short routes like SR 90 and 92.

If someone has some history and/or background on this, it would sure be appreciated.
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Roadwarriors79

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Re: Arizona Mileposts
« Reply #6 on: July 14, 2019, 10:12:07 PM »

This link show's Arizona's current state highway system. Don't know when it was last updated.

https://www.azdot.gov/docs/mvd-services/state-milepost-system-maps.pdf

In the past, some routes would just continue the mileage from another route. Also, some US routes were decomissioned, but their mileposts were retained even if the number changed.

Some examples:
-- I-17 from Cordes Junction to Phoenix inherited its mileposts (and exit numbers) from AZ 69. AZ 69, when it went to Phoenix, branched off of old US 89 near its milepost 201.
-- AZ 85 north of I-8 replaced part of old US 80, but the mileposts from US 80 were retained.
-- AZ 89 used to be US 89. Even though the number changed, the old mileposts for US 89 were retained.
-- US 60 used to go into California. It was replaced by I-10. The western beginning of US 60 continues the mileposts of I-10 near Brenda.


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