By CIRCulator Editorial Staff
Reprinted from: The Climate CIRCulator
AS OREGON AND THE NORTHWEST come out of what has been one of their wettest winters on record, it’s easy enough to forget that last year at this time our water supplies were in terrible shape. Starting in the fall of 2013 and lasting until the fall of 2015, much of the Northwest was mired in a severe drought. Last year ended up being the worst of those years. With temperatures during winter and spring about 5 to 6 degrees Fahrenheit above the twentieth century average in the Northwest, 2015 also looked eerily similar to what climate models suggest could be the norm by the 2050s.
But the drought’s growing severity and possible resemblance to the region’s future also presented an opportunity to gauge how people and organizations were adapting. We decided to document these adaptations. Last summer, CIRC partnered with Oregon Sea Grant to interview Oregonians about how they were responding to the drought. Video of these interviews is now available. What follows is a quick summary of what we found.
Mountain Recreation and the Flavor of Drought
Drought comes in a variety of magnitudes and types. Last year Oregon and much of the rest of the Northwest was under what has been called a snow drought, a drought driven not by a lack of precipitation (last year’s precipitation levels were just below average) but by the fact that what precipitation fell did so chiefly as rain, not as snow, because temperatures were so high.
The effects of this lack of snow were most obvious in Oregon’s mountains. At the Mt. Ashland Ski Area in southeastern Oregon near the California border, we spoke with Hiram Towle, the ski area’s general manager. The previous winter, the Mt. Ashland Ski Area didn’t open at all because of a lack of snow. That’s when they hired Towle. Originally a ski area manager in Maine, where ski resorts operate on much smaller amounts of snow than they do in the West, Towle quickly got to work, instituting a number of strategies to help his new employer adapt and stay open.
“We got creative in how we used the snow that we got [and] moved it out to the hill from areas we could find it,” Towle told us in our video interview. He credits this technique, known as snow-harvesting, and other strategies—such as thinning vegetation on ski slopes—for helping the the Mt. Ashland Ski Area open in the winter of 2015 and stay open during the busy winter holidays, a make-or-break time for ski areas. Looking ahead, Towle says Mt. Ashland plans to diversify its business model to include more summer recreation, including zip lines and concerts. This diversification, says Towle, should help his organization be less dependent on snow for its revenue.
Farming and Further Implications of the Snow Drought
Elsewhere in Oregon, we saw other signs of the snow drought. Snow in the mountains acts as a kind of water savings account—a natural reservoir. Melting as winter turns to spring and daily temperatures rise, the snow provides water into the warmer and drier summer months. But our warming climate is changing that. Warming temperatures, particularly during winter when we receive most of our moisture, means precipitation falls more frequently as rain instead of snow, and a warm spring melts the snow earlier. Together, these effects have thrown off the timing of stream flows and other water sources in Oregon and the Northwest.
More than 400 miles northeast of Mt. Ashland, Oregon’s Treasure Valley lies along the Idaho border in Malheur County. Treasure Valley supports overs 100,000 acres of farmland. These fields are irrigated with snowmelt collected behind the Owyhee Dam. Built in 1932, the dam usually holds more than 700,000 acre feet of water for farming. This is enough water for two years’ worth of crop production, unless it fails to fill. This is what happened in each of the past three years, an unprecedented event, according to Jay Chamberlin, manager for the Owyhee Irrigation District.
“Farmers received only about one third of their normal amount of water,” Chamberlin told us in our video interview.
The most common example of adaptations by Treasure Valley farmers to the short water year was to fallow (not cultivate) land and consolidate water to grow their highest value crops on a smaller amount of acreage. Dana Tuckness, a wheat and row crop farmer in the valley, told us that last year he planted only half of the normal acreage for his sugar beets and about one third of his dry beans.
Some of the most innovative drought-coping strategies employed by Treasure Valley farmers were not direct responses to the drought but came about as a way to address runoff from excess irrigation that spills sediment and nutrients into nearby streams, negatively impacting fish and other aquatic species. Nonetheless, as Bill Buhrig, a crops specialist with the Oregon State University Extension in Malheur County, told us, these innovations have paid dividends in the drought.
Buhrig showed us a number of sites in the Vale Oregon Irrigation District where district managers have been converting open irrigation ditches to buried pipe, an innovation that has significantly reduced water loss from the irrigation canal due to seepage to groundwater, weeds, and evaporation. The system also uses gravity to pressurize irrigation on farms and does away with the need for diesel or electric water pumps.
Buhrig also showed us farms that have converted from flood irrigation, where water is spilled from a ditch through crop furrows across the field, to drip irrigation systems that deliver water through small buried tubing directly to the plant’s root system. This conversion increases irrigation efficiency to around 90 percent. In all, these investments added weeks to the irrigation season.
“While many of these changes occurred over many years because of concerns around water quality,” Buhrig said, “they have been an important factor in helping us get through these drought years.”
Salmon and the Snow Droughts
Another piece to the snow drought is how it affects fish. Salmon and many other important Northwest fish species have a limited temperature range they can tolerate. In drought years, water in the summer and spring months can often be too low and too warm for them to tolerate.
We saw the effects of drought on fish along the southern Oregon Coast, where we met with Frank Burris. A watershed educator for Oregon Sea Grant Extension, Burris showed us several restoration projects that have improved stream conditions for juvenile salmon, lowering the water temperature by six to seven degrees Fahrenheit and extending stream flow in small salmon rearing streams by up to two weeks. The context of what this means was provided by Denis Reich from the Freshwater Trust, a conservation group based in Portland, Oregon.
“Restoration is about restoring the health and resiliency of the river’s ecosystem function,” Reich told us. “[It’s] an important part [of] mitigating the impacts of drought.”
Reflecting on the Project
This project began as an effort to understand how communities were responding to very acute stresses around drought and poor snowpack, conditions that look similar to what we might expect as climate change continues to unfold in our region. While there were clear responses to seasonal drought, what was perhaps most surprising was that the most successful adaptations were years in the making and came about for reasons other than drought. As we think about planning and preparing for changes brought on by a warming climate, we will do well to remember that adaptation does not necessarily mean reinventing the wheel. Part of it may include what Reich described as “increasing the pace and scale” of the good work already taking place.
John Stevenson is CIRC’s Regional Extension Climate Specialist, a position jointly-funded by CIRC and Oregon Sea Grant. He is also a member of the Agriculture Climate Network team.