Petaluma Marsh Expansion and Restoration

Status Completed County Marin
Project Type Compensatory mitigation Location 38.18025° N, -122.57209° W Map
Project Area (Acres) 284.0 Last Updated 23 September 2021
Project Abstract This project is focused on monitoring of existing and restored wetlands habitat in the largest historic wetlands in SF Bay, and enhancement of upland refuge habitat to provide high tide refuge for wildlife and allow for adaptation to sea level rise. The final Monitoring Report was completed in 2017. Transition zone revegetation continues.
Project Groups San Francisco Bay Adaptation | San Francisco Bay Restoration Authority (Eligible)
Administrative Region San Francisco Bay Joint Venture - Sandra Scoggin, SFBJV

Project Identification

M02-21 BCDC - Permit Number
141 JV - Record Number
02-21-C0322 SWRCB - 401 Certification Letter (e.g., Site Number or WDID)
271930 USACE - DA File Number

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Petaluma Marsh Expansion and Restoration None Acquisition/Preservation/Protection Unspecified Bay Habitat (SFBJV Only) Tidal marsh 182.0 Completed Fully tidal
Petaluma Marsh Expansion and Restoration None Monitoring & Evaluation Bay Habitat (SFBJV Only) Tidal marsh 182.0 Completed None
Petaluma Marsh Expansion and Restoration None Restoration (unspecified) Bay Habitat (SFBJV Only) Tidal marsh 102.0 Completed Fully tidal

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data


Petaluma Marsh Expansion and Restoration Construction completed 284.0


DateTypeDescriptionSite Name
2006-01-01 Project end date
2003-12-19 Permit BCDC record number issued.
2003-06-26 Permit USACE Permit issued
2003-06-16 Report Restoration Plan issued.
1996-01-01 Project start date


Contact Barbara Salzman Marin Audubon Society Not applicable/Unknown
Partner Maria Lafer San Francisco Bay Regional Water Quality Control Board Not applicable/Unknown


Funding Need: $60,000

None Restoration (unspecified) SCC State Coastal Conservancy $1,874,000
None Acquisition/Preservation/Protection CDOT California Department of Transportation $350,000
None Acquisition/Preservation/Protection CalFed (historic funding program) $278,306
None Monitoring & Evaluation CDFW Ecosystem Restoration Program $225,329
None Restoration (unspecified) USFWS Coastal Program at San Francisco Bay $25,000
None Monitoring & Evaluation Marin Community Foundation $15,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Criteria

StatusDetailsEvaluation Date
Unknown/Unspecified See additional sheets taken from "Mitigation and Monitoring Plan Petaluma Marsh Expansion Project" dated June 16, 2003 and prepared by Philip Williams and Associates, LTD, Consultants in Hydrology. 2020-01-01

No files found.

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 ( 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