Glen Canyon Dam

Grand Canyon National Park

Sand is an important resource in the Grand Canyon. It creates campsites for river runners, protects archeological sites, and provides wildlife habitat. But stretches of bare sand have vanished since the construction of Glen Canyon Dam. A new study published last week looks at how the Grand Canyon has changed because of the dam, and what it will look like twenty years from now. KNAU’s Melissa Sevigny spoke with lead author Alan Kasprak, a geoscientist at Fort Lewis College in Colorado.


In autumn swarms of flying insects cloud the skies on the lower Colorado River near Bullhead City. Caddisflies are a nuisance to recreationists who want to boat, swim or fish on the river. So city officials have started an unprecedented experiment to get rid of them. They recently tweaked the operation of Davis Dam to lower the river’s level and try to kill off the bugs. But just three hundred miles upriver another first-of-its-kind experiment is happening at Glen Canyon Dam, with the goal of SAVING caddisflies, not killing them. KNAU’s Melissa Sevigny reports on how the Southwest’s largest river ended up in a tug-of-war over a tiny bug.


NPS

Federal water managers are warning hikers and river runners below Glen Canyon Dam that Colorado River levels could suddenly fluctuate in the coming weeks. Officials plan to release more water from the dam to meet increasing summer electricity needs in the Southwest. KNAU’s Ryan Heinsius reports.


John Blaustein

Floating down the Colorado River through the Grand Canyon can be a leisurely, relaxing experience. But for a handful of river runners, speed is the real objective.


Luca Galuzzi/Wikimedia Commons

Visitors to a national recreation area straddling the Arizona-Utah border are being asked to stay away from a rock art site that features sheep carved thousands of years ago.

 

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