The sole pipeline that supplies water for millions of Grand Canyon visitors sustained severe damage in weekend flash floods, with park officials estimating that approximately 40 percent of the 12.5-mile Transcanyon Waterline was damaged and miles of pipe potentially destroyed, creating a repair challenge on some of the most remote terrain in the national park system.
At least two people died in the floods and one person remained missing as of Monday night, after rescuers saved approximately 80 people over the weekend. The park halted overnight accommodations and implemented conservation measures, asking visitors and residents on the South Rim to take short showers, turn off taps while brushing teeth and flush toilets selectively to protect the limited stored water supply.
Grand Canyon Deputy Superintendent Brian Drapeaux said officials anticipate miles of the pipeline being destroyed, though a full survey of the damage could not be completed until Tuesday at the earliest. Officials estimated the scope from aerial flyovers, but ground assessment was required to determine the full extent of what the floods did.
The damage complicates a project that was already underway. A more than $200 million repair and replacement project for the Transcanyon Waterline had been in progress when the floods struck. The pipeline has sustained dozens of breaks in recent years, and the terrain it crosses is so remote and rugged that helicopters are often required to make basic repairs. The flooding has now added an acute emergency to what was already a long-term infrastructure challenge.
What the water situation means for operations
The South Rim is where most of the park’s visitors go, and it relies on the Transcanyon Waterline for essentially all of its water. The pipeline runs from Roaring Springs near the North Rim, down through the canyon and up to the South Rim, a route that follows terrain with no easy ground access for much of its length.
A veteran river runner and Grand Canyon hiker described what the park would need to sustain, including law enforcement, search and rescue, backcountry operations, park administration, a medical clinic and campground operations. He noted that in past water emergencies, the park has brought in water by tanker truck, which is the most likely short-term mitigation option until the pipeline can be repaired.
The pipeline’s history
The Transcanyon Waterline was originally built in the 1960s and has been the subject of sustained concern about its condition for decades. The more than $200 million repair and replacement project that was underway represented one of the most significant infrastructure investments in the park’s modern history, driven by the pipeline’s history of frequent breaks and the difficulty of repairing them in such remote terrain.
The flooding has not only damaged infrastructure but has added complexity to the repair project, since portions of the line that may have been scheduled for replacement may now be destroyed rather than upgraded.
The broader picture
The flood deaths and the missing person represent the human toll of a severe weather event. Search and rescue operations were ongoing as of Monday night. The park’s immediate priorities are finding the missing person, completing damage assessment and managing the water conservation situation for the residents and visitors currently on the South Rim.
