File Geodatabase Feature Class
Tags
Striped Bass, Delta Smelt, pod, salinity, temperature, temp, ec, secchi, Townet, Summer Townet, TNS, biota, environment, Delta, San Francisco Estuary, San Joaquin River, Lower Sacramento River, Suisun Bay, San Pablo Bay, Montezuma Slough, Carquinez Straits, Grizzly Bay, Honker Bay, Napa River, North Delta, East Delta, South Delta, California
The Townet Survey (TNS) was started to evaluate major water diversions in relation to the California fishery for striped bass (Calhoun, 1953) and more recently delta smelt. The data collected from survey stations is used by various agencies and consultants for water quality evaluations in the upper San Francisco Estuary analyzed by biologists for long term monitoring. The TNS was started to evaluate major water diversions in relation to the California fishery for striped bass (Calhoun, 1953) and more recently delta smelt.
The Townet Survey consists of 6 biweekly surveys (since 2003) that sample 37 stations in the San Francisco Estuary with up to three, ten-minute, oblique tows. The TNS samples from eastern San Pablo Bay to Rio Vista on the Sacramento River and Stockton on the San Joaquin River. From 1959 to 2002, two to five surveys were completed each year. In 2003 it was standardized to six surveys every year. General station location descriptions sampled by the TNS are: San Pablo Bay = 323, 328, 329, 334, 335, 336; Napa River = 340; West Suisun = 405, 411, 418, 501; Grizzly Bay = 602; Montezuma Slough = 606, 609, 610; East Suisun = 504, 508, 513, 519, 520; Lower Sacramento River = 704, 706, 707, 711; North Delta = 919; Lower San Joaquin River = 801, 804, 809, 812, 815, 902, 906; South Delta = 910, 912, 914, 915, 918. The data collected at the stations represents young of the year pelagic fish captured at a station in relation to various environmental conditions (temp, salinity, clarity, and waterflow) throughout the San Francisco Estuary. Records come from fixed stations from San Pablo Bay to Stockton on the San Joaquin River and the tip of Grand Island in the Sacramento River. The data set began from 1959 to present time by the Department of Fish and Game in the Upper San Francisco Estuary. No survey was completed in 1966. The TNS abundance index is calculated from 32 core stations. From 1959 to 1997, the number of surveys completed was variable, sometimes starting when striped bass averaged 1 inch in the SJ River at Antioch. From 1998 to 2002, sampling typically began about the 3rd or 4th week of June. Since 2003, the TNS begins the 1st and 2nd week in June.
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Extent
| West | -122.353258 | East | -121.362175 |
| North | 38.177153 | South | 37.846672 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.