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In this photo taken Tuesday, April 15, 2014, fisheries biologists Jenni Whitney, left, and Pete Verhey wade into Squire Creek, a tributary of the North Fork of the Stillaguamish River, as they search for salmon spawning nests near Darrington, Wash. Finding the nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)

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In this photo taken Tuesday, April 15, 2014, fisheries biologist Pete Verhey looks for evidence of fish eggs as he wades in Squire Creek, a tributary of the North Fork of the Stillaguamish River, near Darrington, Wash. Finding a spawning nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)

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In this photo taken Tuesday, April 15, 2014, fisheries biologist Pete Verhey looks for evidence of fish eggs as he wades nearly waist-deep in Squire Creek, a tributary of the North Fork of the Stillaguamish River, near Darrington, Wash. Finding a spawning nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)

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In this photo taken Tuesday, April 15, 2014, fisheries biologists Jenni Whitney, left, and Pete Verhey take a brief break after wading through Squire Creek, a tributary of the North Fork of the Stillaguamish River, while searching for salmon spawning nests near Darrington, Wash. Finding the nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)

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In this photo taken Tuesday, April 15, 2014, fisheries biologist Pete Verhey replaces his GPS unit after marking the location of a salmon spawning nest in Squire Creek, a tributary of the North Fork of the Stillaguamish River, near Darrington, Wash. Finding the nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)

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In this photo taken Tuesday, April 15, 2014, a fish biologist displays an old tag that marked a previous salmon spawning nest in Squire Creek, a tributary of the North Fork of the Stillaguamish River, near Darrington, Wash. Finding a spawning nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)

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In this photo taken Tuesday, April 15, 2014, fisheries biologist Pete Verhey looks for evidence of fish eggs as he wades in Squire Creek, a tributary of the North Fork of the Stillaguamish River, near Darrington, Wash. Finding a spawning nest, called a redd, is an encouraging sign that steelhead trout may be making their way upstream from Oso., Wash., above where a massive landslide decimated a riverside neighborhood a month ago and pushed several football fields worth of sediment down the hillside and across the river. As search crews continue to look for people missing in the slide, scientists also are closely monitoring how the slide is affecting federally endangered fish runs, including Chinook salmon and steelhead. (AP Photo/Elaine Thompson)