Google has taken its all-seeing eyes on a trip that few experience: the Colorado River through the Grand Canyon.
The search giant partnered with the advocacy group American Rivers to showcase views of nearly 300 miles of whitewater rapids, towering red canyon walls and rich geologic history.
The 360-degree views that went live this month in Google's Street View map option once were reserved largely for rafters willing to pay hefty fees for guided trips down the river.
Google project leader Karin Tuxen-Bettman hopes the images educate the public about the waterway that American Rivers listed as the most endangered in 2013 because of drought and overuse.
"We hope this inspires viewers to take an active interest in preserving it," she said.
Federal officials and environmentalists have been raising alarms recently about demand outstripping supply on the river serving about 40 million people in seven Western states.
"It's just a valuable snapshot in time of what the river is like right now," said Amy Kober of American Rivers.
Google used two rosettes of cameras mounted on two rafts to capture the imagery in August and then stitched it together. The crew of nearly 20 people, including guides, spent eight mostly sunny days on the river.
The company said the river views are the first of their kind it has published on Street View from the United States. In 2011, Google mounted its Street View trike on a boat and went up the Rio Negro, a tributary of the Amazon, Tuxen-Bettman said.
The company also has used pushcarts and snowmobiles to map places where vehicles cannot travel. In late 2012, Google mapped the most popular Grand Canyon hiking trails using cameras mounted on a backpack.
For rafters on the Colorado River, trips can cost from several hundred dollars to $3,000 a person. Grand Canyon National Park limits the number of people who can go on self-guided trips through a highly competitive lottery and has an annual cap on the number of commercial, motorized trips.
One of the first things virtual visitors might notice is the remoteness of the canyon where rafters spend a few days or nearly a month navigating whitewater rapids, hiking side canyons, snapping photos of waterfalls and endangered species, and savoring the solitude. It's a place where cellphones don't work and rafters pack only what they need.
Rich Harter went on his first commercial trip in 1997 and has returned for rafting trips six times. He'll direct new visitors to Google's Street View to get a feel for what he has experienced.
"The scale is so immense and the geology is so varied, and the time frame over which the canyon formed is just so long," he said. "How do you describe these things to people that haven't seen them? You can't."