Excerpt from Biological Investigations of the Fishery Resources of Trinity River, California

Almost without exception, Trinity River salmon migrating above the South Fork spawn in the 72 miles of river between the North Fork and Ramshorn Creek. In addition to the main river, three tributaries are used by spawning salmon. A dam at the Lewiston site would cut off 35 miles of the main river and all of Stuart Fork, the most important spawning tributary. The salmon would be blocked from approximately 50 percent of their natural spawning grounds in the upper Trinity. A dermat the Browns Creek site would cut off the remaining two spawning tributaries and 59 miles of the main river spawning area. This dam 'would eliminate some 82 percent of the natural salmon spawning area.

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