Sacramento Valley – East Butte (consolidated into Sacramento Valley Butte 5-021.70)

2003: Bulletin 118 basin description

2014: Basin prioritization – medium. Comments: GW basin provides underflow to Butte Creek which supports endangered spring-run salmon. GW Use based on B118-03 and 2005 Butte County Inventory data

2018: Draft basin prioritization – high because of out-of-basin water exports. Per 2018 draft basin prioritization: Groundwater-related transfer  “Type A” in which local groundwater is pumped to allow for diversion of surface water. Basin boundary modification request pending potentially incorporating the Corning 5-021.51, Colusa 5-021.52, Vina 5-021.57, West Butte 5-021.58, Sutter 5-021.62, and Wyandotte Creek 5-021.69 subbasins

2019: Basin boundary modified. Per DWR: It “consists of four parts. The first part revises and expands the Vine subbasin to cover groundwater dependent areas currently included in the northern portions of East Butte and West Butte subbasins. The modification extends the Butte County portion of Vina Subbasin southerly to the northern boundary of Western Canal Water District. The resulting Vina subbasin includes the City of Chico, unincorporated Durham, and the Durham Irrigation District. The second part modifies the western boundaries of the existing Butte County portion of Vina, and West Butte subbasins, near the Sacramento River to align with the Butte County line. The third part revises the southern boundary of the East Butte subbasin to follow the Butte/Sutter County line except for the Biggs-West Gridley Water District and Reclamation District 1004 jurisdictional boundaries; which results in these Districts being entirely within the resulting Butte subbasin. The fourth part consolidates the remaining East Butte and West Butte subbasin areas to form the Butte subbasin. Thirteen letters of support are associated with this request as well as the requesting agencies response to public comments. The request satisfies regulatory requirements for each jurisdictional modification.” And: “The basin boundary modification revises and extends the northern boundary of the Sutter subbasin north to match the Sutter County line, except where the Biggs-West Gridley Water District jurisdictional boundary lies within Sutter County. The eastern boundary of the East Butte subbasin, the eastern boundary of the Sutter subbasin, and the northern boundary of the North American subbasin are revised to align with the shared Sutter and Yuba County line, except where the Yuba County Water Agency lies within Sutter County. The western boundary of the Sutter and East Butte subbasins are revised to follow the Sutter and Colusa County line, except where Reclamation District 1004 lies within Sutter County.”