Marine Stadium Eelgrass Donor Beds

Status Planning County Los Angeles
Project Type Compensatory mitigation Location 33.76573° N, -118.12579° W Map
Project Area (Acres) No Data Last Updated 20 May 2021
Project Abstract This entry is to track the usage of eelgrass donor beds in Marine Stadium in order to ensure protection and preservation of eelgrass beds, a public trust resource. Projects that have used eelgrass donor sites in Marine Stadium include Alamitos Bay Marina Rehabilitation, Colorado Lagoon Restoration, and other dredging and dock construction projects.
Administrative Region California Department of Fish and Wildlife (Region 7) - Hildie Spautz, CDFW

Project Identification

No Data

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Northeast Marine Stadium None Acquisition/Preservation/Protection Unspecified Estuarine Wetland Submerged aquatic vegetation No Data Planning in-progress Fully tidal
Western Marine Stadium None Acquisition/Preservation/Protection Unspecified Estuarine Wetland Submerged aquatic vegetation No Data Planning in-progress Fully tidal

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data


Northeast Marine Stadium Planning/Scoping No Data
Western Marine Stadium Planning/Scoping No Data


DateTypeDescriptionSite Name
2017-08-15 Habitat survey Eelgrass (Zostera marina) Transplanting and Surveys done for mitigation requirements associated with the Alamitos Bay Marina Revitalization Project (Basins 3, 5, 6 & 7 dredging impacts to eelgrass habitat. Pre-and Post transplant surveys were conducted to determine the health, density and the areal extent of the donor eelgrass sites. Following eelgrass collection on 8/15/2017, the density was 154.00 turions/m2 at Marine Stadium donor beds site 2 and 3. A total of 3,130 turions were harvested from site 2 and 3, which was 0.33% of the eelgrass beds. Based on the information in the September post-construction report, it does not appear harvesting had a significant effect on donor bed densities. Donor bed site 1 on the north end of Marine Stadium was not used, but the density was calculated at 71.4 turions/m2 on 7/14/2017 during a pre-construction survey.


Agency Staff Loni Adams California Department of Fish and Wildlife Not applicable/Unknown


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Criteria

StatusDetailsEvaluation Date
All criteria met No more than 10 percent of the eelgrass donor bed should be harvested within any one quadrate. Number of turions to be harvested within a quadrate should be determine by the mean density of the bed prior to harvesting via donor bed surveys. The donor bed surveys should be done within the same growing season as the transplanting event (or on the same day just prior to the transplant event if necessary). 2017-08-15

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.

Display Habitat Development Curves For Wetland Type:

CRAM Site Scores