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The historical Tualatin River Basin

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https://ir.library.oregonstate.edu/concern/defaults/5q47rt00r

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  • Dionysius said that history is philosophy learned from examples. As one of the original four counties of the Territory of Oregon, the Tualatin River Basin is rich in history. While still a prime agricultural region, the Tualatin Valley is one of the state's fastest developing areas. The slow accumulation of landscape changes within the basin have their origin in the historical needs and lives of the people within the valley. The isolation of the Tualatin River from its floodplain, the draining of wetlands, and the increased urbanization are intertwined with the dreams and efforts of the valley's residents for the last 150 years. The landscape changes, accumulating over time, have had unforeseen consequences. The Tualatin River, once respected for its floods and tortuous channels, was declared "water quality limited" in 1987. Turning back the pages of history, a picture of the pre-contact Tualatin River Basin can provide a point of reference for evaluating the current hydrology of the river. Further, the historical acc;ount provides insight into the needs that fueled the landscape changes. No one set out to create a river too rich in phosphorus and too subject to algal blooms. The philosophy of the original settlers differs little from that of present day inhabitants, only today we understand more about the consequences of the slow accretion of small, individual changes.
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