sr 37–segment a - california
TRANSCRIPT
![Page 1: SR 37–Segment A - California](https://reader033.vdocuments.mx/reader033/viewer/2022061607/62a0131fe589872c761fd776/html5/thumbnails/1.jpg)
SR 37–Segment Afrom US 101 to Sears Point
Sea Level RiseCorridor Improvement Study
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Significant Study Effort Completed to DateState Route 37 Integrated Traffic Infrastructure and Sea Level Rise Analysis: Final Report – October 02, 2015UC Davies Study & AECOM engaged by Caltrans
Novato Creek Baylands – Historical Ecology Study, May 2015SFEI Aquatic Science Center
SR 37 Transportation and Sea Level Rise Corridor Improvement Plan September 2017Kimley Horn & AECOM engaged by MTC
San Pablo Baylands: Ensuring a Resilient Shoreline-October 2017State Route 37 – Baylands Group
California Highway 37 Bridge Configuration at Novato Creek for Future Sea Level Rise – January 2018Marin County Flood Control District, Schaaf & Wheeler
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SR 37 - Segment A A Deeper LookGoals• Gather information from key stakeholders,
interest groups and landowners
• Integrated approach to optimize hydrologic and wildlife restoration, commuters and provide bicycle pedestrian connectivity and future access Develop Study Design Criteria
Targeted Scope • Short study period – less than 3 months
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Stakeholder and Interest Groups Integrated in the Study
• Marin County• Sonoma County Transportation Authority• SMART• Caltrans• City of Novato• US Fish and Wild Life• Sonoma Land Trust• UC Davis• Ducks Unlimited• Marin Audubon Society• Coastal Conservancy
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Study Assumptions
• Maintain local access for key local roads as well as the Bay Trail
• Conceptual evaluation of US 101/SR 37 interchange for Sea Level Rise
• Conceptual review of transit • Construction staging concepts
were not developed
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Study Design Criteria
• Re-establish connectivity and allow for future restoration
• Design to latest Sea Level Rise (SLR) projection
• Provide a four-lane conventional highway facility including a multi-use path
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US Coast Survey, 1856
LakevilleHighway
SR 121
PetalumaRiver
SonomaCreek
San Pablo Bay
Historical Landscape – Sears Point, 1856
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Subtidal Channeland Shallow BayMudflat
Tidal Marsh
Photo: Google Earth
US 101
SR 121
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US 101
SR 121
UC Davis AECOM 2015
Low areas vulnerable to flooding.
Levees vulnerable to overtopping or failure.
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Water Surface Elevations
Tide Range 6.2 ft
6.3 ft NAVD1:100 yr Storm 3.6 ft
9.9 ft NAVD
2100 Sea Level Rise 6.9 ft
16.8 ft NAVD1:100 yr Waves 3.0 ft
19.8 ft NAVD Freeboard 2.0 ft21.8 ft NAVD
East of Petaluma RiverNovato Creek
2.0 ft NAVD4.0 ft NAVD6.0 ft NAVD
Existing Roadway ElevationDesign Water SurfaceElevation
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Width of channel atPetaluma
River Bridge
Historical - 1250 ft
Current - 755 ft
Future (max) - 1500 ftPhoto: Google Earth
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Alternatives Analyzed
Alt 1: Piled Causeway Elevate SR 37 on structure
Alt 2: Hybrid – Piled Causeway/Embankment Combination of embankment and structure
Alt 3: Novato Creek Elevate portion of SR 37 from US 101 to past Novato Creek only
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Alternative 1 – Piled Causeway
• 5.8 miles of Piled Causeway/Bridge
Marin/Sonoma County Line
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Typical Section – Piled Causeway
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Alternative 1 – Piled Causeway
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Alternative 2 - Hybrid (Piled Causeway/Embankment)
• 3.2 miles of Piled Causeway/Bridge• 2.6 miles of Embankment
Marin/Sonoma County Line
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Alternative 2 - Typical Embankment Section
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Alternative 2 - Hybrid (Piled Causeway/Embankment) at Lakeville Rd
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Alt1&2 - Petaluma River Bridge Replacement
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Alternative 3 – US 101 to Novato Creek
• 1.0 mile of Structure
Marin/Sonoma County Line
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Typical Section – Piled Causeway
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Conclusion• Segment A is vulnerable to flooding under existing conditions
• Two locations of particular concern for overtopping• Port Sonoma• Novato Creek
• Majority of the levees are in poor conditions
• A long term solution is needed now for specific project identificationand environmental clearance.
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Thank You
Questions?