In Colorado, a new water year begins
Rocky Mountain PBS I-News
The 2014 water year is ending gently — for Colorado, at least — as monsoonal rains and the remnants of Hurricane Odile provided enough moisture to push even the drought-stricken southeastern quadrant of the state into the 70-90 percent of normal precipitation range.
It’s reasonable to think of it almost as an escape, as the state was cool and wet enough to avoid the massive wildfires of the previous two years, Black Forest in 2013 and Waldo Canyon and High Park in 2012, which claimed a total of more than 1,100 homes. There was no epic September flood this time around.
In comparison to California, which continues in the throes of devastating drought, and parts of Washington and Oregon, where millions of acres burned this water year, Colorado was downright fortunate.
“Water year” is a Western term, and the new one begins Oct. 1. It has to do with the annual cycle that includes the first snow in the High Country, the accumulation of the snowpack, the spring melt and runoff, the warm summer and whatever rain might fall.
That makes Sept. 30 New Year’s Eve of the 2015 water year. But one can forgive residents of southeastern Colorado if they’re not breaking out the party hats. While the late rains boosted moisture totals there toward respectability, the region has been locked in various stages of damaging drought for years.
The U.S. Drought Monitor map, a product of the Department of Agriculture that is updated weekly, has five levels of dryness, from D0, abnormally dry, to D4, exceptional drought. Along with the Texas and Oklahoma panhandles, a big chunk of northeastern New Mexico and southwestern Kansas, southeastern Colorado has been firmly fixed with D3s, extreme drought, and D4s, as bad as it gets.
The modern map, in fact, has looked very similar to that of the Dust Bowl of the 1930s, even though, as of now, it has moderated a bit.
“Absolutely,” said assistant state climatologist Wendy Ryan from her office in Fort Collins. “As we were keeping track, particularly in 2011 and 2012, we started drawing comparisons to the ’30s. It was as dry and as hot down there as the Dust Bowl.”
The visual elements were also there: Enormous dust storms, but not with the frequency or longevity of the 1930s, and tumbleweed melees that covered highways and buried barns and houses.
“They have created havoc on the plains of eastern Colorado,” said Tobe Allumbaugh, chairman of the Crowley County Commission, of the tumbleweed conditions that began this time last year. “After three years of drought, we got moisture in the latter part of August. There was no vegetation to compete with the Russian thistle. They popped out and they were everywhere. We got more rain in September and it was like throwing fuel on the fire.
“By November they began to roll and tumble.”
That is a challenge that likely remains from the summer rains this year.
“After the last few years, a lot of the native grasses are gone,” said Ryan. “The Russian thistle is the first plant to come back with any moisture and we saw what happened last year. They had to use snow plows to clear the highways. It’s probably going to be bad again, but maybe not quite as bad. The hope is that the grasses got enough precipitation to compete (with the thistles).”
The lower Arkansas River basin has a long way to go before recovery to normal, Ryan said. The late-season moisture has allowed farmers there to get a start on winter wheat, an endeavor that hasn’t panned out in the recent drought years. The big word is evapotranspiration, which is the soil losing moisture with no rain, and through plant transpiration, or “plant sweat.”
Which is pretty much what happened in the Dust Bowl. Native grasses were plowed under in order to plant wheat, the bottom fell out of the wheat market, and with drought and heat and wind, evapotranspiration took care of the rest.
The Four Corners were also dry this water year, as was the San Juan River basin, and the Rio Grande has been drought-plagued — which pretty much accounts for the southern tier of Colorado.
In the northern half of the state, the picture for this closing water year has been dramatically different. The upper Colorado River basin has been flush, and beginning after last September’s massive floods, conditions along the South Platte basin have been extraordinary. Winter wheat yields on the northeastern plains were bountiful, conditions there “beautiful,” as Ryan described them.
A look at the “teacup” map published weekly by the Colorado Climate Center at Colorado State University also tells the story. Lake Granby is 128 percent of average for this time of year, 98 percent full. Blue Mesa is 74 percent full, Lake Dillon is 99 percent full. Green Mountain is at 85 percent.
All of this munificence is a matter of scale, of course. Downstream on the Colorado River, massive Lake Powell was only 51 percent full last week, and, on the other end of the Grand Canyon, giant Lake Mead has been losing water after years of drought like someone pulled the plug.
Unrelated to the Colorado River but very related to water in the West is the map published last week by the California Department of Water Resources depicting water levels in the Golden State’s major reservoirs, which ranged from 12 to 39 percent full.
There was actually what some climate observers are calling a drought-induced mudslide on volcanic Mount Shasta in Northern California. Depending on which news story one went with, it was caused by the fracturing of one of the 14,162-foot mountain’s glaciers, or the slippage of a glacier that allowed water trapped underneath to escape and tumble downhill, gathering mud and debris.
So, to water year 2014, auld lang syne. How one views its passing will be a matter of perspective.
The Summit Daily News brings you this report in partnership with Rocky Mountain PBS I-News. Learn more at rmpbs.org/news. Contract Jim Trotter at firstname.lastname@example.org.
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