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Temporary Emergency Drought Barrier in Delta To help slow the movement of saltwater into the central Delta and prevent contamination of water supplies in the Sacramento-San Joaquin Delta, the California Department of Water Resources (DWR), in consultation with federal and state water and wildlife agencies, is moving to install an emergency, temporary rock barrier across a Sacramento-San Joaquin Delta channel. In-water work will begin June 3, 2021. The temporary barrier will be removed by November 30, 2021. Boating Detours Around Emergency Drought Barrier Travel Time Estimates – South Delta (Discovery Bay to San Joaquin River) Travel Time Estimates – Central Delta (Bethel Island to San Joaquin River) A) Route for large-mast vessels: 40 to 45 minutes from Discovery Bay C) 30 minutes from Taylor Slough or Piper Slough marinas north towards north to Old River keeping right at Frank’s Tract going north up to the False River and north up Fishermans Cut. San Joaquin River (Deep Water Channel). D) 30-40 minutes from Bethel Island marinas iansoutha to Sand Mound Slough, B) Route for smaller vessels: 40-50 minutes from Discovery Bay north to west on Dutch Slough towards the San Joaquin River pastTYL EBigR Break Georg Old River, west to Sand Mound Slough, west on Dutch Slough towards the (see note). I S L AND San Joaquin River past Big Break (see note). R Note: Maintain course as far north as possible in main channel of Dutch Slough going past Big Break. ne 5 mile-per-hour limit on both Sand Mound Slough and Dutch Slough. 12 um RIO VISTA el k Detours identified are subject to changes in natural flow conditions which are beyond the control of California Department of Water Resources.o M SYCAMOR E N I S L AND BRANNAN-ANDRUS I S L AND Sevenmile Slough M ok el um r TWI TCHEL L n e e v i I S L AND R B O U L D I N R to Slough I S L AND en DECKER Threemile at ough am ISLAND Pot o Sl cr Sa WEBB BRADFO R D TRACT VENI C E West False River I S L AND Barrier I S L AND Mayberry Slough r Fishermans Cut e False SHERM AN I S L AND iv River R uin B q P a ip Franks r o e M ANDEVILLE o J r Sherman a n S Tract I S L AND d Lake Sa J ERSEY lo T u aylor Slough gh Cabin Slough I S L AND BETHEL D u I S L AND tc Q U IMB Y h gh u I S L AND lo Big Break Slough S S 160 nd h u e ANTIOCH o e M p d n S Jersey Island a l o S 4 Fixed Bridge constraints: u Clearance at high tide = 15 feet g H OLLAND h Clearance at low tide = 19 feet H O TCHKI S S OAKLEY TRACT BACO N TRACT I S L AND MILDRED Rock Slough I S L AND 4 Old VEAL E TRACT R iver PA L M TRACT O R W OOD TRACT WOODWARD Marina Boating detour route Indian Slough ISLAND Woodward Canal 0 0.5 1 2 3 4 miles Discovery V I C T O R I A Bay I S L AND More drought information is available at DWR’s Drought webpage: https://water.ca.gov/Water-Basics/Drought.

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