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For I-29/I-229 and I-90/I-229 Interchange Improvements

Public Meeting – July 17, 2008
Update to MPO Committees - 1-16-2008    - Windows Media File. Note: This is a Powerpoint presentation that has been converted to streaming media to make it easier to view. There is no audio.

The SDDOT is currently looking at safety, capacity and access alternatives for the areas surrounding the interchanges listed above. The focus of the work encompasses needs in the area, engineering feasibility, cost and environmental impacts. As the study progressed, land development announcements in the vicinity of the I-29/I-229 interchange have compelled the Department to separate that interchange from this study and look at the entire I-29 corridor independently. Information on the work done as part of the I-29 Corridor Study since January 1, 2008, can be accessed at http://www.sddot.com/pe/projdev/planning_ss_I29.asp. Information on what was done prior to January 1, 2008, can be found below.

Listed below are the different design options presented by URS Corporation. (all links are Adobe PDF Files)
Slide Presentation


Slide Presentation from the 3/30/06 Public Meeting


I-29 / I-229 Options


57th Diamond Button Hook

57th Folded Diamond

57th Folded Diamond Button Hook

57th Single Point

57th Split Diamond

57th Tight Urban Diamond

I-29/I229 Alternate 1 Small

I-29/I229 Alternate 2 Small

I-29/I229 Alternate 2A Small

I-29/I229 Alternate 2B Small

I-29/I229 Alternate 2C Small

I-29/I229 Alternate 2C Modified 1 Small

I-29/I229 Alternate 3 Small

I-29/I229 Alternate 4 Small

I-29/I229 Alternate 4A Small

I-29/I229 Alternate 11 Small

I-29/I229 Alternate 12 Small

I-29/I229 Arterial Improvements Small


I-90 / I-229 Options


I-90/I-229 Alternate 1 Small

I-90/I-229 Alternate 1A Small

I-90/I-229 Alternate 2 Small

I-90/I-229 Alternate 2A Small

I-90/I-229 Alternate 3 Small

I-90/I-229 Alternate 3A Small

I-90/I-229 Alternate 4 Small

I-90/I-229 Alternate 4 Modified Small

I-90/I-229 Alternate 6 Small

I-90/I-229 Alternate 6 Modified Small

I-90/I-229 Alternate 20A Small

I-90/I-229 Alternate 20B Small

For more information or comments please contact Bill Troe at URS Corporation by e-mail or Toll Free at 1-800-671-5309.



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