The Klamath Basin Monitoring Program (KBMP) evaluated the status and trends for water quality of the Klamath River downstream of Upper Klamath Lake, Oregon to the estuary near Klamath, California, including four major tributaries, for the period between 2009-2016. Two main types of data were assessed: 1) discrete nutrient and related data collected through the Klamath Hydroelectric Settlement Agreement (KHSA) baseline monitoring by participants PacifiCorp, the Karuk and Yurok tribes, and the US Bureau of Reclamation (USBR), and 2) continuous water quality data from a collection of sondes maintained by the Karuk and Yurok Tribes, and the USBR.

The goals of this study were to address three management questions defined by the Klamath Basin Monitoring Program (KBMP) Steering Committee.

• Management Question #1: What is the status of water quality relative to existing regulatory and species and life-stage specific thresholds?
• Management Question #2: What are the trends in water quality conditions and/or impairment longitudinally, across years, and across seasons?
• Management Question #3: What are the key relationships between water quality parameters and how do these parameters drive water quality conditions in the basin?

Final Report