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What a Tough Water Year Means for SE Idaho Farmers — and How to Stretch Every Acre

· 5 min read ·
agriculturewaterdrought

By any honest measure, 2026 is shaping up to be a difficult water year.

Idaho entered this spring with one of the lowest snowpacks in the 45-year SNOTEL record — 7th percentile statewide as of March 1, according to the NRCS Idaho Water Supply Outlook. That is not the result of a dry winter; precipitation was near-normal in most basins. The problem is temperature. Idaho experienced the warmest winter on record — outpacing the previous record set in 1934 across 131 years of observations — and almost all of that moisture fell as rain instead of snow. The mountains that normally bank water for July and August deliveries are sitting nearly empty.

The numbers downstream from that are uncomfortable. Low-elevation streamflow forecasts across the Snake River system are running at 70–75% of average. Individual basins are worse: the Owyhee hit a record-breaking 18% of normal snowpack. For growers in Twin Falls, Cassia, Jerome, Gooding, and Minidoka counties, these figures are not abstract — they translate directly into crop decisions that need to be made now.

Who Is Most Exposed

Not all crops carry equal water-demand risk. The exposure concentrates in the highest water-use crops that SE Idaho is known for.

Potatoes require 18–23 inches of crop water use over the season, with total applied irrigation typically running 22–28 inches depending on system efficiency. Yield declines become significant — roughly 20–25 hundredweight per acre — for every inch of crop water use reduction during tuber bulking. A field that looks fine in June can be in serious trouble by July if water is short at the wrong moment.

Sugar beets require 22–28 inches through the growing season, with peak daily demand exceeding a quarter inch per day when the root system is fully developed. Late-season water requirements are the hardest to meet in a year when supply is already stressed. Statewide, sugar beet acreage is already down 5% year-over-year at 158,000 planned acres — a market under pressure even before the irrigation picture came into focus. The USDA recently raised the Commodity Credit Corporation loan rate for sugar beets to 32.56 cents per pound for Idaho, Oregon, and Washington — the first increase in 40 years — which helps margins but does not add water.

Alfalfa adds up in volume over the season: 20–46 inches per season depending on cutting schedule and conditions. For hay operations, the core question this year is which cuttings to prioritize, not whether to maximize all of them. First and second cuts carry the highest economic value per acre-inch. Spreading limited water thin across a full cutting schedule risks losing quality across all of them.

Small grains and dry beans use significantly less water — and in a year like this, that difference is real when you are choosing which fields to irrigate at full rate and which to fallow or shift to lower-water alternatives.

What It Means in Practice

Some acreage in SE Idaho will not be irrigated the same way it would in a normal year. That is not a planning failure — it is the appropriate response to limited supply. Water managers and University of Idaho Extension are actively advising growers to reduce acreage in high-water-use crops and to evaluate fallowing the most water-inefficient fields.

The Idaho Water Supply Bank, operated by the Idaho Water Resource Board, allows holders to lease surplus water at $33 per acre-foot. In some cases, leasing saved water rather than irrigating a marginal field through August comes out ahead economically — particularly for fields with significant soil variability that limits their water-holding capacity, or fields with junior water rights facing late-season curtailment exposure.

The other shift that matters is irrigation timing. Calendar-based scheduling — applying water on a fixed rotation regardless of what the crop actually needs — is a liability in a short-water year. The IDWR’s ET-IDWR platform (et-idwr.idaho.gov) provides evapotranspiration and net irrigation requirement data by crop and location from 212 stations statewide. Matching applications to actual crop demand rather than a calendar reduces applied water by 15–25% with minimal yield penalty in well-managed fields. In a deficit year, that margin is worth capturing.

Knowing Where Your Water Is Going

Beyond overall volume, the question that becomes urgent in a short-water year is spatial: within any given field, where is the water having the highest return per inch applied?

Center pivots cover a lot of ground, but they do not apply water uniformly across it. Soil variability, terrain, and system non-uniformity mean some zones receive more than they need while others get less. In a normal year, that inefficiency is manageable. In a year where every inch counts, it is waste you cannot afford.

A multispectral drone flight at the right point in the season — using the Normalized Difference Vegetation Index (NDVI) early on, or the Normalized Difference Red Edge Index (NDRE) once the canopy closes — produces a spatial map of where your crop is actually experiencing stress and where it is not. That map can feed directly into variable rate irrigation (VRI) prescriptions, or inform simpler allocation decisions about where to concentrate available water on any given irrigation cycle.

The value is most concrete for operations with VRI-capable center-pivot systems. But even without VRI, knowing from an early-season flight which fields are emerging unevenly, which are below expectation for the variety and soil type, and which have the highest response potential under your current allocation helps with upstream decisions that shape the whole season.

The Case for a Baseline Flight Now

The window for an early-season baseline flight is short. A flight flown within the first three to four weeks after emergence creates the reference frame that makes every later flight more useful — you can see what changed, where, and at what rate. Once canopy closes, that baseline reference is gone.

In a normal year, skipping the baseline and relying on mid-season imagery is a manageable tradeoff. In a deficit year, when stress can develop faster and at finer spatial scale, the decision-making value of early data is higher — and the window to act on it before yield impact locks in is shorter.

That is the case for scheduling the baseline flight in late April or early May rather than waiting for something visible to go wrong.

Key Takeaways

  • Idaho’s 2026 snowpack is at the 7th percentile of the 45-year SNOTEL record; low-elevation streamflow forecasts are running 70–75% of average.
  • Potatoes, sugar beets, and alfalfa carry the highest water-demand exposure; fallowing marginal fields and leasing saved water through the Idaho Water Supply Bank may be better economics than irrigating through August.
  • ET-based irrigation scheduling typically reduces applied water 15–25% with minimal yield penalty — a meaningful margin against a constrained allocation.
  • Multispectral drone monitoring helps direct limited water toward fields and zones with the highest return per inch applied, either through VRI prescriptions or informed allocation decisions.
  • The baseline NDVI flight window closes with canopy closure — late April through early May is the right time.

Get a Baseline Flight on the Calendar

If you are evaluating multispectral crop monitoring for your operation this season, we are glad to talk through what the data can tell you and whether it makes sense for your fields.

Talk to us about a baseline flight →

Sources: NRCS, Idaho Water Supply Outlook Report, March 1, 2026; IDWR, ET-IDWR platform (et-idwr.idaho.gov); USDA NASS, 2026 Prospective Plantings (Idaho sugar beets); USDA AMS, Idaho Market News, April 9, 2026; Idaho Water Resource Board, Water Supply Bank pricing; University of Idaho Extension, BUL 789 (Potato Irrigation), BUL 1003 (Idaho Sugar Beets); AgMarketAnalyst weekly market scan, April 20, 2026.