Denny Ditch Fish Screen Design and Build

Status Completed County Siskiyou
Project Type Repair/Maintenance Location Not Mapped
Project Area (Acres) No Data Last Updated 25 September 2017

Project Identification

IDType
2012.13.1 KTAP - Project ID

Habitat Plan

ActivityHabitatSubHabitatAcresActivity StatusWater Regime
Enhancement Riverine Wetland Channel No Data Completed

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data

Sites

NameStatusAcres
Denny Ditch Fish Screen Completed No Data

Events

DateTypeDescriptionSite Name
2012-01-01 Monitoring end Coho spawning survey (one time)
2012-01-01 Monitoring start
2012-01-01 Other Installation completed. Began delivering benefits immediately.
2012-01-01 Project end date
2010-01-01 Project start date

People

TypeNameOrganizationDepartment
Contact Thomas Franklin Unknown/Unspecified Not applicable/Unknown
Partner Unknown Siskiyou Resource Conservation District Not applicable/Unknown

Funding

ActivityFunderAmount
Enhancement PacifiCorp $145,290

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Criteria

StatusDetailsEvaluation Date
All criteria met Restored wetlands. 2012-12-31
All criteria met Installed one perforated metal cone fish screen with 4 cfs flow rate at screen. 2012-12-31
All criteria met Removed one fish barrier and made 10 newly accessible stream miles. 2012-12-31

Project Description

Description
The objective of this project was to design and install a fish screen on the Denny Ditch, located on the main stem of the Scott River. This area of the Scott River has a historic legacy of small, gravel push-up dams which seasonally block fish passage and disturb fish habitat. The project installed a fish screen on the edge (east bank) of the Scott River. In 2012, a head gate was installed below the existing channel elevation and this head gate was incorporated into a boulder deflector that provides scour to maintain water surface depth at the point of diversion. In addition, a 30-inch diameter head gate set in a concrete vault that transitions to smooth wall pipe was installed. The 30-inch smooth wall pipe continues to the existing sump pond where it will discharge when pumping occurs. This project eliminated the need for a gravel push-up dam at River Mile 50 of the Scott River. This improved juvenile and adult salmon access to the remaining 10 miles of mainstem Scott River and several key tributaries (East Fork, South Fork, Sugar Creek, and French Creek).
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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 (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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