“Richardson Bay” by eeetthaannn is licensed under CC by 2.0 Local Assessments Section A: RICHARDSON Operational Landscape Unit JURISDICTIONS WITHIN THIS SECTION Marin County Tiburon Mill Valley Belvedere Sausalito Alto Marin City Strawberry Tamalpais-Homestead Valley HOW TO USE THE LOCAL ASSESSMENTS WHO IS THIS Local jurisdictions Stakeholder Groups General Public FOR? • Cities • Non-profits/NGOs • Residents • Counties • For-profits/Private Anyone interested in State/Regional understanding their local • Special Districts • Associations • Caltrans shared vulnerabilities to • Utilities Providers • Interested Parties flooding and sea level rise. • MTC/ABAG HOW IS IT ORGANIZED? Local assessments are organized by four regional systems assessed: Transportation, Vulnerable Communities, Priority Development Areas (PDAs), and Priority Conservation Areas (PCAs). Each part of the local assessment provides varying levels of details at three scales: 1) Operational Landscape Unit (OLU), 2) Individual Descriptions, and 3) Shared Stories of Vulnerabilities in Focus Areas/Areas of Impact. This assessment can be reviewed in whole, or individual parts can be reviewed separately depending on interest and level of detail desired. WHAT’S IN THIS ASSESSMENT? WHERE ARE WE IN THE REGION? �������������������������������������������������������������������������������� 3 WHAT REGIONAL SYSTEMS ARE HERE? ���������������������������������������������������������������������� 5 WHAT WAS ASSESSED? �������������������������������������������������������������������������������������������� 6 Transportation .......................................................................................................6 Vulnerable Communities ........................................................................................8 Priority Development Areas (PDAs) ......................................................................12 Priority Conservation Areas (PCAs) ......................................................................14 FOCUS AREAS AND AREAS OF IMPACT OLU: RICHARDSON OLU: Focus Area A: Manzanita, Marin City & Waldo .......................................................18 ENDNOTES ������������������������������������������������������������������������������������������������������������29 LOCAL ASSESSMENT LOCAL A - 2 • ADAPTING TO RISING TIDES: BAY AREA Where are we in the region? The Richardson OLU encompasses the entire Richardson Bay in Marin County, ranging from just north of the Golden Gate Bridge on the Southern end to the tip of the Tiburon Peninsula on the northern end. It includes multiple cities on the shoreline, including Tiburon, Mill Valley, Belvedere, and Sausalito, and unincorporated communities including Marin City and Strawberry, as well as several harbors and marinas. Flooding effects from sea level rise occur early and threaten residents as well as the US-101, which is the only land-based transportation route to the North Bay and south towards San Francisco, and SR-1/Shoreline Highway, which is the singular access for Tamalpais Valley and the Marin Parklands, which includes Muir Woods, Stinson Beach and Mt. Tamalpais State Park. Frontline economically challenged communities located here include Marin City, the Gates Co-op Houseboat Community in Sausalito, and boat residents anchored out in Richardson Bay. Approximate area of the OLU. Photo map data: Google, TerraMetrics, CSUMB SFML, CA OPC. TerraMetrics, map data: Google, Photo of the OLU. area Approximate OLU: RICHARDSON OLU: LOCAL ASSESSMENT LOCAL A - 3 • ADAPTING TO RISING TIDES: BAY AREA FOCUS AREA A: Manzanita, Marin City, and Waldo OLU: RICHARDSON OLU: LOCAL ASSESSMENT LOCAL A - 4 • ADAPTING TO RISING TIDES: BAY AREA What regional systems are here? Operational Landscape Unit (OLU) boundaries were used to organize and ART Bay AreaARThelp identifyColor Bay regionallyART Palette Area significant Bay Colorassets Area that were PaletteColor co-located together Palette (Methodology can be found in Section 3.0 Local Assessments). ART website colors Flood mapART colors website colorsART websiteFlood colors map colorsFlood mapART colors Bay Area BannerART Bay Area Banner ARTThe Bay map in AreaFigure 1a showsColor the ARTentire Palette Bay OLU, Area Bannerincluding all the regional systems present.ART Colors website are colors used throughoutFlood map colors this documentART Bay Areato help Banner navigate across these four regional systems. Individual assets that were assessed as part of this local vulnerability assessment are listed in the bullets below and can also be found on the labels on the map. ART Report Color ART ReportFigure Color 1a.ART MAP Report OF Color REGIONAL SYSTEMS AND LIST OF Option #1 ART ReportOption Color #1 Option #1 Option #1 INDIVIDUAL ASSETS ASSESSED WITHIN BELOW: (Passes accessibilityD75627(Passes 71759A for accessibility 21A2B2 47A374 for D75627 71759AD75627 21A2B2 71759A 47A374 21A2B2 47A374 (Passes accessibility for(Passes accessibility for D75627 71759A 21A2B2 47A374 graphical objects interfacegraphical graphicalobjects interface objects graphical interface objects interface components and as back-componentscomponents and as back- andcomponents as back- and as back- ground color with whiteground text) colorground with whitecolor text)withground white color text) with white text) Richmond Richmond Richmond Richmond I-580 I-580 I-580 I-580 I-80 SF WaterI-80 I-80 I-80 Trail Local PCA Roads SF Water SF Water SF Water SF Bay Union Trail Local Trail Trail Local Local Trail PCA Roads Roads PCA PCA Roads PCA Railroad SF Bay South Union RichmSFon dBay Regional Burlington-SF BayUnion Union Northern Richmond Trail Port of Trail Gaps Trail TRANSPORTATITrail ON VULNERABLE PRIORITYSanta Fe PRIORITY PCA PDA Railroad RailroadPCA Richmond PCA RailroadPCA Railroad Railroad COMMUNITIES South Burlington-DEVELOPMENTRichmSouthond RegionalRichCONSERVATIONm onBurlington-d Regional Burlington- • US-101 South Richmon12”d 24” Regional36” 48” 52” 66” 77” Northern Northern RichmondPort of Trail Gaps NorthernPort of Trail Gaps Richmond Port of Trail GapsRichm ond Santa Fe Santa Fe • SR-1 TOTAL SantaWATERAREAS Fe LEVEL (inches) Railroad(PDAs)PDA Richmond PCARailroadAREASRichm (PCAs)ond PCA PDA • MarinRailroad CityRichmon d PCA PDA Railroad Railroad Railroad • Sausalito Ferry Community • Unincorporated • San Francisco Bay 12” 24” 36” 48” 52” 12” 66” 24” 77” 36” 12” 48” 24” 52” 36” 66” 48” 77”52” 66” 77” ART ReportTerminal Color Marin County PDA Trail PCA TOTAL WATER LEVEL (inches) TOTAL WATER LEVEL (inches)TOTAL WATER LEVEL (inches) Option #2• Manzanita Park & • San Francisco Water Ride Trail PCA ART Report Color (Option #1ART is my Report favorite Color butART our team Report also Colorliked the pink too. • Local Roads • Bothin Waterfront Could be Optionanother option #2 for Optionseeing how #2 VC hash layer displays. Option #2 PCA OLU: RICHARDSON OLU: (Option #1 is my favoriteART but Potential our(Option team Design also#1 is liked myElements/(Option favorite the pink or #1 but Potential too. is ourmy favoriteteam Accent also butColors liked our theteam pink also too. liked the pink too. Could be another option for seeingCould how be anotherVC hashCould optionlayer be displays. foranother seeing option how VC for hash seeing layer how displays. VC hash layer displays. ART Potential Design Elements/ART or Potential Potential DesignART Accent Potential Elements/ Colors Design or Potential Elements/ Accent or Potential Colors Accent Colors LOCAL ASSESSMENT LOCAL A - 5 • ADAPTING TO RISING TIDES: BAY AREA What was assessed? TRANSPORTATION Richardson Bay Bridge and US-101. Photo map data: Google Bridge and US-101. Photo Bay Richardson US-101 • US-101 is the primary north-south transportation artery through the Marin and Sonoma Counties and provides access to the North Bay and East Bay via SR-37 and I-580. It provides important commuter transportation service for local, regional, and inter-regional automobile and truck traffic, averaging 131,500 vehicles1 and 2,579 trucks2 per day. It is also a designated emergency route for the Bay Area3. Within this OLU, US-101 is an 8-lane highway in the western section of TRANSPORTATION the OLU between Marin City in the South and Greenbrae in the north. It is the only major roadway in and out of this OLU. The ramp near Bridgeway is first exposed at 36” TWL, with significant flooding impacts at 48” TWL, when flooding impacts the other access roads and Donahue St and Drake Ave leading into Marin City. SR-1 • SR-1 provides access to west Marin, including National Parks. There are OLU: OLU: RICHARDSON limited roadways connecting West and East Marin, and the next westbound connecting road is at Sir Francis Drake Blvd in San Rafael. It averages 33,000 vehicles per day.4 Within this OLU, it is first exposed at 12” TWL at the junction with US-101. LOCAL ASSESSMENT LOCAL A - 6 • ADAPTING TO RISING TIDES: BAY AREA Manzanita Park & Ride • Located beneath the US-101 in Manzanita, the Manzanita Park & Ride is a key local hub for accessing Golden Gate Transit, Marin Airporter and “tech business” commute buses, regionally significant Muir Woods Shuttle run by Marin Transit, and carpools, which use the US-101. It already frequently floods due to rainfall and King Tides. It would become permanently inundated as early as 12” TWL. Sausalito Ferry Terminal • Shared by Golden Gate Ferry and Blue and Gold Fleet and owned and maintained by the City of Sausalito, this terminal has an average annual ridership of roughly 800,000 (2015-2017).5 This is the fourth highest