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Interstate 685
Future I-685 highlighted in red
Route information
Maintained by ALDOT
Length15.011 mi[1] (24.158 km)
HistoryDesignation approved in 2010
Major junctions
West end I-65 in Montgomery
  US 80 in Montgomery
East end Future I-85 (SR 108) / US 80 in Montgomery
Highway system
  • Alabama Highways
SR 605 I-759

Interstate 685 (I-685), is the designation for a future Interstate Highway in the U.S. state of Alabama. When completed, it will connect I-65 in downtown Montgomery to I-85 in the eastern suburbs of Montgomery. The routing is currently signed as I-85.

Route description

Currently, I-685 has been approved by the American Association of State Highway and Transportation Officials (AASHTO) to be co-signed with the current I-85 from its current southern terminus at I-65, to the future location of the Montgomery South Bypass on which I-85 will be rerouted.[2] The open section of Future I-85 is temporarily designated as State Route 108. Future Interstate 685 is currently signed as Interstate 85.


The designation was approved in 2010 at the request of the Alabama Department of Transportation (ALDOT) to use existing I-85.[2] Construction on the Montgomery Outer Loop started in early 2011, and the first part of it was completed in February 2016.[3] When done, the I-85 designation will be shifted to the Outer Loop, and the existing freeway will become just I-685.[4] This will be the first auxiliary interstate of Interstate 85 that starts with a six.[5]

Exit list

The entire route is in Montgomery, Montgomery County.

0.0000.000 I-65 / US 82 (SR 6) / Day Street west – Mobile, BirminghamSouthern terminus; I-65 exit 171; no access from eastbound Day Street to southbound I-65 or from northbound I-65 to Day Street; future western terminus of I-685
0.7901.2711Court StreetNorthbound exit and southbound entrance
1.2902.0761Union StreetSouthbound exit and northbound entrance
2.1303.4282Forest AvenueNorthbound exit and southbound entrance
2.3203.7342Mulberry StreetSouthbound exit and northbound entrance
3.0044.8343Ann Street
4.7347.6194Perry Hill Road
6.54610.5356 US 80 west (SR 8 west) / US 231 (SR 53) / SR 21 (East Boulevard)Southern end of US 80 / SR 8 concurrency
SR 271 (Taylor Road) to US 231 (SR 53)
Auburn University at Montgomery
11.00917.71711 SR 110 / SR 126 (Atlanta Highway) – Mitylene, Mount Meigs
15.01124.15815 Future I-85 / US 80 east – Atlanta, MeridianFuture I-85 rerouting; future eastern terminus of I-685
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also


  1. ^ a b Alabama Department of Transportation. "Milepost Maps" (PDF). Retrieved May 22, 2020.
  2. ^ a b Special Committee on U.S. Route Numbering (October 29, 2010). "Report to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017. Retrieved December 13, 2011.
  3. ^ Burylo, Rebecca (January 25, 2016). "1st phase of Montgomery's Outer Loop opens". The Montgomery Advertiser. Retrieved October 26, 2019.
  4. ^ "Montgomery Outer Loop's first phase complete; ribbon cutting ceremony set". WSFA 12 News. January 25, 2016. Retrieved October 26, 2019.
  5. ^ Shryock, John. "Outer Loop construction about to restart". Montgomery, AL: WSFA-TV. Retrieved December 13, 2011.
  6. ^ Alabama Department of Transportation. "General Highway Maps" (PDF). Retrieved May 22, 2020.

Route map: