Climate change and overuse are causing one of the Colorado River鈥檚 biggest reservoirs, Lake Powell, to drop. While water managers worry about scarcity issues, two Utah river rafters are documenting the changes that come as the massive reservoir hits historic low points.
For the past three years, Moab-based river runners Mike DeHoff and Pete Lefebvre have carefully photographed and mapped Cataract Canyon on their boating trips. For decades, Lake Powell buried the lower portion of the beloved canyon under flatwater. But now that the lake鈥檚 water levels are dropping, things are rapidly changing in the canyon.
鈥淭here are rapids down there that are not on any published river map right now,鈥� DeHoff said. 鈥淭hey're coming back at a rate that publication can鈥檛 keep up with.鈥�
The pair photograph these returning rapids year to year, illustrating in real time what it looks like as Lake Powell鈥檚 water levels drop and shift. Lefebvre says he was inspired by Chasing Ice, a 2012 film that documented shrinking glaciers from a sustained rise in global temperatures.
鈥淚 remember watching that movie and thinking, 鈥業 need to be doing this in Cataract,鈥欌€� Lefebvre said. 鈥淚f I have a picture of Dark Canyon and the mouth of Clearwater [Canyon] and these places where the rapids used to be, maybe I can start documenting that change.鈥�
It wasn鈥檛 long before their hunt for new rapids sent them digging into the past. DeHoff has spent hours poring over old river maps, guidebooks, and historic photos in search of clues.
鈥淭he great thing about it is it's a real live treasure hunt and kind of terra incognito every year,鈥� said DeHoff.
Their first 鈥渆ureka moment鈥� came when they correctly matched a 1921 photo from a survey of the Colorado River with one of their own. The picture shows a boat running through a dynamic stretch of Lower Cataract, where the reservoir鈥檚 mostly flatwater exists today. But Lefebvre says, some character is now coming back to the area.
鈥淚t started with just like a little ripple in the water to the surface, and then there was a little burble. And then oh, there was the tip of a rock sticking out,鈥� Lefebvre said. 鈥淎nd then another rock was sticking out, and then eventually you start seeing this thing turn into a riffle.鈥�
They named the area La Rue鈥檚 Riffle for E.C. La Rue, the U.S. Geological Survey hydrologist who took that photo nearly a century ago.
Fed up with the slow rate of guidebooks, the pair recently published their own supplemental river map on their website, . It lays out the freshest, gnarliest rapids of the lower canyon.
鈥淚nitially we were just doing it for us,鈥� said DeHoff. 鈥淏ut people get excited about rapids. And that鈥檚 just been this thing that鈥檚 been a spark that has caught a lot of people's attention.鈥�
Their citizen science work has attracted Colorado River decision makers and researchers like Utah State University professor Jack Schmidt, who runs the Center For Colorado River Studies. Some of Schmidt鈥檚 work receives funding from the Walton Family Foundation, which also supports KUNC鈥檚 Colorado River reporting project.
鈥淭he greatest value of what Mike DeHoff and Pete [Lefebvre] and others are doing in the Returning Rapids Project is that they're collecting the basic data that gives people pause, to say, there's a benefit and a cost to everything we do about the Colorado River,鈥� said Schmidt, who has devoted over 30 years to studying Colorado River issues. 鈥淭hat benefit or that cost is something we ought to know about before we do it.鈥�
This fall, Schmidt joined other academics and research scientists on a trip through the canyon with DeHoff and Lefebvre. Cataract Canyon is becoming a well-known place to study what happens to an ecosystem when a reservoir recedes, and a river has a chance to return to a sense of former wildness.
鈥淲e've taken some people who are highly trained scientists, and geologists, and whatever out there,鈥� DeHoff said. 鈥淎nd it's really neat to see their faces where they鈥檙e like, 鈥業've been studying geomorphology for 15 years and here I am out here seeing it right before my eyes, happening faster than I can even believe it's happening.鈥欌€�
Whether due to overuse, prolonged drought, or political change, researchers are beginning to contemplate a future for a severely diminished Lake Powell. This October the reservoir dropped to just under 11 million acre-feet of water, or just 45% of its total capacity. With a dry and warm winter on the horizon in 2021, there鈥檚 no relief on the horizon.
The Returning Rapids project is showing a silver lining to a reduced reservoir, Lefebvre said. It鈥檚 not only about new thrills for rafters 鈥� they鈥檙e also watching an entire ecosystem shift.
鈥淚nstead of this monoculture of weeds and a mud canal鈥e're getting all this character back with rapids, beaches, currents, eddies, animal life, and native vegetation,鈥� Lefebvre said. 鈥淎nd so that's how I see [Cataract Canyon] recovering. It's a nicer place to be now.鈥�
Negotiations on a new set of operating guidelines for the Colorado River鈥檚 management are set to begin at the end of this year. Who is at the table for those talks is still in flux, but Schmidt says river recreators have been 鈥� and will continue to be 鈥� powerful players in the Colorado River basin.
鈥淭hey have the potential to change the debate,鈥� Schmidt said. 鈥淎nd it reminds us that boatmen have a tremendous stake and a tremendous potential influence, because they know and care about the resource so much 鈥� and it really needs to be celebrated.鈥�
DeHoff hopes that the Returning Rapids of Cataract Canyon gets people thinking about how natural forces can counter the impact humans have on the environment. His advice? Pay attention to those special places in the world, and then decide which way you want the balance to tip.
This story is part of ongoing coverage of water in the West, produced in partnership with public radio stations KZMU and KUNC, and supported by a grant from the Walton Family Foundation.
