Department of Water Resources Home

Yolo Bypass


sutter bypass

Environmental Services

Dean Messer, Chief

3500 Industrial Blvd.
West Sacramento, CA 95691
(916) 376-9699

Mailing Address:
P.O. Box 942836
Sacramento, CA 94236-0001



Yolo Bypass Links

Lisbon Weir Fish Passage Project

photo of lisbon weir Lisbon Weir with flap gates in background. Photo Credit: Eva Olin


Modification of Lisbon Weir will be a crucial upgrade for adult migrating fish. Lisbon Weir delays migration in the Yolo Bypass. When the bypass is not flooded, salmon can only pass this rock weir when flood tides open a small section of flap gate or when a strong high tide overtops the weir. This modification project would improve fish passage throughout the tidal cycle while maintaining a reliable agricultural diversion. Completion of this project will fulfill NMFS BO RPA Action I.6.4.

Next Steps


Construction is anticipated to begin in or after 2018.

Planning and Design Status

Planning for this project is at the conceptual design level.