CDOT - Highway 101 High Occupancy Vehicle (HOV) Lane Widening and Improvements: Steele Lane to Windsor River Road Project

Status Completed County Sonoma
Project Type Compensatory mitigation Location Not Mapped
Project Area (Acres) 0.16 Last Updated 20 May 2021
Project Abstract The Project is located along Highway 101 in Sonoma County, from Steele Lane in Santa Rosa to Windsor River Road in Windsor, between post mile (PM) 21.7 and PM 29.3. Completion of the Project will complete one of the remaining portions of the planned continuous Highway 101 HOV system, which will reduce traffic congestion.
Project Groups Caltrans 401 Projects
Administrative Region North Coast Regional Water Quality Control Board - Gil Falcone, Kaete King, NCRWQCB

Project Identification

04-0A100 Caltrans - Expenditure Authorization
2007/06099:DHW NMFS - Biological Opinion/Take Permit
2003062101 SCH - State Clearinghouse Number
1B07177WNSO SWRCB - 401 Certification Letter (e.g., Site Number or WDID)
721033 SWRCB - CIWQS Place Number
1-1-05-F-0300 USFWS - Biological Opinion/Take Permit

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Steele Lane to Windsor River Road None Restoration (unspecified) Vegetation Management Riverine Wetland Riparian area 0.16 Construction completed

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
CDOT - Highway 101 High Occupancy Vehicle (HOV) Lane Widening and Improvements: Steele Lane to Windsor River Road Project (Impact) Unknown/unspecified wetland habitat 0.47 Lost Permanent
CDOT - Highway 101 High Occupancy Vehicle (HOV) Lane Widening and Improvements: Steele Lane to Windsor River Road Project (Impact) Unknown/unspecified wetland habitat 2.15 Lost Temporary


Steele Lane to Windsor River Road Completed 0.16


DateTypeDescriptionSite Name
2013-07-10 Project end date
2008-07-10 Permit Amended certification.
2008-04-15 Permit Amendment to the USFWS Biological Opinion with an Incidental Take Permit.
2008-03-21 Project start date


Contact California Department of Transportation District 2


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data
Name File Type Submitted On Submitted By
Mitigation and Monitoring Plan Plan Or Permit 2020-02-26 SFEI, SFEI
Section 401 Water Quality Certification Plan Or Permit 2019-07-08 SFEI, SFEI

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