1. EFFECTS OF IRRIGATION DIVERSION
STRUCTURES ON CHINOOK
SALMON SPAWNING MIGRATION
Ian Wilson1, Shane Vatland1, James Harbeck1 and
Aaron Maxwell2, 1Department of Fisheries Resource
Management, The Freshwater Trust2
5. LOSTINE RIVER RADIO TELEMETRY STUDY
o Monitor migration behavior
o Estimate discharge and passage at
irrigation diversions
o Evaluate distribution relative to arrival
timing
14. RESTORATION OF THE LOSTINE
DIVERSION
o Monitor Chinook salmon passage time before
and after a restoration
o Evaluate discharge and passage events
o Determine passage efficiency
18. DISCUSSION
oNatural and artificial barriers can limit habitat connectivity for
Chinook salmon, although restoration of barriers can result in
increased connectivity
oImproved passage success and reduced passage time increase
the likelihood that fish can reach critical spawning habitat
oArrival timing and flow conditions promote access to spawning
habitat in upper reaches of the Lostine River
19. DISCUSSION
oRadio telemetry data informed managers of habitat restoration
effectiveness and prioritization
oThe explicit relationship between passage time and discharge
needs further exploration
oFish passed diversions at discharge lower than previously
believed, yet this may not reflect the total cost of migrating at
low discharge and elevated water temperatures
