US-412 highway upgrades and bypass (a.k.a. AR-612) in NWA: the thread

[Great Lakes Roads]

The final phase of the Springdale Northern Bypass was awarded a $24.4 million BUILD grant.

The construction start on that segment is estimated to be in December 2028.

https://www.transportation.gov/sites/dot.gov/files/2025-07/BUILD%202025%20Round%202%20Fact%20Sheets_1.pdf

[The Ghostbuster]

There was an article last year that said construction on the final segment of the Springdale Northern Bypass wouldn't start until 2040 or later: https://nwacouncil.org/2024/08/29/412-bypass-aerial-2024/#:~:text=When%20completed%20in%20August%202026,the%20region's%20fast-rising%20population. If it does start in 2028, that will be an improvement.

[CoreySamson]

Here are a couple of pictures I took on Saturday of the AR 612 project:

At the future US 412/AR 612 interchange west of Tontitown


At the AR 112/AR 612 interchange

The eastern end of the project looks paved and ready to go.

[TBKS1]

I drove by this about like three weeks ago and it already looked close to being done, I know this project is months ahead of schedule, I'll probably make a trip back up there once it's open.

[The Ghostbuster]

It will be great once the western leg of AR 612 and the extension of Airport Blvd. are completed. The bad news is that we will have to wait a long time for the eastern leg to be completed. I wish they could complete it sooner.

[Wayward Memphian]

Been driving US 412 quite a bit lately. Huntsville to Alpena needs addressed quickly. It is getting unbearable.

[Plutonic Panda]

I went on Google maps to look at this section you're talking about. I noticed the aerial imagery has been updated to show the construction of several new freeways. It's all coming along very nicely.

[MikieTimT]

Highway 265 to Highway 412 Springdale Bypass  Benton and Washington Counties  Job 012366 Public Involvement Meeting - January 22, 2026

Last Public Involvement Meeting for the last project to complete the Springdale Northern Bypass (AR-612).  Looking like they're making this a priority to get at least the start of last of the construction project kicked off this decade.

[TBKS1]

I don't think this has been shared here yet, but the XNA airport connector will officially be signed as AR 642 upon its designation. Me and a few friends discovered this in the ARNOLD data map earlier today.

ARNOLD map including proposed routes (click this)

[Road Hog]

I don't think this has been shared here yet, but the XNA airport connector will officially be signed as AR 642 upon its designation. Me and a few friends discovered this in the ARNOLD data map earlier today.

ARNOLD map including proposed routes (click this)

Interesting ... so it's likely to become an I-x42 spur. Or maybe even an I-x42 loop if they extend it and make it the start of a planned NWA beltway.

[Bobby5280]

With an AR-642 designation, I would hope the final product would be a loop highway. It would be weird for an "I-642" highway to be a spur route. I guess we should be happy they're not picking out random 3 digit designations that have no parent 2-digit route like we're now doing in Joke-la-homa.

[TBKS1]

Interesting ... so it's likely to become an I-x42 spur. Or maybe even an I-x42 loop if they extend it and make it the start of a planned NWA beltway.

Yeah I do think that was a deliberate numbering choice given the Springdale Bypass is expected to become part of the future Interstate 42, but I wouldn't get my hopes up on that being signed as an Interstate highway spur any time soon. It is going to be a four lane expressway for its entire length up to AR 264, but I have no idea on plans past that at all, or whether or not the AASHTO has said anything about the spur route either. As far as I'm aware (for now), this is just a connector route to XNA airport.

[Great Lakes Roads]

https://www.5newsonline.com/article/news/local/northwest-arkansas-commission-study-tolls-i-42-funding-easing-local-cost-burdens/527-4bf005f4-c449-4de2-9838-5d5f5982f0fa

I-42 to become a toll road in NWA? What do y'all think?

Cross-posting this from the Arkansas thread.

[bugo]

https://www.5newsonline.com/article/news/local/northwest-arkansas-commission-study-tolls-i-42-funding-easing-local-cost-burdens/527-4bf005f4-c449-4de2-9838-5d5f5982f0fa
I-42 to become a toll road in NWA? What do y'all think?

It would be wasteful to build a freeway on new location between the east side of Siloam Springs and the end of the Springdale bypass. US 412 is a 4 lane divided expressway with wide medians and good sight lines. It wouldn't take a whole lot to get it to I-standards. Some bridges, frontage roads and a couple of interchanges is all it needs.

[splashflash]

https://www.5newsonline.com/article/news/local/northwest-arkansas-commission-study-tolls-i-42-funding-easing-local-cost-burdens/527-4bf005f4-c449-4de2-9838-5d5f5982f0fa
I-42 to become a toll road in NWA? What do y'all think?

It would be wasteful to build a freeway on new location between the east side of Siloam Springs and the end of the Springdale bypass. US 412 is a 4 lane divided expressway with wide medians and good sight lines. It wouldn't take a whole lot to get it to I-standards. Some bridges, frontage roads and a couple of interchanges is all it needs.

The interstate design doesn't show a new freeway alignment, only around Siloam Springs, so that bypass section could be the proposed tolled section, similar to the Cherokee Turnpike.

[The Ghostbuster]

If any of existing US 412 west and east of Siloam Springs is utilized, the eastern end of the Cherokee Turnpike should be reconfigured, so traffic doesn't have to exit to continue westward on US 412/future Interstate 42.

[MikieTimT]

Interesting ... so it's likely to become an I-x42 spur. Or maybe even an I-x42 loop if they extend it and make it the start of a planned NWA beltway.

Yeah I do think that was a deliberate numbering choice given the Springdale Bypass is expected to become part of the future Interstate 42, but I wouldn't get my hopes up on that being signed as an Interstate highway spur any time soon. It is going to be a four lane expressway for its entire length up to AR 264, but I have no idea on plans past that at all, or whether or not the AASHTO has said anything about the spur route either. As far as I'm aware (for now), this is just a connector route to XNA airport.

For now, but this project for the longest time, despite the claims to the contrary, seems a shoe-in for a Benton County western beltway, which would logically extend northward from AR-264 past the airport up to the bend in the Bella Vista Bypass.

[TBKS1]

So I actually knew about this and totally forgot to post about it here. This does contradict what I said, but this would still probably take 30 years at the earliest to be completed, but yeah that does appear that the AR 642 designation was absolutely chosen as an auxiliary to the future I-42 that will follow the Springdale bypass extension.