Investigations of Restorations Techniques - Dutch Slough

Status In-progress County Contra Costa
Project Type Non-mitigation Location 38.01179° N, -121.67244° W Map
Project Area (Acres) No Data Last Updated 20 May 2021
Project Abstract Invasive species colonization is a barrier to restoration project success. Initial treatment of invasive species and conventional approaches are largely unsuccessful. Competition by native species can be effective at managing invasive species. We are looking to improve the competitive advantage of native species, which is under-investigation.
Project Groups SSJDC Prop 1
Administrative Region Sacramento-San Joaquin Delta and Suisun Marsh (Prop 1) - Rachel Wigginton, SSJDC

Project Identification

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Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
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Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
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Dutch Slough Reveg In-progress/Implementation No Data


DateTypeDescriptionSite Name
2020-11-10 Monitoring end The monitoring phase of the study has ended to accommodate for data and soil sample processing and analysis. Draft manuscripts and a wetland revegetation management recommendations document will be drafted pending results.
2018-12-06 Monitoring start After implementation of the treatment blocks has finished, baseline monitoring was initiated. Monitoring methods were refined in the previous month. Drone monitoring and soil core sampling was added to the suite of monitoring methods. Monitoring will occur at various times throughout the year depending on the monitoring schedule.
2018-10-03 Update All three treatment blocks have been implemented. Dutch Slough Reveg
2018-09-05 Groundwork start DWR, UC Davis, and California Conservation Corps started study design implementation. Work included: clearing project area of invasive Ludwigia, setting up treatment markers, harvesting and planting tules and smartweed in appropriate treatment blocks.


Agency Staff Jamie Silva California Department of Water Resources Division of Environmental Services
Partner Jorge Renteria University of California, Davis Not applicable/Unknown


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Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
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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