Tryon Creek Fish Monitoring
Start Date
3-2-2020 10:00 AM
End Date
3-2-2020 10:10 AM
Abstract
Tryon Creek is a relatively undisturbed urban watershed located in southwest Portland, Oregon. The habitat is well suited for native fish; however, the lower portion of the stream is bisected by a culvert that runs under Oregon State Highway 43. Since 2008, the U.S. Fish and Wildlife Service has worked with the City of Portland to assess the restoration response of fish species in Tryon Creek. Goals are to evaluate fish 1) community, 2) relative abundance, and 3) residence time in the confluence habitat, 4) estimate the population abundance of trout species above the Highway 43 culvert and 5) investigate larval lamprey occupancy. We have found the Tryon Creek confluence supports a community of native fish and their various life stages and migratory salmonids (Chinook Salmon, Coho Salmon, and Steelhead Trout) during their juvenile life history stages. Since 2008, we have conducted seven abundance estimates of the Coastal Cutthroat Trout population above the Highway 43 Culvert. Below the Boones Ferry Road Culvert, we estimate an average of 502 individuals with a density of 0.032 individuals/meter. Above the Boones Ferry Road Culvert and below the Maplecrest Drive Culvert, we estimate an average 92 individuals with a density of 0.028 individuals/meter. Multiple species of Lamprey (primarily larval Pacific Lamprey) have been found using Tryon Creek below the Highway 43 Culvert but not above. Information collected from this assessment will aid the City of Portland in determining if the project is achieving desired function over time and provides a baseline before future culvert replacement takes place.
Subjects
Fisheries
Persistent Identifier
https://archives.pdx.edu/ds/psu/33844
Tryon Creek Fish Monitoring
Tryon Creek is a relatively undisturbed urban watershed located in southwest Portland, Oregon. The habitat is well suited for native fish; however, the lower portion of the stream is bisected by a culvert that runs under Oregon State Highway 43. Since 2008, the U.S. Fish and Wildlife Service has worked with the City of Portland to assess the restoration response of fish species in Tryon Creek. Goals are to evaluate fish 1) community, 2) relative abundance, and 3) residence time in the confluence habitat, 4) estimate the population abundance of trout species above the Highway 43 culvert and 5) investigate larval lamprey occupancy. We have found the Tryon Creek confluence supports a community of native fish and their various life stages and migratory salmonids (Chinook Salmon, Coho Salmon, and Steelhead Trout) during their juvenile life history stages. Since 2008, we have conducted seven abundance estimates of the Coastal Cutthroat Trout population above the Highway 43 Culvert. Below the Boones Ferry Road Culvert, we estimate an average of 502 individuals with a density of 0.032 individuals/meter. Above the Boones Ferry Road Culvert and below the Maplecrest Drive Culvert, we estimate an average 92 individuals with a density of 0.028 individuals/meter. Multiple species of Lamprey (primarily larval Pacific Lamprey) have been found using Tryon Creek below the Highway 43 Culvert but not above. Information collected from this assessment will aid the City of Portland in determining if the project is achieving desired function over time and provides a baseline before future culvert replacement takes place.
