Wildcat Creek Restoration Action Plan Version 1.3 April 26, 2010 Prepared by the URBAN CREEKS COUNCIL for the WILDCAT-SAN PABLO WATERSHED COUNCIL
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wildcat creek restoration action plan version 1.3 April 26, 2010 prepared by THE URBAN CREEKS COUNCIL for the WILDCAT-SAN PABLO WATERSHED COUNCIL Adopted by the City of San Pablo on August 3, 2010 wildcat creek restoration action plan table of contents 1. INTRODUCTION 5 1.1 plan obJectives 5 1.2 scope 6 Urban Urban 1.5 Methods 8 1.5 Metadata c 10 reeks 2. WATERSHED OVERVIEW 12 c 2.1 introdUction o 12 U 2.2 watershed land Use ncil 13 2.3 iMpacts of Urbanized watersheds 17 april 2.4 hydrology 19 2.5 sediMent transport 22 2010 2.6 water qUality 24 2.7 habitat 26 2.8 flood ManageMent on lower wildcat creek 29 2.9 coMMUnity 32 3. PROJECT AREA ANALYSIS 37 3.1 overview 37 3.2 flooding 37 3.4 in-streaM conditions 51 3.5 sUMMer fish habitat 53 3.6 bioassessMent 57 4. RECOMMENDED ACTIONS 58 4.1 obJectives, findings and strategies 58 4.2 recoMMended actions according to strategy 61 4.3 streaM restoration recoMMendations by reach 69 4.4 recoMMended actions for phase one reaches 73 t 4.5 phase one flood daMage redUction reach 73 able of 4.6 recoMMended actions for watershed coUncil 74 c ontents version 1.3 april 26, 2010 2 wildcat creek restoration action plan Urban creeks coUncil april 2010 table of contents 3 figUre 1-1: wildcat watershed overview to Point Pinole Regional Shoreline wildcat watershed existing trail wildcat creek highway railroad city of san pablo planned trail other creek arterial road bart Parkway SAN PABLO Richmond BAY Avenue San Pablo Point UP RR San Pablo WEST COUNTY BNSF RR CITY OF LANDFILL NORTH SAN PABLO RICHMOND San Pablo Dam Road CONTRA 2010 april 26, version 1.3 WILDCAT MARSH PHASE I PHASE II reaches reaches COSTA COUNTY ALVARADO PARK watershed Point boundary Molate WILDCAT CANYON 23rd Street REGIONAL CHEVRON RICHMOND PARK MacDonald Avenue RICHMOND-SAN RAFAEL BRIDGE BAY TRAIL RIDGE TRAIL BART BAY AREA RICHMOND GREENWAY WILDCAT CREEK POINT RICHMOND Cutting Boulevard 80 SAN PABLO 580 RESERVOIR MILLER-KNOX EL CERRITO OHLONE GREENWAY REGIONAL San Pablo Avenue to Marin County Parks and Trails BAY TRAIL SHORELINE MARINA Jewel BAY Lake POINT ISABEL REGIONAL RICHMOND SHORELINE TILDEN INNER REGIONAL PARK HARBOR KENSINGTON Lake Anza SAN FRANCISCO Vollmer Peak BAY 1905ʼ ALAMEDA Grizzly Peak COUNTY BERKELEY 1758ʼ sources: Contra Costa County 2009, Association of Bay Area Governments 2009, East Bay Regional Parks District 2009 to Redwood Regional Park wildcat creek restoration action plan 1. introdUction 1.1 PLAN OBJECTIVES figUre 1-2: watershed location The Wildcat Watershed Restoration Napa Action Plan (WRAP) provides information and recommendations Urban to support management decisions for lower Wildcat Creek watershed c reeks in its urban portions within the City San Pablo Suisun Bay of San Pablo (Figure 1-1). c San Rafael o Mt Tamalpais U The Wildcat San Pablo Creeks ncil Mt Diablo Watershed Council began preparing Oakland the WRAP in 2004 to address april San recurring flood damages which PACIFIC Francisco Central OCEAN 2010 can occur in the City of San Pablo Bay and to develop a strategy for flood protection and stormwater South management while protecting and WILDCAT CREEK WATERSHED Bay enhancing the riparian and instream SAN PABLO CREEK WATERSHED BAY AREA WATERSHEDS San Jose habitat and recreational resources. miles The scope is tightly bound to Wildcat 0 10 20 NORTH Creek within the City of San Pablo. The three main objectives of the plan are prioritized as follows: 1. Reduce flood risk based on Wildcat Creek’s 100-year flood flows and improve stormwater management in low-lying neighborhoods. 2. Enhance riparian habitat, specifically focused on resident rainbow trout and the potential restoration of anadramous steelhead migration. 3. Develop recreational resources for the community, specifically a fully connected two-mile Wildcat Creek Trail through the City. These objectives represent on-going efforts by the local community to address critical opportunities and constraints along lower Wildcat Creek. Despite a thirty year history of planning for flood management by all levels of government, the City remains vulnerable to flooding, as witnessed in the recent December 2005 storms. Although neighborhoods have been built in its floodplain, Wildcat Creek remains a introd 1. dominant natural feature cutting through the City’s urban grid, representing a major opportunity to create a refuge for residents and wildlife. Opportunities to enhance U riparian and instream habitat are supported by the creek’s open channel and a thin edge ction of remnant riparian vegetation through most of the City. Urban infrastructure such as 1.1 plan obJectives 4 wildcat creek restoration action plan culverts, encroaching development, altered stream flow and sediment dynamics, and pervasive urban pollutants present entrenched challenges to conservation of riparian wildlife who depend on a well-connected, high-quality creek corridor through the whole watershed. The creek’s linear form connects two major regional destinations: the well-developed park lands of the East Bay hills and the stunning shoreline along San Pablo Bay. The Wildcat Creek corridor presents a well-recognized but unfulfilled opportunity to connect urban neighorhoods to regional destinations, mass transit and employment centers via a greenway, a linear park and trail system, creating much-needed park space within City limits and supporting goals for reduced flood Urban Urban risk and improved habitat. c reeks 1.2 SCOPE While it was the preference of the Watershed Council to address the entire Wildcat c o Creek watershed in this planning effort, the grant program funding the project U ncil constrained the scope to focus analysis and recommendations on Wildcat Creek reaches within the City of San Pablo (Figure 1-3). The plan considers greater april watershed-scale processes for flood and sediment management as described in previously conducted watershed studies, but does not contribute further analysis 2010 or make recommendations at this scale. The plan does address some critical flood and sediment management strategies downstream of City boundaries because of the closely interrelated resource management issues and their effects on flooding within Wildcat Creek’s main stem City limits. channel flows along 13.8 lineal miles and the watershed covers figUre 1-3: MaJor sections of wildcat watershed 11.1 square miles. The creek’s upper nine miles lies within TIDAL FLAT LOWER WATERSHED UPPER WATERSHED Wildcat Marsh Alluvial Plain Wildcat Canyon East Bay Regional Park District land. This upper watershed, characterized by hilly terrain between two ridgelines, is known as Wildcat Canyon. The boundary between the upper and lower watershed falls near highway Interstate 80, where the creek flows out of the 1 mile canyon onto its alluvial plain. Much of the City of San Pablo (shaded in gray) is located in Wildcat Creek’s lower watershed. About 2.2 miles PHASE I PHASE II of Wildcat Creek run through North Richmond City of San Pablo the City. Downstream, in the unincorporated Contra Costa County community of North area of focus Richmond, another 2.5 miles of introd 1. Wildcat Creek’s channel flows into a tidal flat along San Pablo Bay. Starting in 1985, the U.S. U Army Corps of Engineers led ction flood control planning efforts LOWER WATERSHED in two phases: Phase I in North Richmond (constructed) and 1/2 mile Alluvial Plain Phase II in the City of San 1.2 scope 5 Pablo (never implemented). wildcat creek restoration action plan Urban creeks coUncil april 2010 1. introdUction 6 figUre 1-4: wildcat and san pablo creek shared floodplain cope s 1.2 1.2 San Pablo Creek Watershed Boundary san pablo creek PHASE I PHASE II Richmond Parkway Richmond wildcat creek I-80 NORTH CITY OF RICHMOND UP RR SAN PABLO BNSF RR Vale Road Wildcat Creek Watershed Boundary UPPER TIDAL ALLUVIAL PLAIN FLAT WATERSHED sources: Contra Costa County 2009, Federal Emergency Management Agency 2010 FEMA 100-YEAR FLOODPLAIN FEMA 500-YEAR FLOODPLAIN STREAM GAUGE wildcat creek restoration action plan 1.5 METhoDS approach The WRAP continues the tradition of watershed planning with an interdisciplinary and multi-objective approach that applies a watershed perspective on the processes affecting different reaches. It emphasizes the collection and analysis of information to address flood and stormwater management, fish habitat enhancement, recreational opportunities, public access and stream channel restoration. It aims to identify restoration objectives, opportunities and priorities that are compatible with the local Urban environment while reducing flood damage to property owners and residents. It recognizes urban creeks as an important resource for wildlife and people, providing c health benefits, educational opportunities and recreational amenities by restoring reeks natural processes in the urban environment. c o fUnding and proJect ManageMent U ncil The CALFED Watershed Program grant contract which funded the WRAP began in 2004. The Urban Creeks Council, a local non-profit organization and member of the april Watershed Council, served as the fiscal agent and project manager for the WRAP. The Watershed Council provided guidance throughout the planning process and 2010 made key decisions, such as the selection of immediate priority projects, based on information and analysis provided by the WRAP Technical Advisory Committee. table 1-1: wrap technical advisory coMMittee NAME ORGANIZATION ROLE Grant Administration, Josh Bradt URBAN CREEKS COUNCIL Project Coordination, (through 2008) Restoration Implementation Community outreach, Adéle Ho CITY OF SAN PABLO Information Source, Funding EAST BAY REGIONAL Pete Alexander Fish habitat Assessment PARKS DISTRICT Stream Flow and Stormwater Jonathan owens BALANCE HYDROLOGICS System Analysis Geomorphic Assessment Laurel Collins WATERSHED SCIENCES of Channel Conditions WATERWAYS RESTORATION Roger Leventhal Hydraulic Modeling INSTITUTE WATERWAYS RESTORATION Technical Advice, Community Ann Riley INSTITUTE Outreach and Coordination watershed characterization The planning process for the WRAP included a summary and accounting of all watershed-wide reports, data inventories, planning documents, completed and introd 1.