Klamath River Water Quality Data from Link River Dam to Keno Dam, Oregon, 2008

Abstract

This report documents sampling and analytical methods and presents field data from a second year of an ongoing study on the Klamath River from Link River Dam to Keno Dam in south central Oregon; this dataset will form the basis of a hydrodynamic and water quality model. Water quality was sampled weekly at six mainstem and two tributary sites from early April through early November, 2008. Constituents reported herein include field-measured water-column parameters (water temperature, pH, dissolved oxygen concentration, specific conductance); total nitrogen and phosphorus; particulate carbon and nitrogen; total iron; filtered orthophosphate, nitrite, nitrite plus nitrate, ammonia, organic carbon, and iron; specific UV absorbance at 254 nanometers; chlorophyll a; phytoplankton and zooplankton enumeration and species identification; and bacterial abundance and morphological subgroups. Sampling program results indicated: • Most nutrient and carbon concentrations were lowest in spring, increased starting in mid-June, remained elevated in the summer, and decreased in fall. Dissolved nitrite plus nitrate had a different seasonal cycle and was below detection or at low concentration in summer.

Generalized regression neural network-based approach for modelling hourly dissolved oxygen concentration in the Upper Klamath River, Oregon, USA

“…[18] These problems mean that the Oregon Department of Environmental Quality will need to prepare a plan, or a total maximum daily load, to bring the river back into compliance with water quality standards. [19,20] In this study, one data-set was used. The GRNN and MLR models were developed and tested using hourly experimental data collected from the USGS (Station No: [top], latitude 42 • 12 09 , longitude 121 • 46 30 ) station at the Klamath River at RR Bridge at Lake Ewauna, Oregon, USA ( Figure 1).…”