Does agricultural land use or city impact have a greater affect on phosphorus levels?
Oral Glencoe High School, Hillsboro, OR Linda Wolf Sample water was taken from Dairy Creek and the Willamette River and tested for phosphorous. Amount of agricultural land use located on the surrounding banks and amount of direct impact by city developments was assessed for each water way. The result of phosphorus testing was compared from each water source. A comparison of dissolved oxygen, temperature, & pH levels from the last 15 years in West Fork Dairy Creek Poster Glencoe High School, Hillsboro, OR Linda Wolf Have the levels of DO, pH, and temperature been consistent in the history of the West Fork Dairy Creek? Dissolved oxygen levels hit a low in the years of 1994-1996, but followed a normal trend in the following years. The rapid fall of DO could be related to the spike in Temperature those years. The cause of the temperature spike is unknown, but could be related to lack of stream flow, lack of shading, and higher air temperatures. Our data shows that there has been a signific
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