Park officials are installing barriers in front of boat launches in an attempt to prevent invasive mussels recently discovered in Montana from spreading to the park and into the Columbia River Basin.
Fish could face a potentially lethal problem in spillways at dams where increased nitrogen in the water can cause tissue-damaging gas bubble trauma.
The restoration work includes adding 3,000 miles of spawning and rearing habitat as well as 14 square miles of estuary habitat where young fish prepare to enter the ocean.
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