Current and Historical Delta Smelt Surveys Query

Data Courtesy of California Department of Fish & Wildlife and USFWS Lodi Office

Smelt Queries

Select Output Format

HTML Table with CSV File CSV Only

Select Species, Stratum, Survey

Single year in brackets indicates the earliest year of data. Year range in brackets indicates the available data range for a non-active survey.
Most surveys are updated annually and do not conduct sampling year-round.

Set Date Range

Start Date End Date

Set Fork Length Type

Batch Fork Lengths Individual Fork Lengths

Batch fork length reports min, max, and average lengths (where available) of fish measured in sample.
Individual fork lengths is a subset of Batch and only reports individual fish measured in sample.

Generate Query Result Link Only

Check box and click "Submit Query" button to generate data link for querying results directly from scripts and automated processes.

Query Notes

SacPAS presents historical and current smelt sampling aggregated across numerous surveys based on the current EDSM strata boundaries to illustrate distribution and abundance. SacPAS aggregates multiple sampling efforts with publicly available data and methods, combining their results into a single table for generating displays and analysis.

Smelt Current and Historical Sampling Dates in SacPAS Database
Survey	Min Date	Max Date
Enhanced Delta Smelt Monitoring, USFWS (preliminary)	2025-12-01	2026-11-12
Delta Juvenile Fish Monitoring Program, USFWS	1976-03-09	2026-07-09
Enhanced Delta Smelt Monitoring, USFWS (daily report, preliminary)	2026-03-30	2026-06-04
Salvage, CDFW	1993-01-03	2026-03-06
San Francisco Bay Study, CDFW	1980-01-23	2025-12-11
Fall Midwater Trawl Survey, CDFW	1967-09-12	2025-12-10
Enhanced Delta Smelt Monitoring, USFWS (EDI final)	2016-12-15	2025-11-20
20-mm Survey, CDFW	1995-04-27	2025-07-10
Townet Survey, CDFW	1959-06-16	2025-06-18
Spring Kodiak Trawl, CDFW (discontinued in 2023)	2002-01-07	2023-05-04
San Francisco Estuary Smelt Larva Survey, CDFW	2009-01-23	2023-03-15
Larval Salvage, CDFW (subset of Salvage)	2018-03-31	2022-04-12
Delta Smelt Larval Survey, CDFW	2005-02-02	2006-07-15
North Bay Aqueduct Survey, CDFW	1993-03-07	2004-06-30

Delta Smelt Metadata