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I-5 Study Report 2020

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WSDOT presentation to Nisqually River Council

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I-5 Study Report 2020

  1. 1. Interstate 5: Tumwater to Mounts Road Mid- to Long-Term Strategies Nisqually River Council December 20th, 2019 Dennis Engel Matthew Pahs Olympic Region Multimodal Planning Manager Principal Senior Planner
  2. 2. 2 Funding legislation $550,000 in state and local funds to identify potential improvements between exit 116 and exit 99 of Interstate 5. The study should • further develop mid- and long-term strategies, • identify potential US101/I-5 interchange improvements, • a strategic plan for the Nisqually River bridges, • regional congestion relief options, and • ecosystem benefits to the Nisqually River estuary for salmon productivity and flood control -Engrossed Senate Substitute Bill 6106 Session Law, 2018 Regular Session
  3. 3. 3 Study area limits • Southern end point: Exit 99 – SR 121/93rd Ave • Northern end point: Exit 116 – Mounts Road • Included I-5 between Mounts Road and Main Gate at JBLM in travel time measures • Included all of Thurston County and parts of Pierce County for regional measures such as VMT
  4. 4. 4 Study purpose and goals I-5 and major connecting routes between Tumwater and Mounts Road affect our region’s economic vitality, accessibility and mobility, defense operations, and the environment. This segment of I-5 is experiencing increasing congestion. Performance-based strategies are needed to satisfy the following goals (not listed in order of priority): • Improve travel times and reliability • Increase the ability to safely, efficiently, and equitably move all people (multimodal) and goods, and manage corridor capacity as an asset • Improve accessibility to industrial areas, commercial areas, and job sites • Protect and enhance the environment including reducing the transportation and estuarine habitat constraints related to the Nisqually River Bridges and the river’s delta. • Improve network redundancy and resiliency
  5. 5. 5 Modeling Scenarios Scenarios Examples of modeled strategies Operations • Extra lane at Nisqually Interchange • Roundabouts on SR 507 near Yelm Land Use • Sustainable Thurston – growth concentrated in urban centers and corridors Travel demand management • Increased parking rates in urban core • Increased telework and schedule shifts Transit • Full implementation of Intercity Transit’s long-range strategic plan Hard shoulder running • Peak period general purpose shoulder use on I-5 between Sleater- Kinney and Henderson HOV conversion • Convert one existing general purpose lane to HOV from US 101 through 38th in Tacoma Interchange improvements • Braided ramp at US 101 and I-5 • Martin Way interchange reconfiguration Capacity expansion – HOV • Add 4th lane through study area as an HOV lane Capacity Expansion – General purpose • Add 4th lane through study area as a general purpose lane
  6. 6. 6 Performance measures Study goal areas Performance measures Travel times and reliability  Corridor travel times  Maximum Throughput Travel Time Index (all traffic, HOV) Multimodal efficiency & equity  Corridor person throughput (all traffic, HOV)  County-wide mode split  County-wide vehicle miles traveled  Traffic Balance on I-5 (percent through traffic)  Access for Environmental Justice populations (poverty, minority, disability, no vehicle access) Accessibility  County-wide access (SOV, HOV, & Transit) to o Jobs o Commercial services  Travel times on selected freight access routes Environment  Greenhouse gas emissions Resiliency  Qualitative comparison “Improves availability and/or capacity of alternate routes”  Travel times on alternate routes through study area
  7. 7. 7 Modeling Used a practical solutions approach • Modeled lower cost strategies first such as operations and TDM Included all improvements from previous scenarios • Exception – Widening scenarios did not include Hard Shoulder Running • Did this to see cumulative effect of lower cost strategies
  8. 8. 8 Modeling – 2040 baseline scenario Mounts Road
  9. 9. 9 Modeling – 2040 baseline scenario – US 101/Plum
  10. 10. 10 Draft strategy recommendations Scenario Priority Draft recommendations Land Use 1 Recommended short-term/mid-term/ongoing Transit 2 Recommended short-term/mid-term/ongoing Travel Demand Management 3 Recommended short-term/mid-term/ongoing Operations 4 Recommended short- and mid-term Hard Shoulder Running 5 Recommended mid-term Interchange Improvements 6 Recommended mid-term/long-term HOV Conversion 7 Recommended mid-term Capacity Expansion I-5 - HOV1,2 8 Consider long-term Capacity Expansion I-5 All GP2 - Not recommended Short-term (0-4 years), mid-term (5-9 years), long-term (10-20 years) Unless otherwise noted, scenarios included all improvements from previous scenarios 1 The benefits of HOV lanes are accounted for in the HOV conversion scenario, the Capacity Expansion I-5 – Add GP Lane, Retain HOV Lane adds general purpose capacity not an HOV lane 2 Does not include Hard Shoulder Running, instead has permanent auxiliary lanes
  11. 11. 11 Hydrologic Study WSDOT and the Nisqually Indian Tribe fully funded this study ($150,000 each) Nisqually Tribe working with USGS • Updating & validating modeling • Analyzing historic water levels, storm surge, wave heights, and extreme flood events Draft results expected in November
  12. 12. 12 Next steps Next steps for this study • Public engagement in late November/early December • Report review in December Planning Environmental Linkages Study • WSDOT has advertised a Request for Qualifications • Expect consultant selection in January • PEL study will further refine solutions in cooperation with resource agencies Project webpage: https://www.wsdot.wa.gov/planning/studies/i5/tumwater-mounts-road/home

WSDOT presentation to Nisqually River Council

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