Twitchell Island Levee Improvement Project - San Joaquin River Reach

6 Documents in Project


SCH Number
Lead Agency
Reclamation District 1601
Document Title
Twitchell Island Levee Improvement Project - San Joaquin River Reach
Document Type
NOP - Notice of Preparation
Present Land Use

Document Description
RD 1601 proposes to construct levee improvements along the south side of Twitchell Island to increase the levee's resistance to erosion, provide additional freeboard for an estimated wave-run up of 4.7 feet, and provide better overall levee stability. Improvements would include ~5 mile of new foundation berm and setback levee behind and attached to the existing levee along the San Joaquin River except in front of the existing pump station, a sheet-pile wall would be installed so that the pump station, sump, and appurtenant discharge pipes would not have to be moved. Borrow materials to construct the improvements, including engineered fill, drain rock, and aggregate base would be obtained from commercially available sources likely within 50-60 miles. Some material would likely be transported to the site by truck and some by barge.

Contact Information
Rick Carter
Reclamation District 1601
Lead/Public Agency
2360 West Twitchell Island Road
Rio Vista, CA 94571

Phone : (916) 777-6992


38°45'46.2"N 121°39'02.9"W
Cross Streets
Twtichell Island Road and Jackson Slough Road
Total Acres
Parcel #
157-0130-007, 008, 024, 027-0140-00...
State Highways
Hwy 12 & 160
San Joaquin River, 3mile Slough, 7mile Slough
Other Location Info
City/Nearest Community: Rio Vista

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Flood Protection Levee)
Local Action
Levee Mod
Project Issues
Agriculture and Forestry Resources Air Quality Biological Resources Cultural Resources Cumulative Effects Flood Plain/Flooding Geology/Soils Growth Inducement Hazards & Hazardous Materials Hydrology/Water Quality Land Use/Planning Mineral Resources Noise Population/Housing Public Services Recreation Transportation Vegetation Wetland/Riparian
Reviewing Agencies
California Air Resources Board (ARB) California Department of Conservation (DOC) California Department of Parks and Recreation California Highway Patrol California Native American Heritage Commission (NAHC) California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB) California State Lands Commission (SLC) Delta Stewardship Council Department of Toxic Substances Control Office of Emergency Services, California Resources Agency State Water Resources Control Board, Division of Water Quality Central Valley Flood Protection Board California Department of Fish and Wildlife, North Central Region 2 (CDFW)

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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