Native habitat and natural river function in the Delta have been degraded by construction of the levee network and conversion of the floodplain to agricultural and rural development, as well as management of the system for municipal, industrial and agricultural water supplies.
The Delta was named an ecosystem of national significance. It is a critical link in the Pacific Flyway, a major north-south route of travel for migratory birds in America, and is protected through the Migratory Bird Treaty Act of 1918.
Natural resource specialists agree that the remaining ecosystems in the Delta no longer maintain the functions and richness that defined the pre-channelized system, and that the measures of ecological health will continue to decline without preventive action. Not only is it certain that these natural systems will not recover their defining attributes under current conditions, it is unlikely that even the current, degraded ecological conditions can be sustained into the future.
Concern elevated during the 1990s that widespread failure of Delta levees – especially after an earthquake – could cause salt water from San Francisco Bay to intrude into the Delta, effectively shutting down water supply for the 25 million Californians who depend on water pumped from the Delta. This concern resulted in two broad Corps initiatives.
First, to address the immediate threat of levee failure, Congress authorized the CALFED Levee Stability Program, which provided funding for a suite of individual levee fixes to quickly shore up weak spots. While that program produced 31 reconnaissance-level reports for individual projects, and funded the completion of the Delta Flood Map Book, it has not resulted in any projects moving toward construction. Its remaining appropriated funded is being used to further improve Corps and state Delta flood emergency response coordination under a memorandum of agreement with DWR.
Second, the Delta Islands and Levees Feasibility Study (Delta Study), is the Corps’ mechanism to participate in a cost-shared solution to address ecosystem restoration and flood risk management in the Delta and Suisun Marsh area. A feasibility cost-share agreement was executed in May 2006 with the California Department of Water Resources, the non-Federal sponsor for the study.
The Corps is concurrently a cooperating agency in reviewing the State of California's Bay Delta Conservation Plan ahead of eventual permitting that must be processed for regulatory and navigation/levee safety impacts. Comments on the public draft of the BDCP are due in June 2014.
Produced with the California Department of Water Resources in 2011, this map book provides a working framework to aid each Delta community in their emergency response planning.
A digital version may be downloaded HERE. (File size 180MB)
May 7, 2014, 5 - 7 p.m. -- Old Sugar Mill, 35265 Willow Avenue, Clarksburg, Calif. 95612
May 9, 2014, 2 - 4 p.m. -- Sheraton Grand Hotel, 1230 J Street, Sacramento, Calif. 95814
This feasibility study is the Corps’ mechanism to participate in a cost-shared solution to a variety of water resources needs for which we have the authority. Results of the Department of Water Resourcess' (DWR) Delta Risk Management Strategy (DRMS) studies will be used to define problems, opportunities, and specific planning objectives.
The feasibility study will address flood risk management, ecosystem restoration, water quality, water supply, and a variety of other issues. A feasibility cost-sharing agreement (FCSA) was executed May 26, 2006 with DWR, our non-Federal sponsor.
The total cost of the feasibility study is currently $12,000,000; cost shared 50/50 with the California Department of Water Resources.
FY 08 appropriations at $859,000
FY 09 appropriations at $478,000
-Reprogrammed additional $150,000
FY 10 appropriations at $394,000
FY 11 appropriations at $239,000
FY 12 appropriations at $971,000
FY 13 appropriations at $1,012,970
FY 14 appropriations at $447,000
Draft integrated feasibility report & environmental impact statement
A -- Scoping Report
B -- Econ Report
C -- Flood Risk Management
D -- Engineering Report
E -- Cost Report
F -- HEP
G -- Special Species
H -- 404b1
I -- Air Quality
J -- Cultural
Final Independent External Peer Review Report