Delta Smelt, Longfin Smelt, and Current Conditions for the Delta Actions Team (DAT)

Downloads: download Daily CSV download Hourly CSV

Daily Conditions for Last 2 Weeks

Operational Indices Daily Data for Last 2 Weeks for select locations and parameters
Date	QWEST (CFS) [DWR]	QWEST 7-day (CFS) [DWR]	JPF (CFS) [DWR]	X2 Position (KM) [DWR]	OMR Index (CFS) [SacPAS]	OMR Index 5-day (CFS) [SacPAS]	OMR Index 14-day (CFS) [SacPAS]	USGS Tidally Filtered OMR (CFS) [USGS]	USGS Tidally Filtered OMR 5-day mean (CFS) [USGS]	USGS Tidally Filtered OMR 14-day mean (CFS) [USGS]	NDOI (CFS) [DWR]	NDOI 3-day (CFS) [DWR]	E/I Ratio 3 day (%) [DWR]	Sum Pumping Discharge HRO+TRP (CFS) [CDEC:HRO+TRP]	Pumping Discharge Harvey O Banks Pumping Plant (CFS) [CDEC:HRO]	Pumping Discharge SJR Tracy Pumping Plant (CFS) [CDEC:TRP]	Pumping Discharge Barker Slough (CFS) [CDEC:BKS]	Pumping Discharge Barker Slough 7-day (CFS) [CDEC:BKS]
Date	QWEST (CFS) [DWR]	QWEST 7-day (CFS) [DWR]	JPF (CFS) [DWR]	X2 Position (KM) [DWR]	OMR Index (CFS) [SacPAS]	OMR Index 5-day (CFS) [SacPAS]	OMR Index 14-day (CFS) [SacPAS]	USGS Tidally Filtered OMR (CFS) [USGS]	USGS Tidally Filtered OMR 5-day mean (CFS) [USGS]	USGS Tidally Filtered OMR 14-day mean (CFS) [USGS]	NDOI (CFS) [DWR]	NDOI 3-day (CFS) [DWR]	E/I Ratio 3 day (%) [DWR]	Sum Pumping Discharge HRO+TRP (CFS) [CDEC:HRO+TRP]	Pumping Discharge Harvey O Banks Pumping Plant (CFS) [CDEC:HRO]	Pumping Discharge SJR Tracy Pumping Plant (CFS) [CDEC:TRP]	Pumping Discharge Barker Slough (CFS) [CDEC:BKS]	Pumping Discharge Barker Slough 7-day (CFS) [CDEC:BKS]
2026-09-29	-3473	-4123	-3350	82	-10260	-10249	-9705	-11300	-11132	-10081	5541	5096	58.7	10729	7150.00	3579.00	65	67
2026-09-30	-4138	-4181	-4002	82	-10935	-10370	-9771	-11550	-11234	-10152	4666	5088	59.4	11465	7150.00	4315.00	73	67
2026-10-01				82	-10196	-10152	-9480	-10770	-11156	-10169				11004	6691.00	4313.00	67	67
2026-10-02					-9568	-10070	-9483	-10700	-11070	-10227				10233	5933.00	4300.00	90	69
2026-10-03					-9528	-9978	-9549	-10180	-10900	-10304				10301	5995.00	4306.00	75	69
2026-10-04					-9013	-9788	-9610	-9490	-10538	-10381				9816	5534.00	4282.00	75	72
2026-10-05					-8905	-9442	-9661	-9310	-10090	-10439				9802	5534.00	4268.00	63	73
2026-10-06					-8383	-9079	-9678	-9240	-9784	-10493				9305	5084.00	4221.00	63	72
2026-10-07					-8402	-8846	-9610	-9330	-9510	-10489				9108	4809.00	4299.00	67	71
2026-10-08					-7926	-8526	-9453	-9320	-9338	-10396				8789	4520.00	4269.00	74	72
2026-10-09					-7045	-8132	-9239	-9250	-9290	-10269				7797	3501.00	4296.00	74	70
2026-10-10					-5724	-7496	-8947	-7460	-8920	-10004				6144	1835.00	4309.00	74	70
2026-10-11					-4534	-6726	-8558							5106	1560.00	3546.00	58	68
2026-10-12					-4032	-5852	-8132							4543	998.00	3545.00	58	67

See Data Notes for details and sources.

Water Quality Daily Data for Last 2 Weeks for select locations and parameters
Date	River Discharge Flow 3-day Freeport (CFS) [CDEC:FPT]	River Discharge Flow SJR nr Vernalis (CFS) [CDEC:VNS]	Rio Vista Flow (CFS) [DWR]	Water Temperature 3-day Jersey Point (C) [CDEC:SJW]	Water Temperature 3-day SR at Rio Vista Br (C) [CDEC:RVB]	Water Temperature Clifton Court (C) [CDEC:CLC]	Water Temperature SJR at Antioch (C) [CDEC:ANH]	Turbidity 3-day Freeport (FNU) [CDEC:FPT]	Water Turbidity 1-day Old River at Bacon Island (USGS) (FNU) [CDEC:OBI]	Water Turbidity 1-day Old River at Franks Tract (FNU) [CDEC:OSJ]	Water Turbidity 1-day SJR Holland Cut (FNU) [CDEC:HOL]
Date	River Discharge Flow 3-day Freeport (CFS) [CDEC:FPT]	River Discharge Flow SJR nr Vernalis (CFS) [CDEC:VNS]	Rio Vista Flow (CFS) [DWR]	Water Temperature 3-day Jersey Point (C) [CDEC:SJW]	Water Temperature 3-day SR at Rio Vista Br (C) [CDEC:RVB]	Water Temperature Clifton Court (C) [CDEC:CLC]	Water Temperature SJR at Antioch (C) [CDEC:ANH]	Turbidity 3-day Freeport (FNU) [CDEC:FPT]	Water Turbidity 1-day Old River at Bacon Island (USGS) (FNU) [CDEC:OBI]	Water Turbidity 1-day Old River at Franks Tract (FNU) [CDEC:OSJ]	Water Turbidity 1-day SJR Holland Cut (FNU) [CDEC:HOL]
2026-09-29	15924.50	699.71	9232	20.58	19.54	22.20	19.94	4.19	1.38	3.18	0.90
2026-09-30	15904.64	769.75	9028	20.52	19.48	22.30	20.11	4.12	1.36	2.38	0.87
2026-10-01	15714.67	777.50		20.58	19.54	22.00	20.22	3.99	1.55	2.90	1.00
2026-10-02	15650.00	842.08		20.68	19.65	21.90	20.28	3.85	0.98	3.50	0.73
2026-10-03	15548.00	925.08		20.80	19.74	22.10	20.50	3.82	0.65	2.81	0.84
2026-10-04	15574.00	1076.40		20.98	19.87	22.30	20.67	3.88	1.03	2.15	1.01
2026-10-05	15299.33	1150.46		21.20	20.04	22.60	20.89	3.82	1.03	2.22	0.91
2026-10-06	14897.67	1180.29		21.44	20.24	22.80	21.06	3.58	0.98	2.36	0.90
2026-10-07	14315.67	1103.42		21.61	20.44	23.00	21.17	3.23	1.00	2.45	1.02
2026-10-08	13765.33	999.29		21.74	20.63	23.00	21.22	2.91	1.22	10.27	1.15
2026-10-09	12957.00	1029.63		21.73	20.74	23.00	21.06	2.77	1.31	2.73	1.26
2026-10-10	12185.00	1081.17		21.56	20.65	22.30	20.67	2.66	1.07	3.42	1.21
2026-10-11	11481.67	1178.04		21.23	20.41	21.40	20.28	2.64	1.24	3.22	1.32
2026-10-12	11150.33	1290.04		20.85	20.02	21.10	19.94	2.59	1.17	3.20	1.27

See Data Notes for details and sources.

Delta Smelt Releases

Delta Smelt releases reported to SacPAS for WY2027
Date	Location	~Days post hatch	Release Method	Adipose Fin Clipped	VIE Tagged	Total Released	Description
2026-06-02	Sacramento River at Sherman Island	120	Fish Transport tank	0%	0%	4000	On 2026-06-02, the USFWS will truck approximately ~4000 brood year 2026 Delta Smelt from the FC&CL to Sacramento River at Sherman Island for release into the Delta. This release will include 0% Adipose fin clipped individuals and 0% Visible Implant Elastomer tagged individuals.
2026-04-03	Sacramento River at Sherman Island	40	Plastic bags	0%	0%	8142	On 2026-04-03, the USFWS will truck approximately ~8142 brood year 2026 Delta Smelt from the FC&CL to Sacramento River at Sherman Island for release into the Delta. This release will include 0% Adipose fin clipped individuals and 0% Visible Implant Elastomer tagged individuals.
2026-04-01	Sacramento River at Sherman Island	40	Plastic bags	0%	0%	34796	On 2026-04-01, the USFWS will truck approximately ~34796 brood year 2026 Delta Smelt from the FC&CL to Sacramento River at Sherman Island for release into the Delta. This release will include 0% Adipose fin clipped individuals and 0% Visible Implant Elastomer tagged individuals.

Summary Tables

Smelt Monitoring Last 2 Weeks

No Delta Smelt or Longfin Smelt caught in monitoring efforts last 2 weeks based on daily EDSM and DJFMP weekly files.

Smelt Monitoring Water Year

No Delta Smelt or Longfin Smelt caught in monitoring efforts WY2027 based on daily EDSM and DJFMP weekly files.

Smelt Salvage Last 2 Weeks

No Delta Smelt or Longfin Smelt caught in SWP and CVP Facilities last 2 weeks. Based on daily retrieval of CDFW Salvage DB.

SacPAS Max Possible Date: 2026-10-11

Smelt Salvage Water Year

No Delta Smelt or Longfin Smelt caught in SWP and CVP Facilities WY2027. Based on daily retrieval of CDFW Salvage DB.

SacPAS Max Possible Date: 2026-10-11

Figures

Water Temperature

Onset of OMR Management

The information on OMR Managment on this website is summarized for Delta Smelt from the OMR Entrainment Management Guidance Document and does not reflect a comprehensive description of each of the OMR actions.

"First Flush" conditions may be triggered between December 1 and January 31 and include: Running 3-day average of the daily flows at Freeport is greater than 25,000 cfs and running 3-day average of the daily turbidity at Freeport is 50 NTU or greater, or real-time monitoring indicates a high risk of migration and dispersal into areas at high risk of future entrainment. This "First Flush" may only be initiated once during the December through January period and will not be required if: spent female Delta Smelt are collected in monitoring surveys.

Turbidity Bridge Avoidance

graph turbidity daily average sacramento san joaquin

Turbidity Bridge Avoidance ("South Delta Turbidity"): After the Integrated Early Winter Pulse Protection (above) or February 1 (whichever comes first) and until a ripe or spent female is detected or April 1 (whichever is first), Reclamation and DWR propose to manage exports in order to maintain daily average turbidity in Old River at Bacon Island (OBI) at a level of less than 12 NTU. Reclamation and DWR recognize that readings at individual sensors or localized groups of sensors can generate spurious results in real-time. To avoid triggering an OMR flow action during a sensor error or a localized turbidity spike that might be caused by local flows or a wind-driven event, Reclamation and DWR will consider and review data from other locations.

Larval and Juvenile Delta Smelt Protection

End of OMR Management

Entrainment Management for Smelts: June 30 or after 3 consecutive days of daily mean water temperature at Clifton Court Forebay (CLC) ≥ 77.0°F (25°C).

Water Temperature Thresholds for End of Smelts Entrainment Management (6/1/2026 - 6/30/2026)
Location	Threshold (°F/°C)	Days Above (n)	3 Consecutive Days Above	Threshold Exceeded Date	Status
Clifton Court [CDEC:CLC]	≥ 77°F / 25°C	7	06/15, 06/16, 06/17, 06/18, 06/19	06/15	Threshold Exceeded

stacked line plot water temperature above below threshold value — Water Temperature Thresholds for End of Smelts Entrainment Management (6/1/2026 - 6/30/2026) at Clifton Court [CDEC: CLC]

Operations and Hydrology

graph Barker Slough temperature and turbidity daily

Water Year Tables

USFWS Chipps Island Trawl

No Delta Smelt or Longfin Smelt caught in Chipps Island Trawl USFWS Lodi juvenile monitoring WY2027.

EDSM

No Delta Smelt or Longfin Smelt caught in Enhanced Delta Smelt Monitoring (EDSM) WY2027.

Salvage at the SWP and CVP Delta Fish Facilities

No Delta Smelt or Longfin Smelt caught in SWP and CVP Facilities WY2027.

Hourly Table

download Daily CSV (all parameters)

Hourly Data for Last 7 Days for select locations and parameters (used in figures)
Date	Hour	River Discharge Flow Old River at Bacon Island (USGS) (CFS) [CDEC:OBI]	River Discharge Flow Old River at Highway 4 (CFS) [CDEC:OH4]
Date	Hour	River Discharge Flow Old River at Bacon Island (USGS) (CFS) [CDEC:OBI]	River Discharge Flow Old River at Highway 4 (CFS) [CDEC:OH4]
2026-10-06	0		-8270.00
2026-10-06	1
2026-10-06	2
2026-10-06	3	-3830.00	-7330.00
2026-10-06	4	4360.00	-2410.00
2026-10-06	5	7650.00	-627.00
2026-10-06	6	7020.00	128.00
2026-10-06	7	5640.00	-769.00
2026-10-06	8	3880.00	-1710.00
2026-10-06	9	2540.00	-2050.00
2026-10-06	10	-273.00	-2230.00
2026-10-06	11	-8540.00	-2380.00
2026-10-06	12		-5970.00
2026-10-06	13		-7840.00
2026-10-06	14
2026-10-06	15
2026-10-06	16
2026-10-06	17	-6510.00
2026-10-06	18	-52.00	-6970.00
2026-10-06	19	3030.00	-1840.00
2026-10-06	20	5740.00	3120.00
2026-10-06	21	5610.00	3650.00
2026-10-06	22	74.00	1330.00
2026-10-06	23		-4910.00
2026-10-07	0		-8100.00
2026-10-07	1		-9960.00
2026-10-07	2
2026-10-07	3
2026-10-07	4	-6360.00	-8210.00
2026-10-07	5	3220.00	-3220.00
2026-10-07	6	7510.00
2026-10-07	7	6350.00	-603.00
2026-10-07	8	5450.00	-871.00
2026-10-07	9	3930.00	-1310.00
2026-10-07	10	2520.00	-1660.00
2026-10-07	11	-2290.00	-2230.00
2026-10-07	12		-4410.00
2026-10-07	13		-7620.00
2026-10-07	14		-8450.00
2026-10-07	15
2026-10-07	16
2026-10-07	17
2026-10-07	18	-2910.00
2026-10-07	19	2100.00	-5520.00
2026-10-07	20	5250.00	1820.00
2026-10-07	21	7500.00	4150.00
2026-10-07	22	6570.00	3120.00
2026-10-07	23	341.00	1360.00
2026-10-08	0		-4190.00
2026-10-08	1		-9790.00
2026-10-08	2
2026-10-08	3
2026-10-08	4
2026-10-08	5	-8080.00	-8610.00
2026-10-08	6	1730.00	-4050.00
2026-10-08	7	6390.00	-1380.00
2026-10-08	8	6200.00	-620.00
2026-10-08	9	5190.00	-928.00
2026-10-08	10	3470.00
2026-10-08	11	1310.00	-1360.00
2026-10-08	12	-6690.00	-2270.00
2026-10-08	13		-6400.00
2026-10-08	14		-8540.00
2026-10-08	15		-8950.00
2026-10-08	16
2026-10-08	17
2026-10-08	18	-6510.00
2026-10-08	19	1200.00	-5910.00
2026-10-08	20	6820.00	1510.00
2026-10-08	21	8550.00	4400.00
2026-10-08	22	8320.00	3730.00
2026-10-08	23	5980.00	2610.00
2026-10-09	0	-1280.00	1070.00
2026-10-09	1		-6630.00
2026-10-09	2
2026-10-09	3
2026-10-09	4
2026-10-09	5
2026-10-09	6	-7920.00	-8540.00
2026-10-09	7	2220.00	-4050.00
2026-10-09	8	6840.00	-814.00
2026-10-09	9	6130.00	296.00
2026-10-09	10	5530.00	215.00
2026-10-09	11	3330.00	67.00
2026-10-09	12	-2490.00	-1200.00
2026-10-09	13		-5170.00
2026-10-09	14		-9740.00
2026-10-09	15		-9830.00
2026-10-09	16
2026-10-09	17		-9960.00
2026-10-09	18		-9240.00
2026-10-09	19	-119.00	-6370.00
2026-10-09	20	6870.00	-338.00
2026-10-09	21	9530.00	3570.00
2026-10-09	22	9100.00	4470.00
2026-10-09	23	8080.00	2820.00
2026-10-10	0	486.00	698.00
2026-10-10	1	-3960.00	-3470.00
2026-10-10	2		-6480.00
2026-10-10	3		-7870.00
2026-10-10	4		-8390.00
2026-10-10	5
2026-10-10	6
2026-10-10	7	-5760.00
2026-10-10	8	1720.00	-5320.00
2026-10-10	9	5580.00	-178.00
2026-10-10	10	6760.00	1310.00
2026-10-10	11	6650.00	3060.00
2026-10-10	12	4570.00	3030.00
2026-10-10	13	-5440.00	-108.00
2026-10-10	14		-7150.00
2026-10-10	15		-8810.00
2026-10-10	16		-8840.00
2026-10-10	17		-9500.00
2026-10-10	18		-9470.00
2026-10-10	19	-2930.00	-7280.00
2026-10-10	20	5500.00	-1340.00
2026-10-10	21	9610.00	3540.00
2026-10-10	22	9950.00	4770.00
2026-10-10	23	9460.00	4600.00
2026-10-11	0	8510.00	3890.00
2026-10-11	1	6230.00	1050.00
2026-10-11	2	-3780.00	7.00
2026-10-11	3	-8740.00	-5270.00
2026-10-11	4		-8000.00
2026-10-11	5		-8710.00
2026-10-11	6
2026-10-11	7
2026-10-11	8	-3940.00	-9970.00
2026-10-11	9	2810.00	-2200.00
2026-10-11	10	8120.00	3550.00
2026-10-11	11	8680.00	4570.00
2026-10-11	12	7280.00	3470.00
2026-10-11	13	868.00	2360.00
2026-10-11	14	-9790.00	-2810.00
2026-10-11	15		-8430.00
2026-10-11	16		-8680.00
2026-10-11	17		-8380.00
2026-10-11	18		-8820.00
2026-10-11	19	-8690.00	-8020.00
2026-10-11	20	2170.00	-4360.00
2026-10-11	21	8960.00	2300.00
2026-10-11	22	10500.00	5140.00
2026-10-11	23	10400.00	5150.00
2026-10-12	0	9160.00	4990.00
2026-10-12	1	8530.00	4420.00
2026-10-12	2	6350.00	3650.00
2026-10-12	3	-3000.00	1920.00
2026-10-12	4		-5430.00
2026-10-12	5		-8190.00
2026-10-12	6		-7500.00
2026-10-12	7		-8440.00
2026-10-12	8	-9290.00	-9140.00
2026-10-12	9	-791.00	-7760.00
2026-10-12	10	2910.00	-1540.00
2026-10-12	11	7100.00	3730.00
2026-10-12	12	7900.00	4120.00
2026-10-12	13	4720.00	2700.00
2026-10-12	14	-4920.00	233.00
2026-10-12	15		-6270.00
2026-10-12	16		-8330.00
2026-10-12	17		-8030.00
2026-10-12	18		-8420.00
2026-10-12	19	-9950.00	-7940.00
2026-10-12	20	-1180.00	-5650.00
2026-10-12	21	6500.00	241.00
2026-10-12	22	10000.00	4320.00
2026-10-12	23	10300.00	5160.00

Data Notes & Resources

Content on this page is updated daily and includes the most up-to-date datasets contained in the SacPAS database.

Smelt Monitoring

The Enhanced Delta Smelt Monitoring Program (EDSM) Weekly Summary, USFWS Lodi. Data are preliminary and are subject to correction and revision.

Smelt Surveys Current and Historical

Current and Historical Delta Smelt Surveys query, HTML table and CSV.

Annually updated Historical Delta Smelt Combined Sampling by Stratum plots removed until further review.

Data Notes

Updates
- 2026-02-09: Jersey Point Water Temperature (CDEC:SJW) 3-day average calculated by SacPAS added to Water Quality Daily Data table.
- 2026-01-09: Jersey Point Flow (JPF) calculated by DWR added to Operational Indices Daily Data table.
- 2025-12-20: Life stage applied to catch and salvage based on fork length and reported in the two week and water year tables.
- As of 2024-12-06, daily averages for CDEC stations and parameters on this webpage, exclusively, are daily averages as published by CDEC. Missing CDEC daily averages are filled by SacPAS from CDEC data where event- or hourly-timescale data are available (using hours 01-24 in local time). A correction to our process was implemented on 2025-01-14.
We obtain Enhanced Delta Smelt Monitoring (EDSM) Provisional data from Delta Juvenile Fish Monitoring Program, USFWS Lodi Office; data are preliminary and are subject to correction and revision. Please see the Environmental Data Initiative (EDI) Portal Interagency Ecological Program and US Fish and Wildlife Service: San Francisco Estuary Enhanced Delta Smelt Monitoring Program data for the finalized dataset.
We obtain salvage data from Fish Salvage Monitoring, CDFW Bay Delta Region
- Salvage Database, https://filelib.wildlife.ca.gov/Public/Salvage/
We obtain Delta Operations (single day and running 30 day reports) from Operations and Delta Status, California Department of Water Resources. SacPAS has archived this data since October 2016.
- "QWEST", "NDOI", "E/I Ratio 3-day", and "Rio Vista Flow" from the Delta Status and Operations, Hydrologic Conditions Summary (daily).
- "X2 Position": Data from the Delta Status and Operations, Delta Operations Summary (daily). For plotting purposes, SacPAS substitutes ">81km" with "82" and "<56km" with "55".
On a daily basis, SacPAS calculates "OMR Index", "OMR Index 5-day", and "OMR Index 14-day" based on methods as described in:
California Department of Water Resources (DWR). 2017. Old and Middle River Flow Review: USGS Gauge Readings versus Index Calculations for 2011 through 2017.
See OMR Tidally Filtered Flow and Index Calculations as performed by SacPAS for full details. SacPAS calculated OMR Index is available for 28 October 2016 to the present.
On a daily basis, we download event, hourly, and daily data from California Data Exchange Center (CDEC) for select parameters and sites for inclusion in the SacPAS database.
We obtain Chipps Island Trawl catch data daily.
Life stage is applied to catch based on fork length (mm).
- Delta Smelt
  - Larva: < 20mm
  - Juvenile: 20-58mm
  - Adult: > 58mm
- Longfin Smelt
  - Larva: < 20mm
  - Juvenile: 20-84mm
  - Adult: > 84mm