Tuolumne River Bobcat Flat Salmonid Habitat Restoration - Duck Slough

Status Completed County Stanislaus
Project Type Non-mitigation Location 37.63303° N, -120.56269° W Map
Project Area (Acres) 2.75 Last Updated 20 May 2021
Project Abstract Duck Slough restored a gold dredger swale into a productive and valuable flowing side channel. Goals included: 1) constructing off-channel winter rearing habitat for fry and juvenile salmonids; 2) increasing foraging opportunities for outmigrating salmonids; and 3) reduction of predator habitat such as black bass.
Administrative Region California Department of Fish and Wildlife - Hildie Spautz, CDFW

Project Identification

P1596021 CDFW - Prop 1 Grant ID
160020160107-R4 CDFW - Streambed Alteration Agreement

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Duck Slough None Restoration (unspecified) Sediment Management Riverine Wetland Shaded Riverine Aquatic 2.75 Completed Perennial non-tidal

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data


Duck Slough Completed 2.75


DateTypeDescriptionSite Name
2017-01-05 Inspection Inspection of site during 8,000 cfs release from New Don Pedro Dam and spill over LaGrange Dam.
2016-11-15 Inspection As-built survey after completion of the project
2016-09-29 Groundwork end Duck Slough
2016-09-29 Groundwork end Duck Slough earthwork is complete.
2016-09-01 Groundwork start Duck Slough earthwork begins
2016-06-30 Project start date Watershed Restoration Grant Program - Term of agreement: June 30, 2016 - December 31, 2018
2016-05-10 Other Duck Slough 100% design drawings stamped by PE licensed in California and submitted to CDFW.
2016-05-05 Permit Nationwide Permit Pre-Construction Notification (PCN) Form submitted
2016-01-01 Groundwork start Duck Slough


Agency Staff Dave Boucher Tuolumne River Conservancy Officer
Contractor Fred Meyer Tuolumne River Conservancy Channel Restoration, Engineering
Landowner Allison Boucher Tuolumne River Conservancy Board Officer


None Restoration (unspecified) CDFW Prop 1 - Watershed Restoration Grant Program $453,618

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Criteria

StatusDetailsEvaluation Date
More than 50% criteria met Use of CCC personnel for revegetation of site 2017-01-04
All criteria met Construction of new point bars will support channel complexity and provide key salmonid rearing habitat across range of flows. 2016-11-15
All criteria met Project will be flood compliant, able to pass a flood flow of 15,000 cfs. 2016-11-15
All criteria met Eliminate salimoid stranding and predation problems 2016-11-15
All criteria met Increased rearing habitat quantity and quality for salmonids will assist in the recovery of these target species 2016-11-15
All criteria met Project implementation will result in a restored naturally functioning and self-maintaining side channel with alluvial attributes. 2016-11-15

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 (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.

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CRAM Site Scores