Restoration of Priority Freshwater Wetlands for Endangered Species at the Cosumnes River Preserve

Status Completed County Sacramento
Project Type Repair/Maintenance Location Not Mapped
Project Area (Acres) 50.00 Last Updated 7 December 2023
Project Abstract Restore seasonal and perennial wetlands through the removal of highly invasive Uruguayan water primrose (Ludwigia hexapetala) and its associated biomass and sediments. Mechanical treatments will be followed by an aquatic herbicide program to maintain long-term control of primrose throughout the lake bed.
Project Groups SSJDC Prop 1
Administrative Region Sacramento-San Joaquin Delta and Suisun Marsh (Prop 1) - Rachel Wigginton, SSJDC

Project Identification

No Data

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Horseshoe Lake None Restoration/Rehabilitation Riverine Wetland Open water 30.00 Completed Perennial non-tidal
Horseshoe Lake None Enhancement Upland Grassland 20.00 Completed None

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data


Horseshoe Lake Completed 50.00


DateTypeDescriptionSite Name
2023-11-06 Update AmeriCorps Group - monitored oak tree cages, data collection of oak trees, vegetation clearing, mapped invasives for future treatment, planted new acorns and plugs
2023-10-10 Habitat survey GGS Surveys
2023-10-06 Update Stinkwort Eradication
2023-05-01 Habitat survey Bumblebee surveys on the property is May-June and again in August-September as part of the statewide Xerces Bumblebee Atlas Project.
2023-05-01 Update Nesting box surveys Spring
2023-04-01 Update Cattle Grazing in uplands
2023-01-31 Report Post Close Annual Implementation Status Update
2023-01-01 Other Site Under Water with High-Water and Flooding for first few months of 2023
2022-11-20 Update Goat grazing
2022-10-10 Habitat survey GGS Surveys
2020-10-22 Report GGS Report
2020-10-21 Habitat survey GGS Sruvey
2020-09-30 Report Watershed Assessment
2020-09-25 Update Oak Tree Survivorship Count and watering
2020-09-16 Habitat survey GGS Survey
2020-08-27 Other Oak Tree Watering
2020-08-22 Update GGS Traps removed
2020-08-20 Habitat survey Quarterly Survey
2020-08-19 Habitat survey GGS Survey
2020-08-10 Habitat survey Hydrology Survey
2020-07-16 Habitat survey Carcus Survey
2020-07-13 Habitat survey Hydrology Survey
2020-07-08 Habitat survey GGS Survey
2020-07-01 Other Primrose Treatment
2020-06-25 Habitat survey Carcus Survey
2020-06-25 Update Oak Tree Irrigation
2020-06-23 Update GGS Trapping began
2020-06-17 Habitat survey GGS Survey
2020-03-14 Update Volunteer Activities suspended
2020-02-15 Habitat survey Quarterly Survey
2020-01-31 Other Oak Tree Planting
2020-01-17 Update Oak Tree Planting
2020-01-17 Other Oak Tree Planting
2019-11-16 Habitat survey Quarterly SUrvey
2019-08-17 Habitat survey Quarterly Survey
2019-05-18 Habitat survey Quarterly Survey
2019-02-25 Project submitted As Builts Submitted to County
2019-02-16 Habitat survey Quarterly Survey
2019-01-31 Update Oak Tree Planting
2019-01-04 Permit Notice Of Termination for SWPPP
2018-12-15 Update Rookery Oak Tree Planting Day
2018-11-08 Permit 401 Notice of Project Complete
2018-11-08 Update Seeding Completed
2018-10-26 Groundwork end Construction Completed
2018-09-27 Monitoring end Pre-restoration baseline monitoring completed
2018-09-24 Groundwork start Mobilization of Equipment
2018-09-20 Inspection Pre-construction meeting with Sacramento County Inspectors
2018-08-01 Permit CWA 401 completed
2018-06-26 Permit Final grading plans approved by Sacramento COunty
2018-05-23 Permit Section 1602 Notification of Streambed Alteration (LSA) completed
2018-05-01 Permit CWA 404 completed
2018-03-28 Update Initial 2018 rookery valley oak tree planting completed along South Fork arm of the lake. 80 acorn sets planted and fenced to protect from cattle and other wildlife. Additional maintenance and plantings are to occur over each year through 2020. The planting was completed by staff and volunteers.
2018-03-22 Report Baseline Level I Watershed Assessment Report completed
2017-08-30 Permit NEPA Decision Record signed
2016-10-12 Monitoring start Pre-restoration baseline monitoring started


Agency Staff Harry McQuillen U.S. Bureau of Land Management Cosumnes River Preserve
Agency Staff Amber Veselka Sacramento County Parks and Recreation Not applicable/Unknown


Funding Need: $1,200,000

None Restoration/Rehabilitation Sacramento-San Joaquin Delta Conservancy $942,631
None Restoration/Rehabilitation California Department of Fish and Wildlife $89,900

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data
Name File Type Submitted On Submitted By
Project Photos Photo 2021-01-14 Amber Veselka, Sacramento County Parks And Recreation

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