Drakes Estero Restoration

Status Completed County Marin
Project Type Non-mitigation Location 38.05914° N, -122.93871° W Map
Project Area (Acres) 1,815 Last Updated 18 September 2021
Project Abstract This project removed 5 miles (500 tons) of wooden oyster racks and 1 acre of aquaculture debris from Drakes Estero to restore eelgrass habitat and remove unnatural habitat for non-native species. Monitoring will continue for the next several years.
Project Groups San Francisco Bay Joint Venture
Administrative Region San Francisco Bay Joint Venture - Jemma Williams, SFBJV

Project Identification

IDType
No Data

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Drakes Estero None Monitoring & Evaluation Vegetation Management Subtidal Habitat Submerged aquatic vegetation 1,815 Implementation in-progress Fully tidal
Drakes Estero None Restoration (unspecified) Vegetation Management, Wildlife-specific Measures Subtidal Habitat Submerged aquatic vegetation 1,815 Completed Fully tidal

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data

Sites

NameStatusAcres
Drakes Estero Completed 1,815

Events

DateTypeDescriptionSite Name
2017-04-15 Project end date Offshore work completed.
2016-08-01 Project start date Offshore clean-up and restoration begins.

People

TypeNameOrganizationDepartment
Contact Brannon Ketcham USNPS U.S. National Park Service Not applicable/Unknown
Contact Ben Becker USNPS U.S. National Park Service Not applicable/Unknown

Funding

PhaseActivityFunderAmount
None Restoration (unspecified) National Park Foundation $2,000,000
None Restoration (unspecified) U.S. National Parks Service $2,000,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
2012-11-05 6.0 Schooner Marsh #5 estuarine perennial saline 70
2012-11-05 6.0 Schooner Marsh #2 estuarine perennial saline 72
2012-11-05 6.0 Schooner Marsh #3 estuarine perennial saline 70
2012-11-05 6.0 Schooner Marsh #4 estuarine perennial saline 70
2012-11-05 6.0 Schooner Marsh #1 estuarine perennial saline 74
2011-12-28 5.0.2 Drake's Estero estuarine perennial saline 89
2007-08-21 4.6 Drake's Estero Thumb estuarine perennial saline 68
2007-08-21 4.6 Oyster Farm Drakes estuarine perennial saline 77
Name File Type Submitted On Submitted By
NPS Project Website Other 2017-11-28 Elisabeth Duffy, 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