CDOT - HUM, Highway 299, HUM 299 Curve Improvement Project

Status Planning County Humboldt
Project Type Compensatory mitigation Location 40.90663° N, -123.72817° W Map
Project Area (Acres) No Data Last Updated 22 November 2022
Project Abstract The California Department of Transportation (Caltrans), in conjunction with the Federal Highway Administration, proposes to implement the Hum 299 Curve Improvement Project (EA: 01-0J410) to decrease collision rates and improve the overall safety of curves on State Route (SR) 299, between Post Miles (PMs) 30.7 and 33.4 near the town of Willow Creek
Project Groups Caltrans 401 Projects
Administrative Region North Coast Regional Water Quality Control Board - Gil Falcone, Kaete King, NCRWQCB

Project Identification

EFIS 0119000025 Caltrans - Enterprise Financial Infra-Structure Number
01-0J410 Caltrans - Expenditure Authorization
WDID No. 1B22033WNHU SWRCB - 401 Certification Letter (e.g., Site Number or WDID)

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
No Data

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
CDOT - HUM, Highway 299, HUM 299 Curve Improvement Project - Impact Riverine Wetland < 0.1 Lost Permanent
CDOT - HUM, Highway 299, HUM 299 Curve Improvement Project - Impact Riverine Wetland 0.17 Lost Temporary


In-progress/Implementation Construction planned No Data


DateTypeDescriptionSite Name
2029-10-15 Project end date Project End Date would occur once revegetation goals are met; Monitoring of revegetation goals would continue for up to 5 year after construction is anticipated to be completed in October 2024
2023-01-02 Groundwork start Construction would start January 2023
2022-10-11 Project start date M500 Approve Contract date 10/11/2022
2022-06-13 Permit Water Quality Certification issued for Highway 299 PM 30.7 & 33.35 Curve Improvement Project (EA: 01-0J410) WDID No. 1B22033WNHU


Agency Staff California Department of Transportation Not applicable/Unknown.


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data
Name File Type Submitted On Submitted By
Revegetation Plan Plan Or Permit 2022-06-16 Cristina Grosso, San Francisco Estuary Institute
Water Quality Certification Plan Or Permit 2022-06-16 Cristina Grosso, San Francisco Estuary Institute

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