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Late winter 1992 sampling for water quality in three stream segments of the Tualatin River Basin, Oregon

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https://ir.library.oregonstate.edu/concern/defaults/p2677038j

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  • The Tualatin River Basin in Washington County, Oregon has been identified by the Oregon Department of Environmental Quality (DEQ) as "Water Quality Limited." Algal blooms have become commonplace in the lower , reaches of. the river during summer months. Phosphorus has been identified as the nutrient upon which to base allowable Total Maximum Daily Loads (fMDL}. Water quality data have been collected from the Tualatin River and its tributaries for the period of May through October for each of the past several years. Samples from the main stem of the river have also been collected during the winter months on a less frequent basis. There are very few data, however, from the tributaries for the winter months. This study was planned to collect water samples from three of the Tualatin River tributaries during the months of March and April, 1992. These tributaries were selected to represent the three major land uses within the basin: urban, agricultural, and forestry. Weekly samples were taken from Dairy, McKay, and Fanno Creeks. Multiple samples were collected on each sampling date to establish the extent to which short term variability would affect interpretation of the results. Total (TP) and orthophosphate (OP) concentrations on the East and West Fork of Dairy creek were essentially constant over time and sampling site; averaging 0.05 and 0.02 mg/1 respectively. McKay Creek samples showed 0.01 mg/1 OP, with TP increasing from 0.02 to 0.045 mg/1 downstream. The values did not change with time. The Dairy Creek samples showed 0.025 OP and 0.065 TP, constant with sampling time. Fanno Creek had average values of 0.035 OP and 0.09 TP, which increased with time, but were constant across sampling sites. Total solids and suspended solids were highest in Fanno Creek and lowest in McKay Creek. Suspended solids decreased downstream in Fanno Creek, and total solids increased for McKay Creek. Flow responded to rainfall, but no erosion events were recorded during this sampling period.
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