The U.S. Environmental Protection Agency has warned that the Delta water tunnel project could violate the Clean Water Act and may increase harm to endangered fish, according to a formal comment letter released by the agency Thursday.

The state's proposal to build two giant water diversion tunnels in the Delta will be delayed for months because parts of the environmental document need rewriting, officials announced Wednesday.

The Bay Delta Conservation Plan would affect 3,530 acres of land in Sacramento County, mostly between Freeport and Courtland, to divert Sacramento River water. This map shows the latest official location and size of the proposed facilities.
And explore this interactive map to learn more about Delta islands, sample reader videos and read past articles about the region.
2013 is the driest year in Sacramento's recorded history. See a comparison showing the amount of rainfall in Sacramento each year from 1878 to 2013.
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