Water is the real crop: Why irrigation may be the valley’s most important asset

In North Central Washington, agriculture begins long before a tree is planted or a vine is trained onto wire. It begins with the movement of water.

“Water is life,” said Waylon Marshall of the Wenatchee Reclamation District. “The engineering it took to bring water to our valley to allow it to prosper was no easy task. In return, it allowed our local economy to grow and prosper.”

The network that makes that movement possible is largely invisible to the people who drive past orchards and vineyards each day. When the growing season ends and canals are drained, the work that determines the next year’s crop is just getting started. The system that turned arid ground into one of the most productive agricultural regions in the country is now more than a century old, and its continued function depends on a constant cycle of winter decisions about repair, replacement and long-term capital investment.

Within the district’s boundaries, gravity-fed canals still deliver irrigation to nearly every orchard. Unlike pressurized systems that rely on pumps, the network depends on open channels that must be cleared of silt, weeds and storm debris before each season.

“Our system is 100 percent gravity flow,” Marshall said. “Because it’s almost all open canal, we’re dealing with blowing weeds, storm wash-ins and silt that has to be cleaned out before every season.”

When the water stops flowing in the fall, the district’s busiest period begins.

“When we drain the canal system, that is the start of our busy season,” he said. “That’s installing new shotcrete liner where it’s needed, upgrading irrigation delivery boxes, cleaning the canal, and inspecting tunnels, pipelines and flumes that stretch nearly 34 miles across Chelan and Douglas counties.”

The district also maintains two bridges, including a utility span across the Wenatchee River and the ever-present WT Clark bridge that serves as one end of the Apple Capital Loop Trail, but which has also carried an irrigation pipe for more than a century. All of that work is performed by a staff of 13.

Each winter project is a decision about lifespan. Steel delivery boxes that once lasted about two decades are being replaced with precast concrete structures designed to remain in service for 75 years or more.

That long horizon is why irrigation infrastructure has become inseparable from land stewardship. Soil health, crop selection and planting density all depend on a delivery network that can provide reliable and predictable flow.

As on-farm technology has changed, the canal system has had to change with it.

“Handlines and overhead sprinklers are rapidly disappearing,” Marshall said. “They’re being replaced by micro-irrigation with timers, variable-speed pumps and soil-moisture meters that can be monitored on a phone.”

Instead of the steady, around-the-clock delivery schedules that once defined the growing season, water use now rises and falls with weather, crop needs and automated systems.

“It allows the canal system to have a more even flow rather than a sharp spike in usage,” he said.

Land-use change is altering that pattern in more fundamental ways.

In areas where orchards are removed and replanted, overall demand remains relatively stable. Where agricultural ground is converted to residential development, the total water allocation attached to a parcel does not disappear — but the way it is used changes completely.

“When an orchard is pulled out and replaced with housing, the water allocation stays the same, but the usage times drastically change,” Marshall said. “Most of our maintenance callouts are from homeowners.”

Timers in subdivisions create new peak demand periods, often early in the morning or in the evening, and the responsibility for maintaining irrigation infrastructure shifts from growers who traditionally handled their own repairs to a different kind of customer base.

Those changes carry operational consequences, but they also raise a larger policy question. Irrigation districts were designed to support working land. As more acreage moves out of production, the cost of maintaining a system built for agriculture is spread across users with different expectations for service.

At the same time, the pressures on the system continue to grow.

“There is a constant worry about drought, as the trend seems to be less and less snowpack up high where it counts,” Marshall said. “The cost of pipe and concrete has risen dramatically in the last five years, and staying in compliance with changing regulations can be a challenge.”

None of those challenges is visible from the road in midsummer, when orchards appear uniform and fully supplied. The reliability of that water is the result of work done months earlier, when canals are empty and sections of the system are taken apart and rebuilt for another season.

It is also the result of planning for a future in which both agriculture and the valley itself are changing.

“The future of our valley is changing quickly from farming to housing and developments,” Marshall said. “It is a welcome sight when an orchard gets pulled out to see it replanted. But sometimes that is not the case.”

Every upgraded delivery structure, every relined stretch of canal and every inspection of a tunnel or flume is a decision about whether that ground will remain viable for agriculture and how efficiently it will produce when spring arrives.

In a valley defined by its fruit, the most important crop is the one that never appears in a bin — the water that makes everything else possible.

Andrew Simpson: 509-433-7626 or andrew@ward.media