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In this photo taken on Tuesday, May 20, 2014, improvements are being finalized along the the south portion of the River Walk along the St. Clair River in Port Huron, Mich. A grand opening for the River Walk will be on June 7. (AP Photo/The Port Huron Times Herald, Jeffrey Smith) NO SALES
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FILE - Robert Sallee, the last living survivor of the 1949 Mann Gulch fire near Helena, Mont., that killed 13 smokejumpers, is shown in this May 1991 file photo at the U.S. Forest Service Smokejumper Center in Missoula, Mont. Sallee, 82, died Monday May 26, 2014 from complications following open heart surgery. His death was confirmed by the Hazen & Jaeger Valley Funeral Home, which is handling arrangements. (AP Photo/USDA US Forest Service)
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A boat makes it's way up the Hudson River north of the Tappan Zee bridge, under construction in Tarrytown, N.Y., Wednesday, May 28, 2014. As part of a condition of constructing the new bridge, the New York State Department of Environmental Conservation has required the state Thruway Authority to track and study federally endangered sturgeon that live in the river near the bridge. Scientists are tagging and tracking sturgeon using surgically implanted electronic tracking devices to study whether the bridge construction affects their behavior or reproductive life cycles. (AP Photo/Kathy Willens)
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Biologist Chris Burnett throws a sturgeon back into the Hudson River north of the Tappan Zee bridge in Tarrytown, N.Y. Wednesday, May 28, 2014, after surgically implanting an electronic transmitter in the fish's belly. Scientists hope the tracking devices will allow them to track and study the federally endangered species to detect behavioral or adverse affects during construction of the new Tappan Zee bridge. While the sturgeon's life and reproductive cycle is complex, the fish spawns in the Hudson River in April and May. (AP Photo/Kathy Willens)
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A biologist sutures up the incision in the belly of a shortnose sturgeon_ placed on it's back on a wooden support for the surgical procedure_after implanting an electronic tracking device in the fish's belly aboard a boat in the Hudson River above Tarrytown, N.Y., Wednesday, May 28, 2014. New York State's Department of Environmental Conservation has required the New York State Thruway Authority to track and study the federally endangered sturgeon during construction of the new Tappan Zee bridge, which spans the Hudson River in the suburbs north of New York City. The implanted tracking devices will allow scientists to determine whether construction of the new bridge is affecting the fish's behavior and reproductive cycles. (AP Photo/Kathy Willens)
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Biologist Chris Burnett places a shortnosed sturgeon on a board containing a ruler for measuring before implanting an electronic an electronic tracking device in the fish's belly near the Tappan Zee Bridge north of Tarrytown, N.Y., Wednesday, May 28, 2014. The tagging is part of The shortnose sturgeon and its much larger cousin, the Atlantic sturgeon, are on the federal endangered species list. Both types of sturgeon will be tracked and studied as the state of New York complies with safety measures that were conditions of the New York Thruway Authority's permit to build the new Tappan Zee bridge, scheduled for completion in 2018. (AP Photo/Kathy Willens)
