From The Mountain Town News (Allen Best):
Irrigation season on the Carpenter Ranch normally begins in early May and continues until September. The ranch is located along the Yampa River in northwestern Colorado, about 20 miles west of the ski town of Steamboat Springs. Water from the river is used to grow fields of waist-high timothy, clover, and other types of grasses that, after being cut, provide hay for cattle.
This year, the seasonal cycle was disrupted. Irrigation on four of the fields, totaling 197 acres, was suspended on July 1. Instead, the water has been allowed to flow down the Yampa River 100 miles to Dinosaur National Park. There, it joins the water of the Green River coming down from Wyoming, which in turn joins the Colorado River in Utah. The comingled waters then flow into Lake Powell.
Powell is one of two giant reservoirs on the Colorado River, the other being Lake Mead, near Las Vegas. Together, the two reservoirs can hold 16 times the annual flow of the Colorado River—on average. But the river and its many tributaries have been flowing below average most years since 1999. Even after torrential rains and heavy snows in the Colorado Rockies in May, the inflow into Lake Powell this year is just 88 percent of average. It’s part of a long-term trend of declining reservoir levels in a river basin that provides water for 25 to 34 million people. (Estimates vary).
These reservoir declines have instilled a sense of urgency in Jim Lochhead, chief executive of Denver Water. His agency provides water to 1.3 people in metropolitan Denver, with half the water arriving in the city from the Fraser, Blue, and other tributaries of the Colorado River.
“One of the things we have learned in this drought is that it just seems to keep going and going and going,” says Lochhead. “We are really in uncharted territory right now in terms of where the (reservoir) levels are. The levels are the lowest since these dams have been constructed.”
Lake Mead, formed in 1936 as a result of Hoover Dam, is now at 37 percent of capacity. Lake Powell began forming in 1963 as a result of construction of Glen Canyon Dam and is at 54 percent of capacity.
Lochhead and other architects of the Colorado River System Conservation Program want to be ready in case an even more severe drought revisits the Colorado River Basin. Fresh in mind is 2002, when the Colorado River carried only 25 percent of its normal flows, and 2003 wasn’t much better. Should drought of that severity return, Lake Powell could even shrink to something called a dead pool. That’s when there’s too little water to generate electricity. The electricity is distribu ted broadly across the West to towns, cities, and farms. Revenues from sales are used to fund programs designed to protect endangered fish on the Colorado River.
Lake Powell also has another vital function for Colorado and other headwaters states: It is used to me et commitments of water deliveries to the lower basin states of Arizona, Nevada, and California as specified by the Colorado River Water Compact of 1922. Denver’s water rights from the Western Slope of Colorado are mostly junior to the compact. If drought persisted, it’s conceivable that Denver and other water users with more junior rights—including many in the mountain resort community—would have to curtail their diversions in order to comply with the 1922 compact.
To forestall this apple cart from being upset, Denver and several major water providers that tap the Colorado River Basin last year joined with the U.S. Bureau of Reclamation to begin exploring how water can temporarily be shifted from traditional uses and allowed to flow downstream. The Carpenter Ranch along the Yampa River is the first pilot project announced in this Colorado River System Conservation Program.
The ranch is owned by The Nature Conservancy, one of several partners from the environmental community working with Denver and other water providers. The non-profit in turn sublets the land to ranchers, says Geoff Blakeslee, the Yampa River project coordinator for the organization. Taking water off the hay meadows reduces harvest and it will also reduce the number of cattle that can graze the meadows in autumn. About 90 percent of agriculture on Colorado’s Western Slope is, like the Carpenter Ranch, used to produce hay.
Joe Brummer, an associate professor of forage science at Colorado State University, has studied effects of water curtailment in small plots at the Carpenter Ranch as well as other farms. Hay production continues if irrigation ceases, but only in small quantities. The second year, after irrigation has resumed, production lags 50 percent, he says. Even in the third year, again after full resumption of irrigation, production at the Carpenter Ranch test site was 8 to 9 percent below average.
This year, the experiment is different: a split season.
Nine other pilot sites have also been identified, five of them in Wyoming and four in Colorado. They are being funded at a total cost of $1 million. A larger program on the Colorado River involving lower-basins states has a cost of $11 million. Other water agencies providing money, in addition to Denver, include those serving metropolitan Las Vegas and Los Angeles, along with the Central Arizona Water Conservation District, and the Bureau of Reclamation.
Taylor Hawes, Colorado River program director for The Nature Conservancy, says the overarching goal of the pilot program is to learn as much as possible about how water can be shared in time of crisis.
“It’s complicated to move water around,” she says. “These are property rights. Many farmers are unsure how it will impact their water rights if they participate in a project like this. So the point of these pilots is to learn as much as we can right now, so that if a crisis does hit, we will have good information so that we can design a program that allows us to share water in a drought.”
How close is crisis? Too close for comfort, she says. “If this were your savings account and it was continuing to drop, you would be concerned,” she says.
Hawes also sees another, even more dramatic analogy. “I think we were on the edge of the cliff, and depending upon whether it’s a good year or bad year, we take a step forward and backward. The California (drought) situation has highlighted impacts that we will have if we don’t have a plan in place.”
Some say that the Colorado River actually is in worse shape over the long haul than California. New evidence finds that warming temperatures in the Southwest may be causing evaporation and [transpiration] that alone can explain declining reservoir levels.
“The fact that the Colorado River Basin drought is more a product of the heat than any drop in precipitation is a frightening prospect, because that heat is not going to go away,” says Doug Kenney, research associate at the Natural Resources Law Center at the University of Colorado. In fact, because of increased locked into the atmosphere because of accelerating greenhouse gas emissions, all climate models forecast brisk increases of heat in future decades in the basin.
Denver’s Lochhead says the 2002 drought forced the seven states in the Colorado River Basin to consider how to share impacts of drought. Upper Basin states can move water from smaller reservoirs near the headwaters, such as Flaming Gorge in Utah and Navajo in New Mexico, down into Powell. Water can also be allowed to flow downstream through projects such as are being tested at the Carpenter Ranch.
Water providers in the Colorado River program want to work out kinks so that, if crisis occurs, curtailments can be scaled. But many questions remain, such as how to protect water users through the process, to ensure their water rights remain valid. “It’s really the first step,” says Lochhead, and there will be many follow-up questions.
Lochhead is sensitive about how the program is perceived. It is not, he stressed, a grab by cities for agricultural water. The transfers are intended to be temporary and provide compensation to water-right holders. He also points out that it need not be just farms and ranches. One of the pilot programs involves a city on Colorado’s Front Range, he says, but declined to identify the city, because negotiations have not been completed.
“We’re trying to take the perception of winners and losers off the table,” he says. “In this program, everybody wins because the system wins.”
What’s also of note is the extent to which environmental groups have waded into this program. Hawes says The Nature Conservancy wants to work with farmers because, when the river system gets taxed, agriculture and the environment are usually the first to lose. “We need to work to find partnerships,” she says.
Trout Unlimited has also been a major partner. It has property in the Pinedale-Green River area of Wyoming participating, and the organization has also enlisted a small farm along the Gunnison River near Delta, Colo. Cary Denison, project coordinator for Trout Unlimited in the Gunnison Basin, says the farmer will fallow the land for one year then, in the second year, plant a lower consumption crop. Corn, the current crop, takes two feet per acre. Winter wheat only requires a foot.
“Our role is very limited. I am looking at this is a way of participating in an interesting pilot project that looks at consumptive use of different crops.”
While some farmers already knew about the pilot program, he says, others needed to understand the motivation.
Some ratepayers in Denver also wanted to know why Denver Water would be paying farmers to let water flow downstream toward California. That question gets to the heart of the great complexity of water and the Colorado River Basin, points out Doug Kenney, research associate at the Natural Resources Law Center at the University of Colorado.
Denver itself is outside the basin, of course. Cheyenne, Albuquerque, and Salt Lake City, plus Phoenix and Tucson, Los Angeles, and San Diego are similarly outside the basin—but also depend upon Colorado River water.
For such a relatively small river, it pulls a heavy load.
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