Salmonids, Steelhead, and Current Conditions for the Delta Actions Team (DAT)

DCC Operations

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

Summary Last Two Weeks

• 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"

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. The 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.

For model details and calibration methods see Tillotson et al. (2022).

Tillotson MD, Hassrick J, Collins AL, Corey P. 2022. Machine Learning Forecasts to Reduce Risk of Entrainment Loss of Endangered Salmonids at Large-Scale Water Diversions in the Sacramento-San Joaquin Delta, California. San Francisco Estuary and Watershed Science.

Current Conditions

OMRI Scenarios

Spring Surrogates

No 2027 CWT Spring Surrogate Releases.

Single-Year Loss Thresholds

Single-Year Loss Thresholds

• Natural Winter-Run Chinook Salmon (loss threshold = 10575; 1.0% of JPE)
• Hatchery Winter-Run Chinook Salmon, releases from Livingston Stone NFH (loss threshold = 1301; 1.0% of JPE)
• Natural Central Valley Steelhead (loss = 5294; Incidental Take Limit (ITL) in 2024 NMFS BiOp)
• Hatchery Central Valley Steelhead (loss threshold is 1% of JPE based on estimated survivals using forecasted water year types and hatchery releases to-date)

Loss Summary Table

Natural DNA Winter-Run Chinook Salmon Loss Figure

Natural LAD Winter-Run Chinook Salmon Loss Figures

LSNFH Hatchery CWT Winter-Run Chinook Salmon Loss Figure

LSNFH Hatchery CWT Winter-Run Chinook Salmon Releases

No for Water Year 2027.

Natural Central Valley Steelhead Loss Figures

Hatchery Central Valley Steelhead Loss Figure

Hatchery Central Valley Steelhead Releases and JPE

No Water Year 2027 Steelhead Hatchery Releases.

Daily Loss Table

Entrainment Management

Entrainment Management for Salmonids: June 30 or after 7 days of daily mean water temperature in June ≥ 72°F (22.2°C) at Mossdale and at Prisoner’s Point (does not have to be consecutive).

Water temperature monitoring for the end of entrainment management starts 6/1/2027.

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. Long-Term Operation of the Central Valley Project and State Water Project, Bay-Delta Office, USBR
2. Action 5 Record of Decision, Action 5, Operation Plan for the Central Valley Project and State Water Project, USBR
   • 5.3.2 Real-Time Assessment Thresholds, pg 5-9, Action 5 ROD Attachment 1 Exhibit 1
3. Water conditions data courtesy of CDEC.
4. 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".
5. 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.
6. 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