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This photo taken Thursday, Feb. 27, 2014, in Valdez, Alaska, shows a sea otter in the bay near the ferry dock. The U.S. Geological Survey report released Friday, Feb. 28, 2014, concludes sea otters in Alaska's Prince William Sound have recovered to levels seen before the Exxon Valdez oil spill nearly 25 years ago. (AP Photo/Mark Thiessen)
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This photo taken Thursday, Feb. 27, 2014, in Valdez, Alaska, shows a sea otter in the bay near the ferry dock. The U.S. Geological Survey report released Friday, Feb. 28, 2014, concludes sea otters in Alaska's Prince William Sound have recovered to levels seen before the Exxon Valdez oil spill nearly 25 years ago. (AP Photo/Mark Thiessen)
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This photo taken Thursday, Feb. 27, 2014, in Valdez, Alaska, shows a sea otter in the bay near the ferry dock. The U.S. Geological Survey report released Friday, Feb. 28, 2014, concludes sea otters in Alaska's Prince William Sound have recovered to levels seen before the Exxon Valdez oil spill nearly 25 years ago. (AP Photo/Mark Thiessen)
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In this photo taken on Sept. 13, 2013, a woman takes photos of a guard rail at a flood damage bridge on County Line Road outside Longmont Colo., during the height of major flooding in the state. Nesting bald eagles have prompted the delay of the bridge rebuilding project near Longmont, while local officials try to comply with federal regulations protecting endangered species. (AP Photo/The Daily Times Call, Matthew Jonas) NO SALES, MAGS OUT, TV OUT, MANDATORY PHOTO CREDIT: NEWSPAPER AND PHOTOGRAPHER
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In this photo taken on Thursday, Feb. 27, 2014, U.S. Army Corps of Engineers use airboats to travel along the Lake Pepin section of the Mississippi River near Wabasha, Minn., to survey the thinkness of the ice covering the ricer. The survey, the first one of the year, is part of the Corps’ task of maintaining and monitoring the river’s navigation system, which is vital to the Upper Midwest’s economy. The weekly results are tracked by river shippers eager to get to work for the new season. (AP Photo/The Star Tribune, Richard.Sennot) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT
