Trinity DOT Wildwood Road Hayfork Bridge Replacement Project

Status In-progress County Trinity
Project Type Compensatory mitigation Location 40.40080° N, -123.05806° W Map
Project Area (Acres) 0.24 Last Updated 11 May 2016

Project Identification

1A14095WNTR SWRCB - 401 Certification Letter (e.g., Site Number or WDID)
CW‐809461 SWRCB - CIWQS Place Number

Habitat Plan

ActivityHabitatSubHabitatAcresActivity StatusWater Regime
Restoration Riverine Wetland Riparian area 0.24 Construction in-progress Riparian

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data


Bridge Replacement Riparian Mitigation Construction in-progress 0.24


DateTypeDescriptionSite Name
2015-03-23 Permit 401 Water Quality Certification issued


Contact Jake Shannon North Coast Regional Water Quality Control Board 401 WQ Unit


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Criteria

StatusDetailsEvaluation Date
No Data

Project Description

The primary purpose of the Project is to replace the existing single‐lane Wildwood Road Bridge (No. 05C‐0086) with a wider two‐lane bridge. The current bridge was determined to be structurally deficient, due to substandard load carrying capacity, in 2006. The Project will locate the replacement bridge centerline approximately 36 feet north of the existing bridge centerline, allowing vehicle access to continue throughout the construction period. The Project consists of a 162‐foot long structure with a threespan configuration measuring 50 feet/62 feet/50 feet, with a cast‐in‐place, posttensioned, reinforced concrete slab. The new piers and abutments will be within the 100 year flood plain, but outside of the ordinary high water mark (OHWM). Instream construction activities will be limited to the greatest extent practicable, but will include the excavation and removal of the existing bridge foundations, and possibly dewatering and/or water diverting activities if necessary. Roadway embankment fill will be placed outside of the OHWM. Gravel work pads will be constructed on each bank of Hayfork Creek immediately downstream of the new bridge alignment along the edge of the channel, and within the OHWM. Work pads will be constructed with suitable sized salmon spawning gravels that meet the Caltrans Gravel Cleanliness Specification 227 with a score of 85 or higher (fish rock) topped with compactable crushed rock, separated by a layer of geotextile fabric. Concrete k‐rails may be used to contain rock along the work platform edges. The crushed rock, k‐rails, and geotextile fabric will be removed upon completion of construction and the fish rock will be allowed to distribute in and adjacent to the channel.
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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