Delta Smelt Metadata
| Survey | Min Date | Max Date |
|---|---|---|
| Delta Juvenile Fish Monitoring Program, USFWS | 1976-03-09 | 2026-02-17 |
| Enhanced Delta Smelt Monitoring, USFWS (preliminary) | 2022-12-07 | 2026-02-10 |
| Salvage, CDFW | 1993-01-03 | 2025-05-22 |
| Fall Midwater Trawl Survey, CDFW | 1967-09-12 | 2024-12-16 |
| San Francisco Bay Study, CDFW | 1980-01-23 | 2024-12-11 |
| 20-mm Survey, CDFW | 1995-04-27 | 2024-07-10 |
| Townet Survey, CDFW | 1959-06-16 | 2024-06-04 |
| Enhanced Delta Smelt Monitoring, USFWS (daily report, preliminary) | 2024-04-03 | 2024-05-23 |
| San Francisco Estuary Smelt Larva Survey, CDFW | 2009-01-05 | 2024-03-22 |
| Spring Kodiak Trawl, CDFW (discontinued in 2023) | 2002-01-07 | 2023-05-04 |
| Enhanced Delta Smelt Monitoring, USFWS (EDI final) | 2016-12-15 | 2022-11-29 |
| Larval Salvage, CDFW (subset of Salvage) | 2018-03-31 | 2022-04-12 |
| Delta Smelt Larval Survey, CDFW | 2005-01-31 | 2006-07-15 |
| North Bay Aquaduct Survey,CDFW | 1993-03-07 | 2004-06-30 |
SacPAS Process and Stratum Assignment
SacPAS downloads the survey datasets from their various online sources and imports them into the SacPAS database. Updates are acquired as they become available: EDSM, DJFMP sampling, and Salvage data are updated daily and the other surveys are updated annually. Unique site identifiers for all sites across the surveys are conflated. Site IDs with multiple names or descriptions but the same location were standardized with multiple, nearby Lat-Lon values averaged to eliminate duplicate entries. YY-DD prefixes on EDSM station codes are removed. The unique sites are located on a map with positions compared to the strata boundaries of the EDSM dataset. Each unique site was assigned their appropriate EDSM stratum based on their mapped location.
SacPAS presents historical and current smelt sampling aggregated across numerous surveys based on the current EDSM strata boundaries to illustrate distribution and abundance. The evolving nature of EDSM strata over the years causes some confusion with appropriate assignment, especially in the Cache Slough and Deep Water Shipping Channel strata. As a result, most EDSM data sites retain their original strata designations except the EDSM risk/density strata are assigned by location. The SWP and CVP Salvage facilities in the South Delta are assigned their own stratum: "Salvage".
Information Pages
- Bay-Delta Studies and Surveys, CDFW
- Fish Salvage Monitoring, CDFW Bay Delta Region
- Interagency Ecological Program (IEP) Monitoring Programs Information pages
Data Sources
- 20-mm, Delta Smelt Larval Survey, North Bay Aquaduct Survey, Spring Kodiak Trawl, and San Francisco Estuary Smelt Larva Survey, CDFW
- Enhanced Delta Smelt Monitoring, Interagency Ecological Program and US Fish and Wildlife Service: San Francisco Estuary Enhanced Delta Smelt Monitoring Program data for the finalized dataset
- Fall Midwater Trawl Survey, CDFW
- Salvage Database, CDFW
- San Francisco Bay Study, CDFW
- San Francisco Estuary Smelt Larva Survey, Interagency Ecological Program, EDI Portal
- Townet Survey, CDFW