DCC Operations

Part 1: DCC operations by Knights Landing or Sacramento Catch Indices (PA 4-56)
Monitoring period: 1 October-30 November
Water quality criteria per D-1641 are met and either the Knights Landing Catch Index or Sacramento Catch Index is greater than 5.0 fish per day (close until both < 3/day)
Water quality criteria per D-1641 are met, either Knights Landing Catch Index or the Sacramento Catch Index are greater than 3.0 fish per day but less than or equal to five fish per day. (closed for 3 days)

Alerts: Deer Creek, Mill Creek, Wilkins Slough, Knights Landing

Monitor Deer Creek and Mill Creek for average daily flow >95 cfs or >50% change from prior day

Monitor for both conditions: Wilkins Slough average daily flow >7500 cfs and Knights Landing temperature <56.3F

Juvenile Sampling

Juvenile Sampling Summary for 12/15/2024-12/21/2024 (last 7 days) and 12/08/2024-12/14/2024 (previous 7 days)

• Butte Creek Diversion and RST: Preliminary data from CDFW via CalFish; subject to revision.
• Tisdale Weir RST: Preliminary data from CDFW via CalFish and CDEC; subject to revision.
• Knights Landing RST: Preliminary data from CDFW via CalFish and CDEC; subject to revision. Turbidity is a discrete measure. KNL measured in FTU which should be roughly equivalent to NTU.
• Lower Feather River RST: Preliminary data from CDFW via CalFish; subject to revision.
• Lower Sacramento River RST: Preliminary data from CDFW via CalFish; subject to revision.
• Sacramento Trawls (@ Sherwood Harbor): Preliminary data from USFWS Lodi and CDEC; subject to revision.
• Sacramento Beach Seines: Preliminary data from USFWS Lodi and CDEC; subject to revision.
• Chipps Island Trawls: Preliminary data from USFWS Lodi and CDEC; subject to revision.
• Mossdale Trawls: Preliminary data from USFWS Lodi and CDEC; subject to revision.
• Averages: calculated for all non-null data points within the 7 day reporting period.

Historical Migration Pattern for "Today"

Species Distribution Estimates

Estimates presented during weekly meetings. Submitted by BOR to SacPAS after weekly meetings for generation of plots.

Delta STARS Estimates

Current estimates generated by the Delta STARS tool. STARS Predicted Survival, Travel-Time and Routing for Late-Fall Run and Winter Run Chinook. Delta STARS developed by USGS Quantitative Fisheries Ecology Section and deployed by SacPAS.

Loss&Salvage Predictor Estimates

Current estimates generated by the Loss and Salvage Predictor tool. Predicts loss and/or salvage of endangered steelhead and winter run Chinook salmon at the CVP and SWP pumping facilities at the southern end of the Sacramento-San Joaquin Delta. Available Decemer to mid-June.

Single-Year Loss Thresholds

Single-Year Loss Thresholds (PA 4-69)

In each year, typically January/February, Reclamation and DWR propose to avoid exceeding an annual loss threshold equal to 90% of the greatest annual loss that occurred in the historical record 2010-2018 for each of:

• Natural Winter-Run Chinook Salmon (loss= 1.17% of JPE)
• Natural Central Valley Steelhead from December through March (loss = 1,414)
• Natural Central Valley Steelhead from April through June 15 (loss = 1,552)

Loss Summary Table

Natural Winter-Run Chinook Salmon Loss Figures

Natural Central Valley Steelhead Loss Figures

Daily Loss Table

Data Notes

Content on this page is updated daily during the monitoring season and includes the most up-to-date datasets contained in the SacPAS database. Juvenile monitoring and salvage data are updated as made available publicly.

1. 2019 Biological Opinions, USBR includes link to "Chapter 4 Proposed Action" PDF
2. Water condtions data courtesy of CDEC.
3. Knights Landing RST and Tisdale RST data courtesy of CDFW via StreamNet.
   • The Knights Landing RST: uses Frank Fisher length-at-date model to categorize Chinook into "older" and "fry/smolt".
4. Sacramento Trawls, Sacramento Beach Seines, Chipps Island Trawls, and Mossdale Trawls sampling data courtesy of USFWS Lodi weekly.
   • Sacramento Beach Seines: Verona, Elkhorn, Sand Cove, Miller Park, Sherwood Harbor, Discovery Park, American River, Garcia Bend.
   • 30 November 2020: Sampling at Mossdale Trawls stopped; sampling at the sites deemed "non-essential" during COVID-19 response.
5. Salvage data courtesy of Fish Salvage Monitoring, CDFW Bay Delta Region
   • Salvage Database, ftp://ftp.dfg.ca.gov/salvage/
   • We use loss estimation methods as detailed in "Chinook Salmon Loss Estimation for Skinner Delta Fish Protective Facility and Tracy Fish Collection Facility, 7/9/2018" ftp://ftp.wildlife.ca.gov/salvage/Salmon%20loss%20estimation.docx

• Juvenile Monitoring & Sampling data queries
• Juvenile Salvage & Loss data queries
• Loss and Salvage Predictor real-time forecasts from approximately December to mid-June