State Route 37 Transportation and Sea Level Item 8 Rise Corridor Planning Update

TRANSPORTATION AUTHORITY of MARIN BOARD Meeting: September 27, 2018

1 MTC SR 37 Transportation & SLR Corridor Improvement Plan Item 8 Started in January 2017 – Completed in March 2018

22 Goals and Objectives Item 8

Integrate transportation, ecosystem and sea level rise adaptation into one design Improve mobility across all modes and maintain public access Increase corridor for resiliency to storm surges and sea level rise

33 100 Minutes to Travel Back Home Every Day Item 8

• 6 Hours of Congestion During Weekday AM Commute (Westbound)

• 7 Hours of Closely Spaced Merge Congestion During and Lane Drop Weekday PM Commute (Eastbound)

• Weekend Congestion Throughout Most of the Day

• No Transit Services Source: Kimley-Horn, 2017. 44 Parts of SR 37 Already Flood During Heavy Storms Item 8 Recent Floods in Spring, 2017

• 6 known Weak Links

Are Most Novato Creek Levees Vulnerable to Short Term Flooding and Eventual SLR

Port Sonoma

Novato Creek and Weak Links Rd Tubbs Island Mare Island

Source: AECOM, 2017. 55 Majority of SR 37 Will Be Inundated Item 8 by 2050 Conditions with Sea Level Rise & Storm Surges

• Year 2100 Sea Level Rise Scenario

• Permanent Inundation Expected by 2050: Segment A and Segment B from SR 121 to

• SR 37 Closure would Divert Traffic to Other Already Congested Routes: I-80, US 101, I- 580, SR 12, SR 121, etc.

• State and Federal- Protected Species Lose

Habitat 6 Source: UC Davis, AECOM, 2015. 6 Many of the Adjacent Levees Protecting SR 37 Are Privately OwnedItem 8

• Private Levees Not Constructed Specifically B1 Sonoma Creek for Protecting SR 37 Cullinan . Ranch Ancillary Benefit for B2 SR 37 A2

Tubbs C . Challenges with Sears Island Point Tolay Maintaining and A1 Creek Petaluma River National Wildlife Upgrading Private Refuge Levees Novato Creek • A Number of Low SR 37 Protected SR 37 is Raised By Levees and Act as a Levee Elevation Hotspots Along Corridor

7 Source: AECOM, 2017. 7 SR 37 Rich with Wetlands, Baylands, and State and Federally-ProtectedItem Species 8

88 Recreation Destination - Bicycle / Pedestrian Access Item 8

99 A High-Level Assessment of SR 37 Corridor Improvement Needs:Item 8

• A Raised/Elevated Roadway • Ecological Enhancement • Hydrological and Wildlife Connectivity • Living Levees that Provides Habitat Opportunities

• Improve Capacity in Segment B • New Managed Lane(s)

• Multimodal and Local Access Improvements • Improve Bay Trail/Bike Access, Provide Transit Service

• Local Access Improvements • Intersection and Interchange Improvements - SR 121, Mare Island, Lakeville Highway and Vallejo/Fairgrounds

1010 demand for SR 37] accommodate travel options alone would not strategies. and Rail ferry feasible[No retreat RetreatFerry Alternative AlternativeRail alternative roadways Adaptive on Capacity Evaluation Process - Transportation Strategies for SR 37

- - - - Protect ProtectionFlood Improvements Operational - Roadway Maintain Existing Nature Marshland Restoration Building Seawall Levee Improvements - Based Solutions Based

Planning Advanced MitigationAccommodate Ecosystemand Design Integrated Transportation Capacity IncreaseSegment B - - - (SegmentB) Aand Raised Roadway Hybrid Causeway Berm Item 8 11 11 Original Corridor Recommendations : Near-Term, Low-Cost, High-Impact OperationalItem 8 Improvements And Flood Protection Improvements • Total Project Costs (Entire Corridor): $40M – $50M • Project Delivery: 1 – 7 Years 2-Lane Rural Highway 1,700 Typical Capacity 1,600 Lost Operational = 300 Efficiency 1,300 Existing Seg. B Capacity 1,200

12 Note: Vehicles Per Hour 12 Original Corridor Recommendations: Mid to Long-Term ImprovementsItem 8

• Total Project Cost (Entire Corridor): $1,500M – $4,500M • Project Delivery: Between 10 – 20+ Years

1313 Segment B is the Priority Segment Item 8

Segment Risk Rating Segment A Segment B Segment C Effect on Existing Traffic Congestion 1 3 1 Effects on Environmental Resources 2 3 1 Impacts Due to Sea Level Rise 3 3 1 Economic Impact on Commuters 3 3 3 Economic Impact on Goods Movement 2 3 3 Impacts to Recreational Activities 2 3 2 Length of Segment Impacted/Capital Improvement Cost 3 3 1

Composite Risk Rating 2 3 2 Note: Risk ratings were assigned as follows: 1.0 - 1.4 (low), 1.5 - 2.4 (moderate), and a 2.5 - 3.0 (high) 1414 Integrated Ecosystem Design Item 8

Vision and Guiding Principles of Baylands Group added to Corridor Plan: Integrate, Don’t Mitigate: Integrate infrastructure improvements for SR 37 with existing and future habitat planning, conservation and restoration to ensure healthy ecosystem function and resilience to landscape scale change of the San Pablo Bay.

Image: USFWS San Pablo Bay National Wildlife Refuge 1515 Priority Segment B ‘Ultimate’ Design Considerations: HybridItem 8

Causeway * Hybrid project design Existing restored wetland The causeway would create wetland Embankment restoration opportunities, by reconnecting the Remove existing hydrologic and embankment ecological landscape, and reconfigure tidal exchange.

The levee/ embankment would Widen existing provides an option as embankment a living levee, improve access to public viewing areas. * Box culvert is also an option. 1616 Note that this is an illustrative restoration scenario, not a proposed plan. Segment B Design Considerations – Cross Section Item 8 • Deliver Between 10 – 20+ Years • Construction Cost Range: $1,030M – $2,650M • New Lane(s) be HOV/Managed Lanes

• Bay Trail/Bike Facility Options

Existing Segment B 3-Lane Segment B – Contra-Flow Lane with Movable Barriers • Footprint Consideration: Environmental, Future CV/AV Impacts on Roadbed Use and Lane Widths 4-Lane Segment B 1717 Note: High-level cost estimates, subject to further refinement. Latest Recommendation: Segment B ‘Congestion Relief’ ProjectItem 8

Image: USFWS San Pablo Bay National Wildlife Refuge 1818 Public Outreach Item 8

Input received from:

• Four Open Houses on Draft Corridor Plan: Sept. – Oct 2017

• Online Place based survey with approximately 3700 responses: Dec. – Jan. 2018

• Focus Groups: Jan – Feb & May – June 2018

• Environmental Stake Holder Working Group Meetings.

• Policy Committee Meetings since November 2015

1919 Findings From Focus Groups Item 8 Thoughts on the Whole Corridor

Thoughts on Project Alternatives

Image: USFWS San Pablo Bay National Wildlife Refuge 2020 Item 8 TAM Segment ‘A’ Study Road Design Criteria

• Re-establish connectivity and allow for future restoration • Design to latest Year 2100 Sea Level Rise (SLR) projection • Provide a four-lane conventional highway facility including a multi-use path

21 SRItem 121 8

US 101

Subtidal Channel and Shallow Bay Mudflat Tidal Marsh

Photo: Google Earth22 Water Surface Elevations Item 8

Design Water SurfaceElevation Existing Roadway Elevation 21.8 ft NAVD Freeboard 2.0 ft 19.8 ft NAVD 1:100 yr Waves 3.0 ft 16.8 ft NAVD

2100 Sea Level Rise 6.9 ft

9.9 ft NAVD 1:100 yr Storm 3.6 ft 6.3 ft NAVD 6.0 ft NAVD Novato Creek 4.0 ft NAVD Tide Range 6.2 ft East of Petaluma River 2.0 ft NAVD 23 Item 8 Road Alternatives Analyzed

Alt 1: Piled Causeway Elevate SR 37 on structure $1.8 Billion (2018)

Alt 2: Hybrid – Piled Causeway/Embankment Combination of embankment and structure $1.4 Billion (2018)

Alt 3: Novato Creek Bridge Elevate portion of SR 37 from US 101 to past Novato Creek only $364 Million (2018) 24 Item 8

Alternative 1 – Piled Causeway 25 Item 8 Alt. 1: Typical Section – Piled Causeway

26 Item 8

Alternative 2 – Hybrid (Piled Causeway/Embankment) 27 Item 8 Alt. 2 – Hybrid Typical Embankment Section

28 MTC Originally Proposed Implementation Timeline Item 8

2929 Next Steps Item 8 • Developing Preliminary Design for Priority Segment B: . “Phase 1 - Interim” 3-Lane and 4-Lane Options Managed Lane alternatives to include Near-Term Operational Improvements at SR 121 (Sonoma Co), Mare Island and Fairgrounds Drive (Solano Co) . “Phase 2 – Ultimate” Hybrid Roadbed Design Option: Causeway/Box Culvert/Levee

• MTC and Solano TA (STA) - preparing a Caltrans Project Study Report by the end of 2018 in order to begin Environmental Clearance

• Evaluating Transit Options for the Corridor

• MTC and STA intend to environmentally clear and develop 2 projects in Segment B concurrently: Interim and Ultimate

• MTC continues Environmental Stakeholder Outreach, including Resource Agencies

• TAM to conduct preliminary levee study with Marin County Public Works on Segment A in Fall 2018

• Recommendation to Board: (a) Request SR37 Policy Committee’s support to fund Comprehensive Levee Study Plan of Seg. A and environmentally clear project ($15-18 Mil), and (b) plan long-term improvements as an Entire Corridor incl. environmental review as premised under Regional Measure 3. 3030 Questions Item 8

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