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In this May 20, 2014 photo, a truck moves dirt along what will eventually be an improved mountain highway, during a road-building operation on Highway 36 between Lyons at Estes Park, Colorado. The goal of the project is to move the road further from the adjacent river, which undermined the road for miles during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In this May 21, 2014 photo, Yenter Drilling and Blasting explosives expert John Vincent strings away a spool of detonation cables while rigging a hillside to blow, during a road-building operation on Highway 36 between Lyons at Estes Park, Colorado. The goal of the project is to move the road further from the adjacent river, which undermined the road heavily during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In this May 21, 2014 photo, Yenter Drilling and Blasting's Russ Yenter rides a drilling rig to a safe distance after rigging a hillside to blow, during a road-building operation on Highway 36 between Lyons at Estes Park, Colorado. The goal of the project is to move the road further from the adjacent river, which undermined the road heavily during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In this May 21, 2014 photo, Yenter Drilling and Blasting use explosives to break up a hillside into transportable and useful boulders, during a road-building operation on Highway 36 between Lyons at Estes Park, Colorado. The goal of the project is to move the road further from the adjacent river, which undermined the road heavily during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In this May 21, 2014 photo, Yenter Drilling and Blasting explosives experts Russ Yenter, left, and John Vincent connect detonation cables to blasting charges placed into holes drilled in rock, during a road-building operation on Highway 36 between Lyons at Estes Park, Colorado. The goal of the project is to move the road further from the adjacent river, which undermined the road heavily during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In this May 21, 2014 photo, Yenter Drilling and Blasting explosives experts Russ Yenter, left, and John Vincent string detonation cables away from blasting charges placed into holes drilled in rock, during a road-building operation on Highway 36 between Lyons at Estes Park, Colo. The goal of the project is to move the road further from the adjacent river, which undermined the road heavily during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In this May 21, 2014 photo, Yenter Drilling and Blasting's Russ Yenter places explosives into holes drilled in rock, during a road-building operation on Highway 36 between Lyons at Estes Park, Colorado. The goal of the project is to move the road further from the adjacent river, which undermined the road heavily during floods the previous fall, in hopes of preventing such destructive flooding in the future. (AP Photo/Brennan Linsley)

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In a Friday, May 9, 2014 photo, Robert Jefferson, 86, looks over the barn where he unloaded hay as a young boy on his Heritage Farm in Dunkerton, Iowa. Jefferson's Heritage Farm is 158 years old, and one of only 10 in Black Hawk County that have earned the Heritage designation from the Iowa Department of Agriculture and Land Stewardship. (AP Photo/Waterloo Courier, Matthew Putney)