San Joaquin River Restoration Project

Chinook Salmon Spawning Studies

USFWS and CDFW biologists surveying a Chinook Salmonredd in the San Joaquin River Restoration Area. USFWS photo

USFWS and CDFW biologists surveying a
Chinook Salmon redd in the San Joaquin River
Restoration Area. USFWS photo.

Since 2013, the USFWS Lodi Field Office and the California Department of Fish and Wildlife (CDFW) have conducted seasonal spawning studies of experimental populations of Chinook Salmon released into the upper reaches of the San Joaquin River Restoration Area (SJRRA). The data collected during these studies are used to assess the status and quality of spawning habitat and to identify spawning habitat restoration needs before volitional fish passage is restored to the upper SJRRA.


Fry-emergence trapused to assess juvenile production of Chinook Salmonin the San Joaquin River Restoration Area.

Fry-emergence trap used to assess
juvenile production of Chinook Salmon in
the San Joaquin River Restoration Area.
USFWS Photo.

Our collaborative team uses a number of methods to assess Chinook Salmon reproduction in the upper reaches of the SJRRA including:annual redd and carcass surveys, fry emergence traps, and tracking of adults with acoustic monitoring. Data collected from these activities are then analyzed by our staff in order to assess the spatial and temporal distribution of reproduction, evaluate the quality of spawning habitat,and assess overall reproduction success.

File Size Report Title Year Format
1.37MB 2013-2014 Fall-run Chinook Salmon Spawning Assessment within the San Joaquin River, California 2016 PDF
1.39MB 2015 Fall-run Chinook Salmon spawning assessment within the San Joaquin River, California 2016 PDF