PRESENTATION WILL BEGIN AT APPROXIMATELY 6:05 P.M. I-90 EXIT 406 INTERCHANGE MODIFICATION STUDY AND ENVIRONMENTAL ASSESSMENT MARKET

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1 PRESENTATION WILL BEGIN AT APPROXIMATELY 6:05 P.M. MARKET I-90 EXIT 406 INTERCHANGE MODIFICATION STUDY AND ENVIRONMENTAL ASSESSMENT JANUARY 23, 2017 Public Meeting & Open House #2

2 TODAY S MEETING Purpose: Gather feedback for further refinement and screening of Build Alternatives. 1. Overview of study 2. Interchange and Corridor Alternatives development process 3. Presentation of Interchange and Corridor Build Alternatives No preferred alternatives have been identified at this point

3 STUDY TEAM Study Advisory Team South Dakota Department of Transportation (SDDOT) Federal Highway Administration (FHWA) Sioux Falls Metropolitan Planning Organization (MPO) City of Brandon Study Consultant HR Green Short Elliott Hendrickson (SEH) 106 Group

4 INTERCHANGE IMPROVEMENTS TIMELINE Study Design Construction letting in FY

5 ENVIRONMENTAL ASSESSMENT A. To determine the significance of impacts from proposed action A. Establish Purpose and Need B. Develop and evaluate alternatives C. Identify significance of environmental outcomes D. Resource agency consultation and public involvement B. Conclusion - EIS or FONSI

6 INTERCHANGE MODIFICATION JUSTIFICATION REPORT (IMJR) A. 8 policy requirements for new or change in access A. Sufficient design and support to substantiate request B. Detailed technical analysis B. Concurrent with and feeds into Environmental Assessment

7 STUDY AREA I-90 Exit 406 Interchange SD 11 / Splitrock Blvd

8 STUDY ACTIVITIES AND SCHEDULE A. Establish issues and needs B. Concept development and initial screening C. Refine Build Alternatives and analysis D. IMJR and EA development; identify proposed Preferred Alternative Complete Complete In progress February 2017 February 2017 July 2017

9 ALTERNATIVES DEVELOPMENT Future-year traffic volumes NB to WB movement EB to SB movement Ramp terminal intersection sight angles Vehicle-vehicle conflict locations Large truck turning movements Continuous pedestrian/bicycle accommodations On- and off-ramp lengths

10 ALTERNATIVES DEVELOPMENT Maintenance of traffic Full closure with detour routes Temporary bridge Existing bridge

11 PRELIMINARY CONCEPT SCREENING A. Interchanges: 11 B. Corridors: 4 C. Notable differentiators Transmission tower impacts Right-of-way needs Bridge area Cost Cultural resources 4 Build Alternatives Carried Forward 3 Build Alternatives Carried Forward

12 BUILD ALTERNATIVES Interchange Alternatives Corridor Alternatives

13 STANDARD DIAMOND I-90 EXIT 406 INTERCHANGE Signalized ramp terminals Dual NB to WB left-turn lanes Free EB to SB right-turn Maintain traffic via temporary bridge or detours

14 STANDARD DIAMOND SHIFTED WEST I-90 EXIT 406 INTERCHANGE Similar to Standard Diamond Maintain traffic via existing bridge

15 STANDARD DIAMOND W/ ROUNDABOUTS SHIFTED WEST I-90 EXIT 406 INTERCHANGE Roundabout intersections Dual NB to WB lanes Free EB to SB right-turn Maintain traffic via existing bridge

16 DIVERGING DIAMOND I-90 EXIT 406 INTERCHANGE Similar to Standard Diamond Free NB to WB left-turn Free EB to SB left-turn Maintenance of traffic on existing bridge or temporary bridge

17 5-LANE UNDIVIDED Full access intersections Proposed access modifications SD 11/SPLITROCK BLVD CORRIDOR Sidewalk & bicycle accommodations on both sides

18 4-LANE DIVIDED SD 11/SPLITROCK BLVD CORRIDOR ¾ access TBD intersections Raised TBD median Similar sidewalk & bicycle accommodations as 5-lane 9 th Avenue and Redwood Blvd

19 BACKAGE ROADS SD 11/SPLITROCK BLVD CORRIDOR Provide business access via Express Avenue Varying levels of reconstruction

20 NORTH OF I-90 Retain existing corridor Access modifications SD 11/SPLITROCK BLVD CORRIDOR Potential shared-use path Hemlock Blvd intersection

21 HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR Ease truck turn No conflicts avoided in NB direction

22 HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR Widened to the west No conflict with NB thru traffic Property impact

23 HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR No conflict with NB thru traffic

24 HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR No conflict with NB thru or left-turn traffic

25 HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR Traffic control/warning alternative, examples include: Intersection conflict warning system Signalized control

26 TODAY S INVOLVEMENT OPPORTUNITIES No preferred alternative has been selected yet Please provide feedback on the developed alternatives Will help in further refinement and screening Comments Leave comment form at entryway Mail/ comment form to project contact Discuss with project representatives Submit comment via project website Due by February 6

27 THANK YOU! Project Website Next Public Meeting: Spring/Summer 2017 Project Contacts Jon Wiegand, PE, PTOE Consultant Project Manager HR Green, Inc Steve Gramm, PE SDDOT Project Manager South Dakota Department of Transportation

I-90 Exit 406 Interchange Modification Study and Environmental Assessment. Public Involvement #2

I-90 Exit 406 Interchange Modification Study and Environmental Assessment Public Involvement #2 January 23, 2017 Holiday Inn Express Convention Center Brandon, SD Public Comments Summary Public Meeting