Evolving Shorelines Project at Bothin Marsh

Status Planning County Marin
Project Type Non-mitigation Location 37.88570° N, -122.52226° W Map
Project Area (Acres) No Data Last Updated 16 January 2024
Project Abstract The Project would incorporate nature-based strategies to remove impediments to the evolution and restoration of tidal wetlands and restore ecological processes and habitat function at Bothin Marsh. This Project would also redesign the Preserve’s trail system to ensure year-round active transportation and recreational access along the shoreline.
Project Groups San Francisco Bay Adaptation | San Francisco Bay Joint Venture | San Francisco Bay Restoration Authority (Eligible) | San Francisco Bay Restoration Authority (Funded)
Administrative Region San Francisco Bay Joint Venture - Jemma Williams, SFBJV

Project Identification

IDType
No Data

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Bothin Marsh Open Space Preserve Conceptual design Enhancement Bay Habitat (SFBJV Only) Tidal marsh 76.00 Planning completed Fully tidal
Bothin Marsh Open Space Preserve Feasibility study Enhancement Creek-to-Baylands Reconnection, Ecotone Levees, Infrastructure, Sediment Management, Vegetation Management, Wildlife-specific Measures Bay Habitat (SFBJV Only) Tidal marsh 76.00 Planning in-progress Fully tidal

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data

Sites

NameStatusAcres
Bothin Marsh Open Space Preserve Planning/Scoping 152.0

Events

DateTypeDescriptionSite Name
2022-10-31 Other Geotechnical Investigation. In October 2022 subsurface geotechnical information collection will be conducted at Bothin Marsh Open Space Preserve. Seven cone penetration tests and four shallow borings will inform design for the future potential Bothin Marsh Evolving Shorelines Project.
2020-10-15 Update Community Presentation of Conceptual Design Options: https://us02web.zoom.us/rec/play/q5WMd6OE5HG52nYOPI94LcIf5XUx7VQ3ir7QVNAA-6JZ-qZeEXXFb9Xe1NBIe5tn5uFwbYPptdrdAUz-.mItHu-M98XoyFKn1?continueMode=true&_x_zm_rtaid=aHm83kr3Q-6FMoQAmNZZPQ.1621371366133.57c067c0fb3b794fc477b4f5764281a7&_x_zm_rhtaid=749
2020-06-22 Report Initial Planning Memo https://www.onetam.org/sites/default/files/pdfs/bothin%20vision%20doc.pdf
2019-10-01 Report Project Vision Document https://www.onetam.org/sites/default/files/pdfs/Evolving%20Shorelines_VisionForTheFuture_BothinMarsh_FINAL_WEB.pdf
2018-01-01 Report Conservation Options Report https://www.onetam.org/sites/default/files/pdfs/BothinMarshGeomorphologyEcologyandConservationOptions.pdf

People

TypeNameOrganizationDepartment
Agency Staff Veronica Corella Pearson Marin County Parks and Open Space Marin County Open Space District
Contractor Environmental Science Associates Not applicable/Unknown
Partner Marilyn Latta State Coastal Conservancy Not applicable/Unknown
Partner Robert LaPorte Golden Gate National Parks Conservancy Not applicable/Unknown

Funding

Funding Need: $1,500,000

PhaseActivityFunderAmount
Feasibility study Enhancement SFBRA San Francisco Bay Restoration Authority - Measure AA $255,000
Conceptual design Enhancement Marin Community Foundation $200,000
Conceptual design Enhancement Marin County Measure A $150,000
Feasibility study Enhancement Marin County Measure A $75,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
2008-03-12 5.0.1 Richardson Bay Bridge Marsh #2 estuarine perennial saline 67

Performance Measures

Plan NamePlan GoalPerformance MeasureMeasure ValueStatusEvaluation Date
San Francisco Bay Restoration Authority Community Engagement Benefits economically disadvantaged communities 0 yes measure achieved
San Francisco Bay Restoration Authority Community Engagement Has significant youth involvement component 0 yes measure achieved
San Francisco Bay Restoration Authority Community Engagement Number of unique volunteers expected to participate 0 count measure achieved
San Francisco Bay Restoration Authority Community Engagement Number of volunteer hours expected to be contributed 0 count measure achieved
San Francisco Bay Restoration Authority Community Engagement Number of youth participants expected to be engaged 0 count measure achieved
San Francisco Bay Restoration Authority Flood Protection Miles of levee to be constructed 0 miles measure achieved
San Francisco Bay Restoration Authority Public Access Miles of Bay Trail to be constructed 0 miles measure achieved
San Francisco Bay Restoration Authority Public Access Number of public access facilities to be constructed 0 count measure achieved
Name File Type Submitted On Submitted By
Geotech - SFBRWQCB Permit Plan Or Permit 2023-01-03 Jemma Williams, San Francisco Bay Joint Venture
SFBRA Staff Recommendation Other 2022-01-13 Jemma Williams, San Francisco Bay Joint Venture

How to Use the Habitat Development Curve

Habitat Development Curves (HDCs) are used to determine the developmental status and trajectory of on-the-ground projects to create, restore, or enhance California wetland and stream habitats. Each HDC is based on assessments of habitat condition for different age areas of one habitat type that in aggregate represent the full spectrum of habitat development. The assessments of condition are provided by expert applications of the California Rapid Assessment Method (CRAM). Visit the CRAM website for more information about CRAM.

For each HDC, reference condition is represented by areas of a habitat that consistently get very high CRAM scores, have not been subject to disruptive management practices, and exist within landscapes that are protected and managed for their natural conditions. The horizontal lines intersecting the top of an HDC represent the mean CRAM score and standard deviation of scores for 25 qualifying reference areas.

The age of a project is estimated as the elapsed time in years between the groundwork end date for the project and the date of the CRAM assessment. To add or update a groundwork end date, use the Project Events form in Project Tracker (ptrack.ecoatlas.org). The minimum age in years of a non-project area, including any natural reference area, is estimated from all available local information, including historical maps and imagery, historical written accounts, and place-specific scientific studies of habitat development.

An HDC can be used to address the following questions:

  1. At what time in the future will the area of assessed habitat achieve the reference condition or other milestones in habitat development? The HDC can answer this question if the CRAM score for the assessed area is within the confidence interval of the HDC. The answer is the time in years along the HDC between the current age of the assessed area and the future date corresponding to the intersection of the HDC and the reference condition or other milestone.
  2. Is the area of assessed habitat likely to develop faster, slower, or at the same pace as most other areas of the same habitat type? The habitat area is likely to develop faster, slower, or at the same pace if the CRAM score for the area is above, below, or within the confidence interval of the HDC, respectively.
  3. What can be done to improve the condition of the habitat area or to increase its rate of development? HDCs by themselves cannot answer this question. Possible answers can be inferred by the following analysis that involves HDCs:
    1. Examine the HDC for each of the four CRAM Attributes;
    2. Identify the Attribute(s) scoring below the HDC;
    3. For any low-scoring Attribute, examine the component Metric Scores (note: the Metric Scores for any public CRAM assessment in the CRAM database can be obtained through EcoAtlas);
    4. Assume the low score of an Attribute is due to its low-scoring Metric(s);
    5. Consider modifying the design or management of the habitat area in ways that will sustainably increase its score(s) for the low-scoring Metric(s).

For more information about CRAM Attributes and Metrics, including their scientific rationale, see the CRAM Manual.

Display Habitat Development Curves For Wetland Type:

CRAM Site Scores