The Washington State Department of Ecology has proposed a permanent change to a state water ­quality rule that limits total dissolved gas, and would allow 125 ­percent saturation under certain conditions in the Snake and Columbia rivers.

Currently, TDG must not exceed an average of 115 percent in the forebays of the next downstream dam and an average of 120 percent in the tailraces of each dam. This spring, under a temporary rule change, both Washington and Oregon allowed TDG to average 120 percent in both forebays and tailraces.

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K.C. Mehaffey covers fish issues for Clearing Up, and is editor of the NW Fishletter. She joined the NewsData writing team in February 2018. From lawsuits to scientific studies, she is enjoying the deep dive into the Columbia Basin's many fish topics.