![Sacramento River Winter-Run Chinook Salmon](/-/media/DWR-Images/Fish/Sacramento-River-Winter-Run-Chinook-Salmon.png?mw=200&hash=A85A942777C91FE55BD578EA7E086E5D)
As planning and environmental review efforts continue to support DWR's determination of whether a single tunnel option to modernize Delta conveyance should be approved, an important component of the environmental review process is to assess environmental resource impacts within the Sacramento-San Joaquin Delta’s (Delta) estuary.