12/6/2021

10 Day Northern California Precipitation Forecast: As of this morning, there is a 37% chance of precipitation today, a 24% chance tomorrow, a 24% chance on 12/8, a 37% chance on 12/9, a 24% chance on 12/10, a 5% chance on 12/11, a 22% chance on 12/12, a 34% chance on 12/13, a 43% chance on 12/14 then a 39% chance on 12/15.

 

From CDEC: Precipitation to date for water year 2021-2022 - As of 12/6/2021:

Northern Sierra Precipitation Index: 15.8" = 157% of average for this date

 

San Joaquin Precipitation Index: 7.5" = 108% of average for this date

 

Tulare Basin Precipitation Index: 2.8" = 60% of average for this date

 

From CDEC: Average statewide snow water equivalents as of 12/6/2021:

North: 0.6" = 10% of normal for this date

 

Central: 0.8" = 15% of normal for this date

 

South: 1.2" = 30% of normal for this date

 

Statewide: 0.9" = 16% of normal for this date

 

River Flows (Current and estimated future flow rates from NOAA's California Nevada River Forecast Center and CDEC)

Sacramento River (I Street Bridge/Freeport Bridge)

The 12/5 daily average reported 5,887 cfs and may be decreasing to 5,690 cfs by 12/11.

Feather River (at Boyd's Landing)

The Feather is reporting 1,991 cfs and may increase to 2,042 cfs by 12/11.

San Joaquin River (near Vernalis)

The San Joaquin is reporting 554 cfs and may increase to 636 cfs by 12/11.

Delta Cross Channel Gate Operation (From the USBR website)

Posted: 11/29/2021

Delta Cross Channel Gates will close on Tuesday, November 30, 2021 at approximately 1000 hours. Gates will remain closed until further notice.

Comment: Rio Vista flow requirement/Seasonal closure.

´┐ŻPLEASE NOTE: GATES MAY NEED TO BE CLOSED WITH SHORT NOTICE IF A FISHERY CONCERN IS IDENTIFIED.

 

EC and Bromide - Banks Pumping Plant, Jones Pumping Plant, Clifton Court Forebay (EC only), San Joaquin River at Vernalis, Gianelli Pumping Plant, Sacramento River at Hood (EC only)

No major changes over the period. Levels may decrease if any of the possible precipitation pans out over the next week.

Banks: EC - 506 uS/cm, Br - 0.30 mg/L, 10 Days ago: 499 uS/cm and 0.31 mg/L

Jones Daily Average: EC - 593 uS/cm, Br 0.34 mg/L 10 days ago: 626 uS/cm, 0.31

Clifton Court Forebay Daily Average: EC 595 uS/cm, 10 days ago: 571 uS/cm

Vernalis: EC 616 uS/cm, (Est.) Br 0.21, 10 days ago: 617 uS/cm and Br 0.25

Gianelli: EC - 566 uS/cm, Br 0.23 mg/L, 10 days ago: 528 uS/cm and 0.22 mg/L

Hood: EC - 203 uS/cm, 10 days ago: 218 uS/cm

 

Organic Carbon, TOC, and DOC - Banks Pumping Plant, Jones Pumping Plant, San Joaquin River at Vernalis, Gianelli Pumping Plant, Sacramento River at Hood

Since there has not been any precipitation or any other change, conditions remained relatively stable over the period.

Banks: TOC = 5.0 mg/L, DOC = 4.8 mg/L, 10 days ago: 4.7, 4.5

Jones: TOC = 4.1 mg/L, DOC = 4.0 mg/L, 6 days ago: 3.9, 3.8

Vernalis: (Est.) TOC = 2.1 mg/L, DOC = 2.1 mg/L, 10 days ago: 2.5, 2.4

Gianelli: TOC = 4.0 mg/L, DOC = 3.8 mg/L, 10 days ago: 4.2, 4.0

Hood: TOC = 2.1 mg/L, DOC = 2.0 mg/L, 10 days ago: 2.6, 2.5

 

Daily Average Pumping: 11/26 through 12/4

Banks Pumping Plant ranged between zero cfs and 590 cfs over the period. The 12/4 average was 291 cfs.

Jones Pumping Plant ranged between 924 cfs and 1,767 cfs over the period. The 12/4 average was 1,767 cfs.

Gianelli Pumping Plant discharge generation (San Luis Reservoir water moving out of the reservoir into O'Neill Forebay) ranged between zero cfs and zero cfs over the period. The 12/4 average was zero cfs. Discharge pumping (O'Neill Forebay water moving into San Luis Reservoir) ranged between 484 cfs and 1,464 cfs over the period. The 12/4 average was 484 cfs.

O'Neill Pumping Plant (Federal CVP) discharge generation (O'Neill Forebay water moving into the DMC) varied between zero cfs and zero cfs over the period. The 12/4 average was zero cfs. Discharge pumping (DMC water moving into O'Neill Forebay) ranged between 407 cfs and 901 cfs over the period. The 12/4 average was 407 cfs.

Dos Amigos Pumping Plant ranged between zero cfs and 729 cfs over the period. The 12/4 average was zero cfs.

South Bay Pumping Plant ranged between 164 cfs and 164 cfs over the period. The 12/4 average was 164 cfs.

Barker Slough Pumping Plant ranged between 40 cfs and 40 cfs over the period. The 12/4 average was 40 cfs.

 

 

Status of the Temporary Barriers as of December 3, 2021:

 

This is the last weekly update for the 2021 barrier season.

 

Head of Old River Barrier

The Spring and Fall Head of Old River Barriers were not installed this year.  

 

Middle River Barrier

Construction of the barrier and in-water work started on May 1, 2021.  The installation of the culverts on the north abutment was completed on May 8, 2021.  The barrier was partially closed, and all gates are tied open on May 12, 2021 at 4:45 PM.  The barrier was fully closed, and all gates were released to tidal operation on May 15, 2021 at 10:00 AM.  The in-water installation work was completed on May 15, 2021 at 12:00 PM.  Construction was completed on June 2, 2021 at 3:00 PM.  The crest was not raised by one foot this season.  The barrier was notched on Monday September 13, 2021.  Removal of the barrier started on November 8, 2021 and the barrier was breached on the same day at 10:45 AM.  Complete removal of the barrier was achieved on November 12, 2021.

 

Old River near Tracy Barrier

Mobilization to install the barrier started on May 8, 2021.  The in-water work started on May 10, 2021.  The boat ramp was completed on 5/22/2021.  The barrier was closed on May 27, 2021 at 10:00 AM with one flap gate tied open and the remaining 8 flap gates operating tidally. The remaining flap gate was released on June 1, 2021 at 3:30 PM.  The in-water installation work was completed on May 27, 2021 at 1:00 PM.  Construction was completed on June 3, 2021 at 3:00 PM.  The barrier was notched on Monday September 13, 2021.  Removal of the barrier started on November 9, 2021 and the barrier was breached on the same day at 9:30 AM.  Docks and underwater mats were removed on November 10, 2021 and the boat portage operation ended on the same day.  Complete removal of the barrier was achieved on November 20, 2021.

 

Grant Line Canal Barrier

Mobilization to install the barrier started on May 1, 2021.  The in-water work started on May 3, 2021.  The boat ramp was completed on 5/21/2021.  The barrier was fully closed on May 27, 2021 at 12:30 PM with one flap gate tied open and the remaining 5 flap gates operating tidally. The remaining flap gate was released on June 1, 2021 at 10:30 AM.   The in-water installation work was completed on May 27, 2021 at 12:30 PM.  Construction was completed on June 2, 2021 at 10:00 AMThe adjustment of the flashboard structure at Grant Line Canal Barrier for the passage of adult salmon was completed on Monday September 13, 2021.  Removal of the barrier started on November 13, 2021 and the barrier was breached on the same day at 1:30 PM.  Docks and underwater mats were removed on November 14, 2021 and the boat portage operation ended on the same day.  All in-water work was complete on November 30, 2021.  Complete removal of the barrier was achieved on December 2, 2021 including site clean-up and road repairs.

 

Environmental Compliance

As required by the environmental permits, pre-construction surveys have been conducted in advance of mobilization and construction.  Environmental monitors are present during all phases of construction including the in-water work.  Environmental education was provided to the crew members.  Required discreet turbidity and dissolved oxygen monitoring data were collected during the in-water work phase of the construction.  

 

Water Temperature

Monitoring of water temperature at the San Joaquin River at Mossdale Bridge station (MSD) is being conducted as part of the National Marine Fisheries Service Biological Opinion on Long-term Operations of the Central Valley Project and State Water Project which states, ´┐ŻBarriers would include at least one culvert open to allow for fish migration when water temperatures are less than 71.6.  The daily average temperature at MSD exceeded 71.6 and was observed for three consecutive days on May 29, 30, and 31, satisfying the criteria to release the remaining flap gates to tidal operation.

 

Water Level Modeling

Modeling was conducted for the simulation period from November 30, 2021 through December 20, 2021.  DWR will continue to monitor and report water levels and conditions.

 

Real-time south Delta water level data is available on CDEC at the URL below:

http://cdec.water.ca.gov/river/southdeltaStages.html

 

Water Level Complaints

The following section summarizes an ongoing list of water level complaints received during the year 2021: