Cochran Creek (Humboldt Bay) Fish Passage and Habitat Rehabilitation Implementation Project

Status Completed County Humboldt
Project Type Non-mitigation Location 40.80071° N, -124.08957° W Map
Project Area (Acres) 6.60 Last Updated 28 February 2024
Project Abstract The project restored fish passage between Cochran Creek and Humboldt Bay by replacing an outdated tidegate; and enhanced and expanded tidal, brackish, freshwater and riparian habitat on Cochran Creek and Quail Slough, and increase flood protection of agricultural lands.
Project Groups CDFW Prop 1 | Humboldt Bay Estuary Enhancement
Administrative Region California Department of Fish and Wildlife - Hildie Spautz, CDFW

Project Identification

Q2096015 CDFW - Prop 1 Grant ID
20-003 SCC - Project Number (Restoration)
2019-00129N USACE - Nationwide General Permit

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Cochran Creek restoration site Implementation Restoration (unspecified) Estuarine Wetland Marsh 6.60 Implementation completed Muted tidal

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data


Cochran Creek restoration site Construction completed 6.60


DateTypeDescriptionSite Name
2024-03-31 Project end date
2024-01-31 Monitoring end
2022-09-02 Groundwork end final grading complete
2021-12-01 Monitoring start start of post project monitoring
2021-10-19 Other End of 2021 construction season
2021-07-13 Groundwork start tidegate replaced
2020-07-01 Project start date start of CDFW grant term


Contact matthew metheny California Trout Not applicable/Unknown


Implementation Restoration (unspecified) CDFW Prop 1 - Watershed Restoration Grant Program $996,986
Implementation Restoration (unspecified) SCC State Coastal Conservancy $640,000
Implementation Restoration (unspecified) CDOT Environmental Enhancement and Mitigation Program $500,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
2023-08-08 6.1 Cochran Creek estuarine perennial non-saline 75
2023-08-08 6.1 Cochran Creek estuarine perennial saline 74
2023-08-08 6.1 Quail Slough estuarine perennial saline 67
2021-12-02 6.1 Cochran Creek AA#1 riverine non-confined 68
2021-07-01 6.1 Quail AA#2 estuarine perennial non-saline 63
2021-07-01 6.1 Cochran Creek AA#2 riverine non-confined 71
2021-07-01 6.1 Quail Slough AA#1 estuarine perennial non-saline 65
Name File Type Submitted On Submitted By
Aerial Photo of site construction Photo 2022-09-28 Matthew Metheny, California Trout
Annual Monitoring Report 2022 Monitoring Report 2024-02-05 Matthew Metheny, California Trout
Cochran Creek Baseline Conditions Final Report Monitoring Report 2024-02-05 Matthew Metheny, California Trout
County Parcel Map Photo 2022-10-24 Matthew Metheny, California Trout
Project Area Boundaries Photo 2022-10-24 Matthew Metheny, California Trout

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