Donner Pass Road Corridor Improvement - Phase 1 Project

Status Planning County Nevada
Project Type Compensatory mitigation Location 39.32593° N, -120.21613° W Map
Project Area (Acres) No Data Last Updated 20 May 2021
Project Abstract The project includes a number of improvements to enhance bicycle and pedestrian safety, such as construction of new sidewalks where they do not currently exist, crosswalk improvements along Donner Pass Road, and to address historic flooding issues in the project vicinity by upsizing existing cross-culverts that convey run-off in the area.
Administrative Region Lahontan Regional Water Quality Control Board - Tiffany Steinert, Jan Zimmerman, Elizabeth van Diepen, LRWQCB

Project Identification

No Data

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Donner Pass Road - Phase 1 None Enhancement Infrastructure Unknown/unspecified habitat None No Data Construction planned

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data


Donner Pass Road - Phase 1 Construction planned No Data


DateTypeDescriptionSite Name
2017-06-20 Permit Lahontan Regional Water Quality Control Board issued the Town of Truckee Board Order No. R6T-2017-0027, Clean Water Act Section 401 Water Certification for Donner Pass Road Corridor Improvements Phase 1 Project, Nevada County.
2017-05-09 Report The Town Council of the Town of Truckee adopted Resolution 2017-21 which adopted the Mitigated Negative Declaration for the Donner Pass Road Corridor Improvement - Phase 1 Project.
2017-05-02 Permit The Town of Truckee received certification from the United States Army Corps of Engineers, Regulatory Division (SPK-2017-00206). It was determined that activities in waters of the U.S. associated with the project are authorized by Nationwide Permit Number (NWP) 14. These activities are authorized once the CWA Section 401 permit is issued (6/20/2017).


Agency Staff Scott Mathot Town of Truckee Engineering


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

No files found.

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.

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CRAM Site Scores