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
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
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
INTERCHANGE IMPROVEMENTS TIMELINE Study 2016-2017 Design Construction letting in FY 2022-2025
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
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
STUDY AREA I-90 Exit 406 Interchange SD 11 / Splitrock Blvd
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
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
ALTERNATIVES DEVELOPMENT Maintenance of traffic Full closure with detour routes Temporary bridge Existing bridge
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
BUILD ALTERNATIVES Interchange Alternatives Corridor Alternatives
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
STANDARD DIAMOND SHIFTED WEST I-90 EXIT 406 INTERCHANGE Similar to Standard Diamond Maintain traffic via existing bridge
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
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
5-LANE UNDIVIDED Full access intersections Proposed access modifications SD 11/SPLITROCK BLVD CORRIDOR Sidewalk & bicycle accommodations on both sides
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
BACKAGE ROADS SD 11/SPLITROCK BLVD CORRIDOR Provide business access via Express Avenue Varying levels of reconstruction
NORTH OF I-90 Retain existing corridor Access modifications SD 11/SPLITROCK BLVD CORRIDOR Potential shared-use path Hemlock Blvd intersection
HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR Ease truck turn No conflicts avoided in NB direction
HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR Widened to the west No conflict with NB thru traffic Property impact
HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR No conflict with NB thru traffic
HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR No conflict with NB thru or left-turn traffic
HEMLOCK INTERSECTION SD 11/SPLITROCK BLVD CORRIDOR Traffic control/warning alternative, examples include: Intersection conflict warning system Signalized control
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/email comment form to project contact Discuss with project representatives Submit comment via project website Due by February 6
THANK YOU! Project Website www.sehinc.com/online/406 Next Public Meeting: Spring/Summer 2017 Project Contacts Jon Wiegand, PE, PTOE Consultant Project Manager HR Green, Inc. 605-221-2656 jwiegand@hrgreen.com Steve Gramm, PE SDDOT Project Manager South Dakota Department of Transportation 605-773-6641 steve.gramm@state.sd.us