4/20/2021

10 Day Northern California Precipitation Forecast: 2% chance of precipitation today, 3% tomorrow, 1% on 4/22, 1% on 4/23, 24% on 4/24, 31% on 4/25, 41% on 4/26, 24% on 4/27, 14% on 4/28, and 18% on 4/29

 

From CDEC: Precipitation to date for water year 2020-2021 - As of 4/20/2021:

Northern Sierra Precipitation Index: 22.4" = 49% of average for this date

San Joaquin Precipitation Index: 17.7" = 50% of average for this date

Tulare Basin Precipitation Index: 9.4" = 37% of average for this date

 

From CDEC: Average statewide snow water equivalents as of 4/20/2021:

North: 7.8" = 33% of normal for this date

Central: 10.9" = 40% of normal for this date

South: 3.7" = 17% of normal for this date

Statewide: 8.1" = 32% 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 4/19 daily average reported 6,904 cfs and may increase to 7,425 cfs by 4/25.

Feather River (at Boyd's Landing)

The Feather is currently reporting at 1,879 cfs and is expected to increase to 2,797 cfs by 4/24 then begin to decrease.

San Joaquin River (near Vernalis)

The San Joaquin is reporting 1,727 cfs and is expected to decrease to 776 cfs on 4/23 then increase to 1,062 cfs on 4/24.

 

Delta Cross Channel Gate Operation (From the USBR website)

Posted: 11/25/2020

Delta Cross Channel Gates will OPEN on Wednesday November 25, 2020 at approximately 1000 hrs.

Delta Cross Channel Gates will CLOSE on Tuesday December 1, 2020 at approximately 1000 hrs.

Gates will remain closed until further notice.

Comment: Dec 1 seasonal closure.

PLEASE 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)

SJR flow is going to increase so EC and bromide should be decreasing at Vernalis. The station seems to have shut down over the weekend. Nothing is reporting right now. No major changes at any of the other stations. The anion analyzer at Jones is operational and we thought it would be reporting as of Friday, but it isn�t. Waiting to hear what the issue is. Gianelli also went down unexpectedly on 4/11. Everything was restarted including the anion analyzer, but we are working on a calibration issue.

Banks: EC - 703 uS/cm, Br - 0.36 mg/L, 10 Days ago: 691 uS/cm and 0.34 mg/L

Jones Daily Average: EC - 697 uS/cm, 10 days ago: 784 uS/cm,

Clifton Court Forebay Daily Average: EC - 734 uS/cm, 10 days ago: 723 uS/cm

Vernalis: EC 615 uS/cm, (Est.) Br - 0.25 mg/L, 10 days ago: 812 uS/cm and Br 0.34 mg/L

Gianelli: EC - 533 uS/cm, (Est.) Br 0.27 mg/L, 10 days ago: 538 uS/cm and ?

Hood: EC - 171 uS/cm, 10 days ago: 189 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

No major changes. �

Banks: TOC = 6.4 mg/L, DOC - 6.0 mg/L 10 days ago: 6.7, 6.1

Jones: TOC = 6.5 mg/L, (Est.) DOC - 6.4 mg/L 10 days ago: 5.8, 5.7

Vernalis: TOC = 2.7 mg/L, DOC = 2.7 mg/L 10 days ago: 3.8, 3.5

Gianelli: TOC = 3.2 mg/L, DOC = 3.1 mg/L 10 days ago: 3.3, 3.2

Hood: TOC = 1.8 mg/L, DOC = 1.7 mg/L 10 days ago: 1.9, 1.8

 

Daily Average Pumping: 4/9 through 4/18

Banks Pumping Plant ... ranged between 300 cfs and 407 cfs over the time period. The 4/18 average was 300 cfs.

Jones Pumping Plant ... ranged between 802 cfs and 809 cfs over the time period. The 4/18 average was 806 cfs.

Gianelli Pumping Plant ... discharge generation (San Luis Reservoir water moving out of the reservoir into O'Neill Forebay) ranged between 626 cfs and 2,112 cfs over the time period. The 4/18 average was 1,168 cfs. Discharge pumping (O'Neill Forebay water moving into San Luis Reservoir) ranged between zero cfs and zero cfs over the time period. The 4/18 average was zero cfs.

O'Neill Pumping Plant (Federal CVP) ... discharge generation (O'Neill Forebay water moving into the DMC) varied between 124 cfs and 397 cfs over the time period. The 4/18 average was 124 cfs. Discharge pumping (DMC water moving into O'Neill Forebay) ranged between 17 cfs and 392 cfs over the time period. The 4/18 average was 110 cfs.

Dos Amigos Pumping Plant ... ranged between 468 cfs and 1,690 cfs over the time period. The 4/18 average was 468 cfs.

South Bay Pumping Plant ... ranged between 206 cfs and 354 cfs over the time period. The 4/18 average was 234 cfs.

Barker Slough Pumping Plant ... ranged between 71 cfs and 109 cfs over the time period. The 4/18 average was 106 cfs.

This is the first Weekly Update for the 2021 Temporary Barriers Project.

Status of the Temporary Barriers as of March 11, 2021:
DWR has all necessary permits and approvals in place and plans to start construction of the agricultural barriers Middle River, Grant Line Canal, and Old River at Tracy Barriers on May 1, 2021.

Head of Old River Barrier
DWR does not plan to construct the Spring or Fall Head of Old River Barrier this year.  

Environmental Compliance
As required by the environmental permits, pre-construction surveys will be conducted in advance of construction.  Environmental monitors will be present during all phases of construction including the in-water work.  Environmental education will be provided to the crew members.  Required discreet turbidity and dissolved oxygen monitoring data will be 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) will be 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, Barriers would include at least one culvert open to allow for fish migration when water temperatures are less than 71.6F (22C).

Water Level Modeling
Modeling was conducted for the simulation period from March 9, 2021 through March 29, 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
We have established an e-mail address, SDWAComplaint@water.ca.gov, to receive and distribute water level complaints to the appropriate DWR staff.  Please use this e-mail address specifically designated for South Delta water level complaints.  To help us determine the response and the appropriate follow up, please provide the following information in your water level complaint e-mail:

All complaints need to provide the information requested in the first three bullets.

Please note that the information provided in the complaint e-mail will be used to evaluate the situation and to act as appropriate.  For the Temporary Barriers Project, this information is critical as water level complaints are used as a necessary justification to request approval from fishery agencies to fully close the Grant Line Canal barrier, release the flap gates to a tidal operation, and to raise the crest of the Middle River barrier by additional one foot.