Grassland Bypass Project

8 Documents in Project


SCH Number
Lead Agency
San Luis and Delta Mendota Water Authority
Document Title
Grassland Bypass Project
Document Type
NOD - Notice of Determination
Present Land Use
Open space, agriculture, wildlife refuge
Document Description
Prior to 1996 when the interim project was implemented, subsurface agricultural drainage water was conveyed through channels used to deliver water to wetland habitat areas which limited Reclamation's ability to deliver fresh water to the wetlands. The Project will continue to consolidate subsurface drainage flows on a regional basis (from the 97,000-acre Grassland Drainage Area (GDA) after source control measures apply the drainage to salt tolerant crops to reduce the volume, utilize a 4-mile channel to place it into the Federal San Luis Drain (Drain) at a point near Russell Avenue (Milepost 105.72, check 19) and then utilize a 28-mile segment of the Drain to convey the remaining drainage flows around wetland habitat areas, after which it is discharged to Mud Slough and subsequently reaches the San Joaquin River. The project has reduced the volume of agricultural drainage water discharged from the GDA, resulting in significant environmental improvements to wetlands water supply channels and the San Joaquin River. The project includes wetland enhancement as mitigation for discharges to Mud Slough. The project also includes a monitoring program with biological, water quality, and sediment management components. Results of the monitoring program are reviewed by an Oversight Committee quarterly, or as necessary, to implement the Use Agreement.

Contact Information

Joe McGahan
Agency Name
San Luis and Delta-Mendota Water Authority
Contact Types
Lead/Public Agency


Los Banos
Fresno, Merced, Stanislaus
Cross Streets
I-5, SR 165, SR 152, SR 33, and SR 140
Total Acres
~ 97,400
State Highways
165, 152, 33
San Joaquin River, Mud Slough, San Luis Drain

Notice of Determination

Approving Agency
San Luis & Delta-Mendota Water Authority
Approving Agency Role
Lead Agency
Approved On


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA

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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