Tolay Creek Restoration

Status Completed County Sonoma
Project Type Non-mitigation Location 38.14107° N, -122.43939° W Map
Project Area (Acres) 435.0 Last Updated 2 July 2018
Project Abstract The Tolay Creek Restoration Project restored tidal marsh habitat by increasing tidal flow to 435 acres of the channelized lower Tolay Creek. This project improved habitat for endemic tidal marsh species.

Project Identification

249 JV - Record Number

Habitat Plan

ActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Restoration (unspecified) Unspecified Bay Habitat (SFBJV Only) Tidal marsh 435.0 Completed Fully tidal

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data


Tolay Creek Completed 435.0


DateTypeDescriptionSite Name
2002-10-01 Project end date
1997-01-01 Project start date


Contact Don Brubaker USFWS - San Francisco Bay National Wildlife Refuge Complex San Pablo Bay
Contact Meg Marriott USFWS - San Francisco Bay National Wildlife Refuge Complex San Pablo Bay
Contact Unknown California Department of Water Resources Not applicable/Unknown
Contact Renee Spenst Ducks Unlimited, Inc. Not applicable/Unknown


Restoration (unspecified) Marin-Sonoma Mosquito and Vector Control District
Restoration (unspecified) CalFed (historic funding program) $283,000
Restoration (unspecified) Shell Oil Company Mitigation Fund $190,000
Restoration (unspecified) U.S. Environmental Protection Agency $39,000
Restoration (unspecified) SCC State Coastal Conservancy $24,000
Restoration (unspecified) Sonoma County Fish and Wildlife Board $5,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

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