Upper Mormon Slough Erosion Repair Project

4 Documents in Project


SCH Number
Lead Agency
San Joaquin County
Document Title
Upper Mormon Slough Erosion Repair Project
Document Type
FIN - Final Document
Present Land Use
Agricultural - 40
Document Description
The proposed project would consist of repairs to the north and south banks of the upper segment of Mormon Slough near the Escalon-Bellota Bridge in San Joaquin County, California. Mormon Slough accepts flow from the Calaveras River at Bellota and carries it to the Stockton Diverting Canal, which returns the flow to the Calaveras River. Project activities include the removal of compromised material in the channel and repairing the channel slope with a variety of materials including soil-filled rock slope protection (RSP), a coarse filter bed, earthfill, and launch rock. The repairs would consist primarily of installing RSP, which generally consists of rip-rap of varying size, soil, gravel and a textile fabric above the ordinary high water mark to prevent downward migration of the soil. To promote growth of vegetation, the RSP voids would be filled with agricultural soil and seeded with grasses (i.e., soil filled RSP). Excavation prior to placement of RSP would generally be limited to removal of loose surface debris from past slope failures, minor grading to produce relatively smooth surfaces to prepare for RSP, or to key the repairs into the existing slopes. After grading, workers would install a coarse sand or gravel filter bed that will seal cracks or openings in the base soil. A base of launch rock would be installed at the lower edge of the filter, and RSP would be laid over the filter bed.

Contact Information

Matt Zidar
Agency Name
San Joaquin County Flood Control and Water Conservation District
Contact Types
Lead/Public Agency / Project Applicant


San Joaquin
Cross Streets
State Route 26 and Escalon-Bellota Road
Total Acres
Parcel #
093-080-08; 093-180-01; 093-180-02; 091-350-080-000; 091-350-090-000; 091-350-100-000
State Highways
State Route 26
Upper Mormon Slough
5, 6,7

Notice of Completion

State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 10 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Valley Fresno Region 5 (RWQCB), California State Lands Commission (SLC), Central Valley Flood Protection Board, Delta Protection Commission, Delta Stewardship Council, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Water Quality
Development Types
Other (Erosion Control/Restoration)
Local Actions
Erosion Control/Restoration
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Energy, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Transportation, Tribal Cultural Resources, Vegetation, Wetland/Riparian


Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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