Huff's Corner Levee Raise and Channel Reconfiguration Project

Summary

SCH Number
2021050214
Lead Agency
Yolo County
Document Title
Huff's Corner Levee Raise and Channel Reconfiguration Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
Existing levee road; creek riparian area; agricultural land

Document Description
The Project was developed by Yolo County and is funded through a cost-share grant administered by the CA Department of Water Resources via their Flood System Repair Program (FSRP) – Contract Number 460013693. While the majority of costs to design and construct the Project are funded by FSRP, Yolo County provides a significant share of costs in the form of direct expenditures and in-kind services with multiple Yolo County Staff. There are two distinct components of this Project. The first is the levee “raise,” which is more accurately described as a restoration action to return the levee to the original design height. The second component is the Cache Creek channel reconfiguration. Both components are fully analyzed and discussed in greater detail in this IS/MND. *Levee Restoration USACE Periodic Inspection Reports identify the entire 2,700-foot reach as being freeboard deficient (i.e., below the design height). The Project will raise the entire reach approximately 4.0 to 6.0 feet to meet the 1957 design profile, which includes 3-feet of freeboard (levee that is not under water during a particular water level to which it is designed). County Road 18 is located on the levee crown over the western 1,100-feet of the proposed levee raise; the Project includes removal and replacement of the affected section of County Road 18. To accomplish this required elevation, the design includes widening the base of the levee on the land side by approximately 12 to 15 feet and will include a revised Operations & Maintenance (O&M) Easement corridor extending an additional 15 feet beyond the new land side toe of the levee. Furthermore, the portion of the levee that extends northward from the hairpin turn of County Road 18 to I-5 will be completely degraded down to level earth and a new levee will be built in the same location. *Channel Reconfiguration The right bank of Cache Creek at Huff’s Corner has approximately 100 linear feet of near-vertical bank, 30 to 50 feet high, which is undercut into the levee slope. The Project will repair this erosion site and is designed to address the root cause of the problem, namely an abrupt, near 90-degree bend of Cache Creek at the site of the worst erosion, before reaching the I-5 bridge. Significant point bar deposition has occurred on the inside edge of the bend opposite the eroded scarp. A vegetated island is also in the channel at this location. The point bar and mid-channel island both have the effect of constraining the river flow, thereby increasing erosive potential, and pushing that highly erosive flow up against the eroding scarp and threatening to erode a bank stabilization project implemented in 2009. The Project will address these issues with a three-pronged approach. First, sediment will be removed and off-hauled from the left-side secondary channel. Second, some of the vegetation currently stabilizing the mid-channel island will be removed. Finally, a sacrificial terrace will be constructed along the right bank which will serve to reduce flow velocity against the bank and direct flow more towards the center of the channel. *Project Details Both components of this Project will be constructed concurrently in 2022. The Project may also initiate some pre-construction activities such as tree removal, vegetation removal, general site preparation, and utility relocations in advance of major construction with proper approvals and permissions in place.

Contact Information
Casey Liebler
Lead Agency
Lead/Public Agency / Project Applicant
625 Court Street Room 202
Woodland, CA 95695

Phone : (530) 666-8236
Casey.Liebler@yolocounty.org

Location

Coordinates
38°43'19"N 121°48'30"W
Cities
Woodland
Counties
Yolo
Regions
Unincorporated
Cross Streets
County Road 97A, County Road 18
Zip
95695
Total Acres
9.23
Parcel #
On portions of 025-350-004; 025-320-010; 027-180-019; 025-310-025; 025-310-044; 025-320-005.
State Highways
Interstate 5
Schools
Cache Creek High School (14320 2nd St, Yolo, CA 95697)
Waterways
Cache Creek

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Maintenance of existing levee, excavation of in-channel sediment)
Local Action
Levee Maintenance & Flood Hazard Development Permit
Project Issues
Aesthetics Agriculture and Forestry Resources Air Quality Biological Resources Cultural Resources Energy Geology/Soils Greenhouse Gas Emissions Hazards & Hazardous Materials Hydrology/Water Quality Land Use/Planning Mandatory Findings of Significance Mineral Resources Noise Population/Housing Public Services Recreation Transportation Tribal Cultural Resources Utilities/Service Systems Wildfire
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, North Central Region 2 (CDFW) California Department of Forestry and Fire Protection (CAL FIRE) California Department of Parks and Recreation California Department of Transportation, District 3 (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 Sacramento Region 5 (RWQCB) 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 Drinking Water State Water Resources Control Board, Division of Water Rights

Attachments

Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]
Huff's Corner - IS-MND (complete)   PDF 18899 K Huff's Corner - Notice of Intent   PDF 1345 K Huff's Corner - Summary Form   PDF 798 K
Notice of Completion [NOC] Transmittal form
Huff's Corner - Notice of Completion   PDF 1039 K

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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