Evolving Shorelines Project at Bothin Marsh
|Project Type||Non-mitigation||Location||37.88570° N, -122.52226° W Map|
|Project Area (Acres)||No Data||Last Updated||19 September 2022|
|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 Restoration Authority (Eligible) | San Francisco Bay Restoration Authority (Funded)|
|Administrative Region||San Francisco Bay Joint Venture - Sandra Scoggin, SFBJV|
|Site Name||Phase||Activity||SubActivities||Habitat||SubHabitat||Acres||Activity Status||Water 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, Wildlife-specific Measures||Bay Habitat (SFBJV Only)||Tidal marsh||76.00||Planning in-progress||Fully tidal|
|Habitat||Acres Lost||Type of Loss|
|Bothin Marsh Open Space Preserve||Planning/Scoping||152.0|
|Partner||Robert LaPorte||Golden Gate National Parks Conservancy||Not applicable/Unknown|
|Agency Staff||Veronica Corella Pearson||Marin County Parks and Open Space||Marin County Open Space District|
|Partner||Marilyn Latta||State Coastal Conservancy||Not applicable/Unknown|
|Contractor||Unknown||Environmental Science Associates||Not applicable/Unknown|
Funding Need: $1,500,000
|Feasibility study||Enhancement||SFBRA San Francisco Bay Restoration Authtority - 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|
|Visit Date||Version||Site Name||Wetland Type||Index Score|
|2008-03-12||5.0.1||Richardson Bay Bridge Marsh #2||estuarine perennial saline||67|
|Plan Name||Plan Goal||Performance Measure||Measure Value||Status||Evaluation Date|
|San Francisco Bay Restoration Authority||Community Engagement||Benefits economically disadvantaged communities||measure achieved|
|San Francisco Bay Restoration Authority||Community Engagement||Has significant youth involvement component||measure achieved|
|San Francisco Bay Restoration Authority||Community Engagement||Number of unique volunteers expected to participate||measure achieved|
|San Francisco Bay Restoration Authority||Community Engagement||Number of volunteer hours expected to be contributed||measure achieved|
|San Francisco Bay Restoration Authority||Community Engagement||Number of youth participants expected to be engaged||measure achieved|
|San Francisco Bay Restoration Authority||Flood Protection||Miles of levee to be constructed||measure achieved|
|San Francisco Bay Restoration Authority||Public Access||Miles of Bay Trail to be constructed||measure achieved|
|San Francisco Bay Restoration Authority||Public Access||Number of public access facilities to be constructed||measure achieved|
|Name||File Type||Submitted On||Submitted By|
|SFBRA Staff Recommendation||Other||2022-01-13||Rob LaPorte, Golden Gate National Parks Conservancy|
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:
- 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.
- 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.
- 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:
- Examine the HDC for each of the four CRAM Attributes;
- Identify the Attribute(s) scoring below the HDC;
- 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);
- Assume the low score of an Attribute is due to its low-scoring Metric(s);
- 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.