The 3-mile (5-kilometer) long cable car is designed to whiz 400 people an hour in each direction a half mile (nearly a kilometer) above the river. The president of the Apurimac state government, Elias Segovia, anticipates the $45 million tramway will bring about 3,000 tourists a day after it opens in late 2015.
"This is going to generate tourist services. It will generate great investment" in hotels, restaurants and other amenities, he says.
The idea is to shift some of the tourist burden from Machu Picchu, where authorities have a limit of 2,500 daily visitors and where reservations are now required for people who wish to hike the famed Inca Trail to the ruins.
Currently, most visitors to Choquequirao must fly to Cuzco, the former Inca imperial capital, and then drive four hours on mountain roads prone to landslides and flooding. Then it's another 12 to 16 hours on foot.
It's little wonder Choquequirao (CHO-kay-keer-ow) gets only about five visitors a day.
"When we went there it was the two of us and the two rangers," said Jeff Widman, a 27-year-old Internet entrepreneur from Menlo Park, California, who trekked there with his wife, and continued on to Machu Picchu.
Choquequirao, which means "cradle of gold" in Quechua, is believed to be the last refuge of Incan rulers who fled Cuzco after its leader Manco Inca was defeated by Spanish conquistadors. It is draped over the fold of a lesser mountain in the shadow of Salcantay peak, surrounded at 9,950 feet (3030 meters) by steep precipices. Its buildings and irrigation canals meticulously hewn into rock are as well-preserved as those of Machu Picchu, its "top-of-the-world" views equally spectacular.
Only about 30 percent of Choquequirao has been cleared for tourism. The rest, for now, remains covered in vegetation.
David Ugarte, regional director of culture in Cuzco, predicts the tramway will open up to broader tourism not just Choquequirao but also other archaeological sites in the region. It is the first of 24 that President Ollanta Humala envisions building in each of Peru's states to boost tourism.
Not everyone is happy about it.
Arturo Almiron, of the travel agency Tours a Cuzco, believes it will put off a certain kind of tourist who wants to be thrown back spiritually to the epoch when the city was the Inca capital, to watch condors soar in the quiet stillness of untrammeled hills.
"Cuzco's very character is in the preservation of its historical center and archaeological sites," he said. "If we build a tramway, that preservation is altered. A touch of modernity is added that isn't very attractive. Authenticity is lost."
Mandy Kalitsis of Toronto, operations manager for the Cuzco-based Apus-Peru tour company, acknowledged the site "will lose some of its charm."
"But as long as the government manages (the tramway) properly, I think it can bring some good into the area," said Kalitsis, whose company organizes treks to Choquequirao.
Peru's Housing Ministry and Apurimac's regional government are about to begin taking bids for construction. Companies from Switzerland and Andorra have already expressed interest.