Rio Hondo/Upper San Gabriel River Watershed Arundo Eradication Program

Status In-progress County Los Angeles
Project Type Non-mitigation Location 34.02967° N, -118.06514° W Map
Project Area (Acres) 45.00 Last Updated 19 August 2021
Project Abstract This project in the Whittier Narrows will remove 50 acres of untreated Arundo donax, treat resprouts in 30 acres of previously treated Arundo donax, and remove additional exotic species from both areas. Monitoring of treatment efficacy will take place throughout the five years of the project.
Project Groups Southern California Wetlands Recovery Project
Administrative Region Southern California Wetland Recovery Project - Katie Nichols, State Coastal Conservancy

Project Identification

No Data

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Rio Hondo/Upper San Gabriel River Watershed Implementation Restoration (unspecified) Riverine Wetland Riparian area 45.00 Implementation in-progress

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data


Rio Hondo/Upper San Gabriel River Watershed In-progress/Implementation 45.00


DateTypeDescriptionSite Name
No Data


Contact Jason Casanova Council for Watershed Health Not applicable/Unknown


Funding Need: $1,430,000

Implementation Restoration (unspecified) Unknown/Unspecified $970,000

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
2023-07-26 6.1 WN-RA riverine confined 60
2023-07-24 6.1 WN-RC ephemeral depressional 54
2023-07-24 6.1 WN-RA-Alt riverine confined 49
2023-07-24 6.1 WN-RB riverine confined 68
2023-07-20 6.1 WN-RD1 riverine confined 67
2023-07-20 6.1 WN-RD riverine confined 70
2022-08-16 6.1 WN-RD riverine non-confined 60
2022-08-16 6.1 WN-RD1 riverine non-confined 69
2022-08-11 6.1 WN-RC ephemeral depressional 37
2022-08-11 6.1 WN-RB riverine confined 54
2022-06-30 6.1 WN-RA-Alt riverine non-confined 57
2022-06-30 6.2 WN-RA episodic riverine single-thread 77
2021-08-19 6.1 WN-RB riverine confined 56
2021-08-19 6.1 WN-RA riverine non-confined 51
2021-08-19 6.1 WN-RA-Alt riverine non-confined 47
2021-08-19 6.1 WN-RC ephemeral depressional 43
2021-08-18 6.1 WN-RD riverine confined 64
2021-08-18 6.1 WN-RD1 riverine non-confined 65
2020-08-20 6.1 WN-RB riverine confined 68
2020-08-20 6.1 WN-RC perennial/seasonal depressional 40
2020-07-30 6.1 WN-RA riverine non-confined 64
2020-07-30 6.1 WN-RD1 riverine non-confined 69
2020-07-30 6.1 WN-RD riverine non-confined 69
2020-07-30 6.1 WN-RA-Alt riverine non-confined 64
2016-08-19 6.1 SGLT512 riverine non-confined 54
2014-09-11 6.1 SGLT512 riverine confined 58
2012-09-07 6.0 SGLT512 riverine non-confined 55
2010-09-03 5.0.2 SGLT512 perennial/seasonal depressional 58
2009-11-17 5.0.2 SGLT512 perennial/seasonal depressional 52
2007-11-26 5.0.1 Crossover Channel-SGR riverine non-confined 64
2007-10-31 5.0.1 Lario Ditch riverine confined 58

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