Lamprey are uniquely important to the five Tribes who are members of the Portland Harbor Natural Resource Trustee Council. The Willamette River is one of the few remaining locations where Tribal members can harvest these fish, which provide subsistence and sustain vital ceremonial activities. However, contamination has deprived many Tribal members of opportunities to eat lamprey, while those who are able to obtain lamprey enjoy their meals less due to concerns about contamination. Tribal members also worry that giving lamprey to others – including children and elders – may harm their health because of contamination.
Restoration projects currently being built and maintained along the Willamette River offer a unique opportunity to gain additional information about the population and health of lamprey in the Willamette River and the river-bottom habitats with which lamprey ammocoetes (larvae) are associated. The restoration projects are creating off-channel habitat, restoring shoreline habitat, and establishing native vegetation. To gain information about lamprey in these restored areas, project developers are providing financial support to the U.S. Fish and Wildlife Service (FWS) to conduct lamprey monitoring, with additional resources provided by FWS. Monitoring occurs at each project site, including Alder Creek, the Rinearson Natural Area, and Linnton Mill, and the Portland General Electric (PGE) Harborton site.
Ultimately, FWS, the project developers, and the five Tribes hope that the information generated by this monitoring program can inform future restoration efforts to benefit lamprey more specifically. FWS has documented the results of lamprey monitoring efforts in a series of annual reports. The reports are available in the Trustee Council's Administrative Record
here. Use search terms "larval pacific lamprey" to view the reports from 2014-2020.