Program Overview


Improve floodplain function for multiple purposes through voluntary collaborative partnerships with private landowners, sovereign tribal entities, government, and non-government representatives.

Working in Concert

This program will work in concert with a constellation of efforts underway in the Colusa, Butte, and Sutter Basins in the Mid-Sacramento River Valley region to improve the floodplain functional connectivity to support salmon, birds, and agriculture.


Floodplain functional connectivity complements the multiple priorities including:

Floodplain connectivity
Floodplain wildlife
Ecosystem health
Water supply
Flood control
Water quality
Indigenous cultural values
Economic prosperity
Community way of life
Carbon as a greenhouse gas
Resiliency and Flexibility


Voluntary, locally-driven program that serves as a hub for all floodplain related efforts in the region to ensure efficiency and promote coordinated actions.
Shared understanding of each other’s interests, joint investigation, and collaborative generation of options and evaluation.
Mutual respect and appreciation cultivated between sovereign tribal entities, private landowners, government and non-government representatives.
Respect and work within existing land ownership and uses; indigenous land stewardship and cultural resources; and flood management functions, including operations and maintenance.

Geographic Region

The geographic scope includes the historic floodplain of the Sacramento River from the Butte Sink in the north to the top of the Yolo Bypass in the south. The basins of focus within the historic floodplain are defined by current and potential accessibility by juvenile salmon.

Colusa Subregion

  • West of the Sacramento River
  • Defining infrastructure: Colusa Basin Drain 
  • Northern most point: Delevan Wildlife Refuge 
  • Southernmost point: Yolo Bypass 

Butte Subregion

  • East of the Sacramento River
  • Defining infrastructure: Various diversions east of the Sacramento River and West of Butte Creek 
  • Northern most point: M&T Ranch 
  • Southernmost point: Butte Slough Bifurcation

Sutter Bypass Subregion

  • East of the Sacramento River 
  • Defining infrastructure: Sutter Bypass East and West Borrows and adjacent properties 
  • Southernmost point: Fremont Weir where Sutter Bypass meets the Sacramento River

Geographic Area

Floodplain Benefits – Existing

Mid-Sac Floodplain map

Phase I: Feasibility Study

RD108 has received a Prop 68 grant from the California Natural Resources Agency for Phase I, which is scheduled for August 2021 – July 2023. In Phase I, in cooperation with landowners the program will evaluate the feasibility of reintroducing low flows during the agricultural off-season, onto lands owned by willing landowners of the Butte Sink, Sutter Bypass and Colusa Basin.  

The group will explore the feasibility of combinations of actions to increase floodplain function connectivity, which is reconnecting rivers to their historical floodplains. Potential actions might include modifications to multiple existing weirs, and gated outlet structures and/or construction of new structures, as well as and improving/creating flow conveyance infrastructure needed to reactivate floodplains.

Program Partners

Reclamation District 108

Program director and grant recipient

Kjeldsen Sinnock Neudeck (KSN)

Project manager and engineering support

Kearns & West

Stakeholder involvement and facilitation services

Larsen Wurzel & Associates

Process advisors


Hydrologic & hydraulic model development


Technical Team support, salmon benefits model development

Point Blue

Bioenergetics model development

Cramer Fish Sciences

Salmon benefits model development

Aquatic Resources Consulting Scientists

Habitat suitability criteria development

Program Resources

Planning and Engagement Process Timeline
Floodplains Reimagined Program Charter
Floodplains Reimagined Program 2-pager
Floodplains Reimagined Program 4-pager

Translate »
Skip to content