Endangered Species Act Status Review for Upper Klamath and Thrinity River Chinook Salmon

January 01, 2013

The 2013 Status Review Report Conducted on a Petition to list under the U.S. Endangered Species Act both spring-run and fall-run Chinook salmon in the Upper Klamath and Trinity Rivers (UKTR) Chinook Salmon Evolutionarily Significant Unit (ESU)

In response to a petition to list under the U.S. Endangered Species Act both spring-run and fall-run Chinook salmon in the Upper Klamath and Trinity Rivers (UKTR) Chinook Salmon Evolutionarily Significant Unit (ESU) the National Marine Fisheries Service (NMFS) Southwest Fisheries Science Center convened a Biological Review Team (BRT) to evaluate new information they determined to be most relevant to the questions of ESU configuration and status. This included information provided by the Petitioners in their petition, information deemed pertinent by the BRT, and information provided to the NMFS Southwest Regional Office by other parties interested in this issue. The purpose of this Technical Memorandum is to document the BRT’s review and analysis of this information and to report their findings. Most importantly, the BRT concluded that the new information supported the existing UKTR Chinook ESU configuration with springrun and fall-run populations included in a single ESU, and that the ESU is currently at a low risk of extinction within the next 100 years.

Last updated by Office of Protected Resources on 06/28/2018

Endangered Species Act