Mercury's surface in "enhanced color," a color scheme created to emphasize color differences. This is not what Mercury would look like to the human eye, but by applying mathematical analysis to images, color differences can be accentuated beyond those visible to a person.
Mount Rushmore National Memorial under construction.
The workers had to endure conditions that varied from blazing hot to bitterly cold and windy. Each day they climbed 700 stairs to the top of the mountain to punch-in on the time clock. Then 3/8 inch thick steel cables lowered them over the front of the 500-foot face of the mountain in a "bosun chair." Despite the dangers, no one was killed during the project.
Otters in Glacier Bay National Park and Preserve, Alaska.
The sea otter population of Glacier Bay has increased dramatically in the past 20 years. Ecologists consider sea otters a keystone species here. Otters consume vast quantities of clams, urchins, crabs, and other invertebrates and their presence creates ripples through the ecosystem. NPS photo.
Every day someone like you becomes a wildland wildfire fighter, a teacher, a trail-builder, a museum curator, or a park ranger. Discover your opportunities in national parks. Come to play. Come to learn. Come to serve. Develop your environmental leadership skills. Find a job. Be the next generation to preserve and protect these great places.
With more than 80% of Americans living in urban areas, urban parks are more important than ever. The father of American landscape architecture, Frederick Law Olmsted, said of urban parks:
It is one great purpose of the Park to supply to the hundreds of thousands of tired workers, who have no opportunity to spend their summers in the country, a specimen of God's handiwork that shall be to them, inexpensively, what a month or two in the White Mountains or the Adirondacks is, at great cost, to those in easier circumstances.
Reclamation Awards $102 Million Contract for Overhaul of Third Power Plant at Grand Coulee Dam
Office of the Secretary
WASHINGTON, DC – Secretary of the Interior Ken Salazar announced today that the Bureau of Reclamation has awarded a $102 million construction contract as part of the project to overhaul the generators in the Third Power Plant at Grand Coulee Dam.
The contract was awarded to Andritz Hydro Corporation of Charlotte, N.C. and will be funded by the Bonneville Power Administration—a regional Federal power marketing agency within the U.S. Department of Energy (DOE) that is self-funded with ratepayer dollars rather than federal taxpayer dollars.
Located on the Columbia River about 90 miles west of Spokane, Wash., the Grand Coulee Dam provides about one-quarter of the total generation of hydroelectric power for the Columbia River System.
“Overhauling the generators in the Third Power Plant is vital to ensuring adequate electric power in the Pacific Northwest,” said Secretary Salazar. “This is a great example of not only how the Department of the Interior is working to support clean, renewable energy for the American people but also of how working in partnership with DOE and BPA enables us to do so more efficiently.”
Three of the six generating units in Grand Coulee Dam's Third Power Plant will be overhauled. These generating units are more than 30 years old, installed in the mid-1970s. The mechanical parts of these units have never been replaced and are beginning to show wear, which reduces reliability and increases power outages.
The generators and turbines will be dismantled and inspected and components will subsequently be either refurbished or replaced and reassembled. Each unit will take 17 months to replace and only one unit at a time will be overhauled. Work begins in March 2013.
Grand Coulee Dam was completed in 1941, and today serves as a multi-purpose facility providing water for irrigation, recreation, fish and wildlife, hydroelectric power production, and flood control.