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Idaho's Only Seaport
Southway/Snake River Ave Roundabout
The department along with Horrocks Engineers and Riedesel Engineering received two awards at the American Council of Engineering Companies (ACEC) of Idaho 2013 Engineering Excellence Awards.

Awards received were 1st place in Small Projects for the Snake River Avenue/Southway Avenue Roundabout and 1st place in Water and Stormwater for the FEMA Stormwater Drainage Mitigation project in downtown Lewiston.

ACEC Awards

Project complete October 2013.

Update 10/21/13:
A ribbon cutting ceremony will take place on Wednesday, October 23 at 5:15 p.m.      
Update 10/4/13:
Due to an equipment malfunction Thursday night, the traffic revision will take place again on Friday evening, October 4 beginning at 8:00 p.m.  This revision will close the intersection to finish the permanent traffic control striping.  This detour is expected to last until 11:00 p.m.  Questions regarding this closure should be directed to the Project Engineer at 208-305-2517.     
Update 10/2/13:
A traffic revision at the intersection of Southway and Snake River Avenues will take place on Thursday evening, October 3 beginning at 8:00 p.m.  This revision will close the intersection to allow for the permanent traffic control striping to be placed.  This detour is expected to last until midnight October 3. Don't forget to watch the videos illustrating how to navigate a roundabout (bottom right-hand corner).
Update 9/27/13:
The traffic revision at the intersection of Southway and Snake River Avenues scheduled to last until Friday, September 27 at 10 AM has been extended.  This revision will allow crews to work on concrete pavement.  The work requires prohibiting the movement through the intersection for northbound traffic.  This is the only prohibited movement.   Watch for signage that will detour trucks to 21st Street and passenger vehicles to 11th Avenue.    

This detour is now expected to be in place until early next week  

Update 9/25/13:
A traffic revision at the intersection of Southway and Snake River Avenues will take place on Thursday evening, September 26 beginning at 8:00 p.m.  This revision will allow crews to work on concrete pavement.  The work requires prohibiting the movement through the intersection for northbound traffic.  This is the only prohibited movement.   Watch for signage that will detour trucks to 21st Street and passenger vehicles to 11th Avenue.   

This detour is expected to be in place until Friday, September 27 at 10 AM.  
Update 9/12/13:
Evening closures planned! The intersection will be closed every evening next week starting Monday, September 16, 2013 through Friday, September 20, 2013. The evening closures will start at 8:00 p.m. and be reopened at 6:00 a.m. the following morning. Crews will be working on concrete curb for splitter islands, concrete pavement, and permanent pavement markings and stripping.

Intersection work is scheduled for completion in early October! We continue to appreciate everyone's cooperation and patience as we finish this project. Remember, it is still a construction zone with reduced speeds! 

Update 8/28/13:
This complimentary aerial photo was taken last Saturday by Northwest Aerial Systems and given to the City!  What a great view!  Thank you Northwest Aerial Systems!

Snake River Ave Roundabout Aerial.jpg


                    Update 8/15/13:

Upcoming night closures starting Monday August 19 through Thursday, August 22nd between the hours of 8 p.m. and 6 a.m.  Grading and base placement will take 3 nights, ending with asphalt paving on Wednesday and Thursday.  Just in time for Hot August Nights!

We continue to thank you for your patience and cooperation!

Update 8/12/2013:

Work continues at the Southway/Snake River Avenue Roundabout.  Crews are continuing to place concrete sidewalk, curb, and approaches; grading and base placement; and utility installation.  Although contract time allows for completion in November, we are anticipating an earlier completion date!  

The last concrete pavement placement is scheduled for Tuesday and Thursday, August 13 and 15.  Before this week is over, you can expect another shift in the traffic pattern to accommodate this last concrete paving operation.  

Asphalt pavement is scheduled for the nights of August 21 and 22 and will require a night closure of the intersection between the hours of 8:00 p.m. and 6:00 a.m.

We continue to thank you for your patience and cooperation!

Update 7/23/2013:
Work continues to progress well.  Your continued patience and cooperation is appreciated!  The majority of the curb and gutter work has been placed.  The contractor continues to keep us moving through the area and we need to continue to remember this is an active construction site.  We need to be mindful of the posted speed limit and pay close attention to traffic control changes, equipment, and workers as we travel through.  Once the concrete placed on the west of the intersection has had time to cure and then passes required strength tests, traffic will be shifted to the west.  Meanwhile, stormwater, electrical, and grading work will continue.

Update 7/15/2013:
Construction continues to move forward.  Concrete paving work is occuring this week and then the concrete will need to cure for a time.  The construction crew appreciates your caution as you travel through the area.  Remember this is a construction zone and we need to follow posted speed for everyone's safety!  Thanks!

Concrete paving in the roundabout.

Looking down at project site from Prospect.

Update 7/2/2013:
Weekend closure work is completed!  There will not be any more weekend closures.  We appreciate and thank you for your cooperation and patience during the closures!  Traffic patterns through the area will change every few weeks, so be cautious if you are traveling through the intersection.

Check the project history since 1997 by clicking here. You will find Citizen Advisory Group information, meeting summaries, presentations, public open houses, workshops, similar completed roundabout photos, and more! Check it out today!

Update 6/27/2013:
Construction continues.  Thank you for your continued patience.

Update 6/10/2013:
The three-way stop was implemented last week.  

The first weekend closure will be this weekend, Friday, June 14, 8 PM thru Monday, June 17, 6 AM. This closure is necessary to remove pavement, install large diameter storm water pipe, build the intersection up several feet to subgrade, and laydown a temporary driving surface.  The second weekend closure is planned for the following weekend, Friday, June 21, 8 AM thru Monday, June 24, 6 AM.

Weekend Closure Detour maps have been prepared to assist you in detouring around this intersection.  One map simply shows the detour route and the second one is the engineer's drawing of the detour.

Also, check out the drawing titled "The Roundabout" (menu item on right) illustrating the completed roundabout.
Update 5/31/2013:
Project starts Monday, June 3!  Your patience is appreciated during this project.  You can expect traffic delays for the duration of the project.  Check the project history (link above) to see examples of what the finished project will be similar to.  The video link (right side menu area) provides a visual illustration of pedestrians and vehicles using a roundabout.

Update 5/21/13:
This is a major project for our valley that will affect almost all of us.  Your patience and cooperation will be appreciated.  Please let us know of any concerns you have.

Take a moment to view the roundabout simulation (menu on right) and the roundabout informational brochure (also menu on right).

Construction starts Monday, June 3, 2013 lasting through November 2013.  Some things that will start right away are:

  • The traffic signal will be removed the first week and replaced with a three-way stop sign during construction.  The only way through the intersection will be through the three-way stop.
  • Prospect Avenue between 19th Ave and Southway Ave will be closed for the duration of construction.
  • Access to the levy trail system at Southway will be closed at 1st Street.  You will not have access to the levy trail from the Southway trail.  The levy trail that runs along Snake River Avenue will remain open during construction.
  • At times during construction, the intersection will be closed to all traffic overnight as allowed.  This means from 8:00 p.m. to 6:00 a.m.  Follow updates to this page to be notified when overnight closures will occur.
  • Two times during construction the intersection will be closed to all traffic over a weekend period.  This means from 8:00 p.m. on a Friday to 6:00 a.m. on a Monday.  The first will occur the weekend of June 7 (Update 5/31:  changed to June 14) and the second is yet to be determined.  Follow updates to this page to be notified when the next weekend closure will be. 

There are several ways to stay informed:

  • Be our friend! Lewiston Public Works on Facebook
  • Sign up for Public Works Project updates at through e-Services (menu item on left side of main page)
  • Use the RSS found on this page (upper right)
  • Call or email the Project Contact shown in the right menu. 

You are encouraged to avoid the intersection if at all possible.  Alternate route maps will be posted to this website for your information.  Sign up for update notifications to stay advised.

Update 4/16/13:

Construction to start 6/1/2013.

General Description

Since 1997, the Public Works Department has been busy working through the process of planning improvements for the Southway Avenue and Snake River Avenue. The first phase of construction consists of improving the intersection of Southway and Snake River Avenues and environmental work for the remaining phases, which include Snake River Avenue between U.S. 12 and Bryden Canyon Road On-Ramp, and Southway between Snake River Avenue and 8th Street. 

The City is finalizing the design of the roundabout at the intersection of Snake River Avenue and Southway Avenue after an extensive Environmental Assessment process.  Federal funding for construction of the intersection was moved up from FY 2013 to FY 2012. 

Coordinating work continues with all the governmental agencies involved, design plans are being finalized so that a bidding document can be prepared. 

If you are interested in the history of this project, the Environmental Assessment document, and the Advisory Committee work, all of this information is available on the Idaho Transportation Department's public involvement web site.  Click here to access!

Public involvement and participation has been and continues to be an important component of this project.  Please review the list below!  Your comments and concerns are important!  Please feel free to contact us with any questions, concerns or comments.  You can call, email, or stop by.  We want to hear what you have to say!

Project Timeframe
  • Project Planning began:  1997 
  • Funding Application submitted:  2002
  • Funding Awarded and Presented to Council:  2004
  • Engineering Consultant Selected: 2004
  • Initial Design/Scoping:  2004
  • Environmental and Preliminary Design:  2005-2008
  • Citizen Advisory Group Formed/Completed Work: 2004-2006.  Click link to find information about work the Advisory Group accomplished during this time period:  Group members, Meeting summaries, slide presentation to Council, and video.
  • Public Meetings:  2005 - 2008.  Click link for information and find Public workshop on 2/24/05; Public Open House on 3/30/06; and Public Hearing on 1/8/08. 
  • Final Design of Roundabout:  2008-2009
  • Constructed Drainage Pond:  Summer 2011
  • Council approved State/Local Construction Agreement 6/2012
  • Roundabout Rebid - Opened 4/9/2013 
  • Construction Anticipated to begin 6/1/2013
  • Completion November 2013   

Project Funding:
This project is funded by 92.66% Federal Highway grant funds and 7.34% local funds.
 SRA-Sthway Roundabout.jpg

Project Manager
Alannah Bailey, PE
Asst. Engineer

215 D Street
P O Box 617
Lewiston, ID  83501
Public Works Department
Click here for video simulation of driving this roundabout!  (allow a few minutes for video to load using Windows Media Player)

Drawing:  The Roundabout

Roundabout Information Brochure

Videos!  How to navigate a roundabout as a pedestrian, on bikes, and in vehicles!

4:18 minute YouTube video from the Missouri DOT
3:23 minute YouTube video from the Michigan DOT

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