FLAGSTAFF, Ariz., May 21 (UPI) -- The U.S. Geological Survey says it will conduct scientific overflights at the Grand Canyon National Park in Arizona during the Memorial Day weekend.
WASHINGTON, Jan. 28 (UPI) -- U.S. Interior Department officials brushed off evidence of environmental harm when they moved to reduce water flows in the Grand Canyon, a park official says.
FLAGSTAFF, Ariz., Sept. 11 (UPI) -- U.S. researchers said some of the Grand Canyon sandbars and beaches built up by a manmade flood earlier this year are already eroding.
FLAGSTAFF, Ariz., Aug. 18 (UPI) -- Officials were considering further evacuations in the Grand Canyon in Arizona following a dam breach, police said Monday.
NEW YORK, March 7 (UPI) -- U.S geologists said new findings suggest the Grand Canyon is probably at least 11 million years older than scientists had estimated.
PAGE, Ariz., March 5 (UPI) -- U.S. officials released a flood into the Grand Canyon to try to undo damage caused by construction of the Glen Canyon Dam in the 1960s.
HUALAPAI, Ariz., April 10 (UPI) -- Two weeks after opening, the Hualapai Indians' breath-taking glass-bottomed Skywalk over the western Grand Canyon is drawing mixed reviews.
GRAND CANYON, Ariz., Feb. 11 (UPI) -- A $40 million glass walkway above the Grand Canyon could signal the start of an Indian tribe's commercial development, but critics call it a desecration.
GLEN CANYON DAM, Ariz., Nov. 19 (UPI) -- Officials plan to release enough Colorado River reservoir water to push so much sediment downstream it will rebuild beaches at the bottom of the Grand Canyon.
WASHINGTON, Aug. 16 (UPI) -- A federal appeals court handed a partial victory to environmentalists Friday in the battle over airplane noise in the Grand Canyon National Park. The court rule
