D. Suisun Slough
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Suisun Marsh. Photo by BCDC. Local Assessments Section D: SUISUN SLOUGH Operational Landscape Unit JURISDICTIONS WITHIN THIS SECTION Solano County Suisun City Fairfield 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 asessment 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: SUISUN SLOUGH OLU: Focus Area A: Suisun City and South Fairfield ........................................................ 16 Area of Impact B: I-680 at Oakridge Lane ............................................................... 28 Area of Impact C: Suisun Marsh and Grizzly Island Road.........................................36 ENDNOTES ��������������������������������������������������������������������������������������������������������� 44 LOCAL ASSESSMENT LOCAL D - 2 • ADAPTING TO RISING TIDES: BAY AREA Where are we in the region? This OLU encompasses the central section of southern Solano County from I-680 in the west, SR-12 in the north, and Montezuma Slough in the east. This includes Suisun City, parts of Fairfield, parts of Benicia, parts of unincorporated Solano County, and much of the Suisun Marsh. The Suisun Marsh is the largest contiguous brackish (a mixture of fresh and sea water) wetland in the western United States. The lands and waters of this unique ecosystem also are home to a wide variety of plants, fish and wildlife that depend upon a careful balancing of fresh and saline waters for their survival. It is also an important stop on the Pacific Flyway, a major bird migratory route extending from Alaska to Patagonia, providing food and habitat for migratory birds.1 This OLU also includes large swaths of wetland surrounding Grizzly Bay including parts of the San Francisco Bay National Estuarine Research Reserve, Grizzly Island Wildlife Area (California Department of Fish and Wildlife), Rush Ranch Open Space (Solano Land Trust), Peytonia Slough Ecological Reserve (CDFW), and Hill Slough Wildlife Area (CDFW). Most of the land in the OLU are managed wetlands that support duck hunting activities. Other land uses within the OLU include high, medium, and low intensity development, cultivated crops, and grazing. Approximate area of the suisun Slough OLU. of the suisun Slough OLU. area Approximate Map data © 2019 by Google & Image Landsat/Copernicus. Map data © 2019 by OLU: SUISUN SLOUGH OLU: LOCAL ASSESSMENT LOCAL D - 3 • ADAPTING TO RISING TIDES: BAY AREA AREA OF IMPACT C: Suisun Marsh and Grizzly Island Road FOCUS AREA A: Suisun City/South Fairfield AREA OF IMPACT B: OLU: SUISUN SLOUGH OLU: I-680 at Oakridge Lane LOCAL ASSESSMENT LOCAL D - 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). Flood map colors ART website colors Flood mapART colors website colorsART websiteFlood colors map colors ART Bay Area BannerART Bay Area Banner ARTThe Bay map on Area page 4 shows Color the entireART Palette Bay OLU, Area including Banner 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 (Figure 1d). ART Report ColorART Report Color ART Report Color Figure 1d. MAP OF 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 objectsgraphical interface objects interface graphical objects interfacegraphical 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 colortext) with white text) Richmond Richmond Richmond Richmond I-580 I-580 I-580 I-580 I-80 I-80 I-80 SF WaterI-80 Trail Local PCA Roads SF Water SF Water SF Water SF Bay Trail Union Trail Local Local Trail Local Trail PCA PCA Roads Roads PCA PCA Roads Railroad SF Bay SF BayUnion Union SF Bay South Union Richmond Regional Burlington- Trail NorthernTrail Trail Richmond Port of Trail Gaps TRANSPORTATION VULNERABLE PCA PRIORITYSantaPCA Fe Railroad PRIORITYRailroad PCA PDA Railroad Railroad Richmond PCA Railroad RichmonBurlington-d Regional Burlington- COMMUNITIES South Burlington-DEVELOPMENTRichmSouthond RegionalCONSERVATION South Richmond Regional 77” Northern Northern 12” 24” 36” Northern48” 52” 66”Ric hmondPort of Trail Gaps Port of Trail Gaps Port of Trail GapsRichm ond Santa Fe Santa Fe Richmond Santa Fe Railroad Richmond PCA TOTALPDA WATERAREAS LEVEL (inches) Railroad(PDAs)PDA Richmond PCA AREASRailroad (PCAs) Railroad PDA Railroad Richmond PCA Railroad • Downtown12” South24” 36”• San48” Francisco 77”52” Bay66” 77” ART Report• I-680 Color 12” 24” • Fairfield36” 48” & Suisun52” 12” 66” 24” 77” 36” 48” 52” 66” Jefferson Street TOTALWater WATER Trail LEVEL PCA(inches) Option #2• SR-12 CityTOTAL Community WATER LEVEL (inches) TOTAL WATER LEVEL (inches) • Union Pacific PDA ART Report Color ART Report Color (Option #1ART Railroadis my Report favorite Color but our team also liked the pink too. Option #2 Could be• Optionanother Amtrak/Capital option #2 for seeingOption how #2 VC hash layer displays. Corridor • Grizzly Island Road SUISUN SLOUGH OLU: (Option #1 is my favoriteART but Potential our(Option team Design also#1 is liked myElements/ (Optionfavorite the pink or #1but Potential too. is our my teamfavorite Accent also Colorsbut liked our the team pink also too. liked the pink too. • Local Roads Could be another option for seeingCould how be anotherVC hashCould optionlayer be displays. for another seeing option how VC for hash seeing layer how displays. VC hash layer displays. ART Potential Design Elements/ART or Potential Potential Design ARTAccent Potential Elements/ Colors Design or Potential Elements/ Accent or Potential Colors Accent Colors LOCAL ASSESSMENT LOCAL D - 5 • ADAPTING TO RISING TIDES: BAY AREA What was assessed? TRANSPORTATION I-680. Map data © 2019 by Google. Map data © 2019 by I-680 • Interstate 680 is a four-lane, north-south highway in the North Bay and East Bay that serves a critical transit connection between southwest Solano County (Fairfield) south through Contra Costa and Alameda Counties inland through the hills and valleys of the California Coast Ranges. I-680 averages 74,500 vehicles2 and 3,927 trucks3 per day. Within this OLU, it is exposed at 36” TWL near Oakridge Lane in Benicia, at which point it is significantly flooded and transit connectivity is TRANSPORTATION impacted. SR-12 • State Route 12 is a four-lane state highway that travels in an east–west direction from Sonoma to Solano counties. Within this OLU, it travels from I-80 through Suisun City and Fairfield before heading towards the Central Valley. It averages 25,500 vehicles4 and 2,464 trucks5 per day. It is a lifeline route, meaning it has been predefined as an emergency route necessary for disaster planning and OLU: SUISUN SLOUGH OLU: economic recovery.6 Flooding on east bound lanes east of Suisun city begins at 52” TWL, and both lanes are flooded at 66” TWL. LOCAL ASSESSMENT LOCAL D - 6 • ADAPTING TO RISING TIDES: BAY AREA Union Pacific Railroad • The Union Pacific Railroad (UPRR) is an important heavy freight rail supporting the reliable movement of goods to markets across the Bay Area. The rail connects many Bay Area ports and connects