Skaggs Island and Haire Ranch Restoration

Status Completed County Sonoma
Project Type Non-mitigation Location 38.17575° N, -122.39220° W Map
Project Area (Acres) No Data Last Updated 25 June 2020
Project Abstract This project involves the restoration of the 3,300 acre Skaggs Island (a former military base) and the adjacent 1,100 acre Haire Ranch to wetlands to benefit endangered species and other wildlife, and the creation of recreational trails and public access for wildlife viewing.
Project Groups San Francisco Bay Restoration Authority (Eligible) | San Pablo Bayland Collaborative Protection and Restoration (CPR) Project

Project Identification

774 JV - Record Number
210730 USACE - DA File Number

Habitat Plan

ActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Restoration/Rehabilitation Unspecified Depressional Wetland Marsh and unvegetated flats 1,083 Construction completed
Restoration/Rehabilitation Unspecified Depressional Wetland Marsh and unvegetated flats 3,145 Planning/Scoping
Enhancement Water Management Seasonal Wetland Diked wetland No Data Construction planned

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data


Skaggs Island Haire Completed 1,083
Skaggs Island Navy Completed 3,145


DateTypeDescriptionSite Name
2018-01-01 Project end date
2012-07-01 Project start date
2010-01-28 Other Demolition of water tower


Contact Craig Garner Ducks Unlimited, Inc. Not applicable/Unknown
Contact Don Brubaker USFWS - San Francisco Bay National Wildlife Refuge Complex San Pablo Bay
Contact Dean Kwasny Natural Resources Conservation Service Easement Programs
Contact Meg Marriott USFWS - San Francisco Bay National Wildlife Refuge Complex San Pablo Bay
Contact Anne Morkill USFWS - San Francisco Bay National Wildlife Refuge Complex Not applicable/Unknown
Contact Renee Spenst Ducks Unlimited, Inc. Not applicable/Unknown
Partner Laura Thompson Association of Bay Area Governments Not applicable/Unknown


Funding Need: $187,143,621

Restoration/Rehabilitation BCDC - San Francisco Bay Conservation and Development Commission
Restoration/Rehabilitation Ducks Unlimited, Inc.
Restoration/Rehabilitation CDOT California Department of Transportation $8,700,000
Restoration/Rehabilitation NRCS Natural Resources Conservation Service $1,656,379
Restoration/Rehabilitation Unknown/Unspecified Private Funder $1,500,000
Restoration/Rehabilitation California Wildlife Foundation $1,000,000
Enhancement SFBRA San Francisco Bay Restoration Authtority - Measure AA $200,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
2007-09-19 5.0.0 Skaggs Island Oversample estuarine perennial saline 60
2005-08-02 3.5 Napa Slough North estuarine perennial saline 78
Name File Type Submitted On Submitted By
Press Release: Sonoma Land Trust purchase of Haire Ranch Other 2017-07-11 Maggie Jenkins, 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 ( 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