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2023 Winter-run Chinook Data file |
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This file contains updates of the 2023 Winter-run population in the upper Sacramento River. It is updated weekly, or as needed. Updates to carcass counts, aerial redd counts and shallow water redd counts are provided. Data contained within is draft and has not undergone final review or analysis and may change based upon these later reviews. Questions or needs concerning the data in this file can be addressed to Doug Killam at doug.killam@wildlife.ca.gov.
“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”.
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All Items File size 3000 K DOWNLOAD
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Salmonid Populations of the Upper Sacramento River Basin In 2021 |
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Population sizes were estimated for Chinook Salmon and steelhead (where possible) passing upstream of Princeton, CA in the upper Sacramento River basin (USRB). Annual population estimates for the USRB were determined through several methodologies including carcass surveys, hatchery counts, aerial and in-stream redd surveys, snorkel counts, angler interviews, video stations, DIDSON (acoustic sonar) or Vaki Riverwatcher counts in streams and in fish ladders.
The numbers of spawning salmon in the USRB were below average in 2021. Since 2000, spawner counts have averaged 143,600. The 2021 spawner count of 91,739 was higher than 2017’s record low of 18,195 but was still well below the average for years 2000-2021. The winter of 2019-2020 was very dry and the watershed continued to experience critically dry, drought conditions for a second straight year during the 2020-2021 rainy season. The resulting low snowpack and generally low flows caused water levels in Lake Shasta to shrink and concern for water availability for 2021 and into 2022 was again a cause for much concern in the watershed and throughout California.
In 2021, there were an estimated 101,192 mature Chinook Salmon returning to the USRB that passed upstream of Princeton Ferry (includes angler catch). This includes an estimate of 4,304 late-fall-run, 10,551 winter-run, 3,620 spring-run, and 82,717 fall-run Chinook Salmon (Table 1). The majority (92%) of these salmon migrated above the Red Bluff Diversion Dam (RBDD) to spawn in the tributaries or the Sacramento River upstream of Red Bluff. Additionally, 2,875 steelhead (Rainbow Trout greater than 16 inches long) were counted during monitoring operations for the 2020-2021 steelhead reporting year.- revised 5-12-23
“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.”
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All Items File size 767 K DOWNLOAD
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Salmonid Populations of the Upper Sacramento River Basin In 2021 Data Supplement |
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This file contains data spreadsheets to be used as supplements for interested readers to the accompanying 2021 Annual pdf text report. Population sizes were estimated for Chinook Salmon and steelhead (where possible) passing upstream of Princeton, CA in the upper Sacramento River basin (USRB). Annual population estimates for the USRB were determined through several methodologies including carcass surveys, hatchery counts, aerial and in-stream redd surveys, snorkel counts, angler interviews, video stations, DIDSON (acoustic sonar) or Vaki Riverwatcher counts in streams and in fish ladders. The data in this file can change at any time based on updates or new information.-revised 5-12-23
“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.”
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All Items File size 1492 K DOWNLOAD
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