EA 29763 SR 84 Expressway Widening and SR 84/1-680 Interchange Improvements Project Alameda County

Status Planning County Alameda
Project Type Compensatory mitigation Location 37.61316° N, -121.84752° W Map
Project Area (Acres) 0.36 Last Updated 20 May 2021
Project Abstract This Clean Water Act (CWA) section 401 Water Quality Certification (Certification) and Order (Order) is issued to the Alameda County Transportation Commission (ACTC or Permittee).

Project Identification

0415000040 Caltrans - Expenditure Authorization
29763 Caltrans - Expenditure Authorization
WDID# 2 CW435077 SWRCB - 401 Certification Letter (e.g., Site Number or WDID)

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
SR 84 Expressway Widening and SR 84/I-680 Interchange Improvements Project None Enhancement Infrastructure Seasonal Wetland Unknown/Unspecified 0.36 Construction planned Seasonal non-tidal

Related Habitat Impacts

HabitatAcres LostType of Loss
No Data


SR 84 Expressway Widening and SR 84/I-680 Interchange Improvements Project Construction planned 0.36


DateTypeDescriptionSite Name
2020-07-10 Project entered Project entered
2020-07-10 Project submitted Project submitted
2020-06-24 Project entered Permit Received 6/24/2020 Construction Dates 3/16/2021 - 8/1/2024. On-Site Wetland, Creek Channel, and Riparian Monitoring. The Permittee shall monitor the on-site modifications for a minimum of five years for wetlands, waters, and uplands, and 10 years in areas of creek channel impacts and riparian planting establishment, or until attainment of performance standards. The Permittee shall monitor the creek channel modifications and riparian enhancements for a minimum ten-year period to demonstrate the Project’s impacts have been sufficiently mitigated and whether any adverse direct or indirect impacts to beneficial uses occur following Project completion. The annual monitoring shall assess the upstream and downstream geomorphic conditions of Vallecitos Creek. Monitoring shall include a survey of the channel longitudinal (thalweg) profile and cross-sections at 25-foot intervals through the Project limits in years 0 (as-built), 1, 5, and 10. Off-site monitoring at Collier Canyon Mitigation Preserve. The Permittee shall monitor off-site riparian plantings, wetlands establishment, and riparian rehabilitation for a minimum of five years for wetlands, waters, and uplands, and 10 years for riparian planting establishment, or until attainment of performance standards, as described in the Mitigation and Monitoring Plan for the Collier Canyon Preserve (SR- 84 Widening and SR-84/I-680 Interchange Improvement Project), dated June 2020.
2015-06-11 Project start date Estimated date


Contact Jayshree Chauhan California Department of Transportation Environmental Planning and Engineering, Office of Water Quality


Funding Need: $120,000,000

No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data
Name File Type Submitted On Submitted By
401 Permit Plan Or Permit 2020-07-10 Xavier Fernandez, San Francisco Bay Regional Water Quality Control Board

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.

Display Habitat Development Curves For Wetland Type:

CRAM Site Scores