Del Puerto Creek Sediment Removal Project

5 Documents in Project


SCH Number
Lead Agency
California Department of Water Resources (DWR)
Document Title
Del Puerto Creek Sediment Removal Project
Document Type
ADM - Addendum
Present Land Use
rural undeveloped with creek running between CAAQ and I-5 hwy
Document Description
The Del Puerto Creek Sediment Removal Project is located between Interstate 5 and the Governor Edmond G. Brown California Aqueduct, approximately 4 miles northwest of the city of Patterson, Stanislaus County, California. Del Puerto Creek, an intermittent creek that historically drains into the San Joaquin River, passes under the California Aqueduct (CAAQ) through a concrete underchute structure approximately 6 miles downstream of the creek. The concrete underchute structure for Del Puerto Creek consists of a 16-foot diameter culvert, wing walls, a head wall, an end wall, and concrete aprons on the inlet and outlet. The inlet apron extends approximately 53 feet from the opening of the culvert, upstream into the creek. Additionally, 278 feet of the channel was engineered and altered as part of the original structure. During high flow events, sediment and gravel are deposited in front and on top of the inlet apron via natural fluvial processes thereby reducing channel capacity and the ability of the underchute to convey natural streamflow past the CAAQ, which in turn threatens the integrity of the CAAQ levee. In 2015, DWR prepared an ISMND to analyze the potential environmental effects of maintenance activities to Del Puerto Creek to remove the silt/cobble from 200 feet upstream of the underchute’s inlet and returning the drainage to its intended condition at or slightly below the level of the concrete apron. The project included improvements to access roads, sediment removal, access ramp improvements, bank stabilization, and improvements to an adjacent drainage ditch that channels runoff from the CAAQ levee directly into the creek. After the initial sediment removal, DWR intended that biennial maintenance would occur to keep the drainage to its intended condition. As a result of delays to the planned biennial maintenance, DWR proposes to extend sediment removal and bank stabilization by 278 feet for a total of 478 feet of the channel sediment removal directly adjacent to the inlet apron on the upstream portion of Del Puerto Creek. Sediment removal will include bank stabilization efforts, removal of an invasive tree, and the stabilization of 50 feet of impacted area with clean imported soil and rip-rap. Additionally, a ramp will be repaired and temporarily extended into the channel during the project to allow equipment access into the channel; the rock drainage adjacent to the channel will be repaired as needed; the access road will be improved as needed; and spoils will be disposed nearby.

Contact Information

Gerald Snow
Agency Name
Ca Department of Water Resources
Job Title
Branch Manager
Contact Types
Lead/Public Agency / Project Applicant


Northern California
State Highways
California Aqueduct

Notice of Completion

State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 10 (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), Central Valley Flood Protection Board, State Water Resources Control Board, Division of Water Rights
Development Types
Other (Maintenance for Ca Aqueduct)
Local Actions
maintenance for CA Aqueduct
Project Issues
Biological Resources, Cultural Resources, Hazards & Hazardous Materials, Hydrology/Water Quality, Mandatory Findings of Significance, Tribal Cultural Resources


Final Document(s) [Approved_Certified draft environmental documents]

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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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