Honest Cattle · Montana
Measuring Montana Moisture
Water runs Montana ranching — how much fell as snow, how much is moving in the rivers, how much is in the soil, and how much reaches a field through a headgate. Honest Cattle tracks each of these signals, county by county, from the same public sources the agencies use. Here’s what each one measures and why it matters.
The moisture signals we track
Snowpack (SWE)
Snow Water Equivalent — the water held in the mountain snowpack that feeds summer streamflow and irrigation. Reported against the 10-year median so you can see whether a basin is ahead of or behind a normal year.
Source: USDA NRCS SNOTELWater-Year Precipitation
Total precipitation since October 1, the start of the hydrologic water year — the running tally of how wet the season has been, shown as a percent of the 10-year median for the date.
Source: USDA NRCSDrought Monitor
The U.S. Drought Monitor classes (D0 abnormally dry through D4 exceptional drought) and the share of each county’s area in each class — the headline drought picture, updated weekly.
Source: U.S. Drought MonitorStreamflow
Cubic-feet-per-second at the nearest in-county USGS gauge, plus a day-of-year percentile (50 = typical for the date) — what’s actually available to divert right now.
Source: USGS NWISSoil Moisture (VWC)
Volumetric Water Content at shallow and deep probes — the percent of soil volume that is water, the most direct read on whether grass and hay ground can grow.
Source: Montana MesonetRainfall
Observed rain over the prior two weeks and the forecast for the next two, each against the 30-year normal — the short-term recharge that snowpack and streamflow miss.
Source: NOAA / PRISMIrrigation
The water ranchers actually put on the ground. USDA’s Census of Agriculture reports irrigated acres by county — the human-managed moisture that turns a dry bench into hay ground.
Source: USDA Census of AgricultureIrrigation across Montana
Irrigation is the one moisture signal people control directly — and it swings hard with the others. Between the 2017 and 2022 USDA Censuses, Montana’s irrigated acreage fell 336,569 acres (−16.3%). That was mostly drought and short surface water, not a permanent loss of capacity: the 2022 Census found 1,958,905 acres still had irrigation equipment in place, leaving a 234,238-acre gap between land equipped to irrigate and land that actually got watered that year.
About 70% of the decline was irrigated harvested cropland (much of it hay and forage) and about 30% was irrigated pasture and other land. The biggest drops clustered in river-valley counties — Madison, Beaverhead, Carbon, Yellowstone, Lake, Pondera — while 18 counties actually gained irrigated acres.
See it county by county → Every Montana county has its own page with a live conditions dashboard — snowpack, drought, streamflow, soil moisture, rainfall — and its irrigated-acres figures on the county’s Water Rights page. Browse all 56 from the Montana Counties directory.Sources: USDA NRCS (SNOTEL, water-year precipitation), U.S. Drought Monitor, USGS NWIS (streamflow), Montana Mesonet / Montana Climate Office (soil moisture), NOAA & PRISM (rainfall), USDA 2022 Census of Agriculture (irrigated land — acres, Table 10). County rows of the irrigation data sum exactly to the USDA Montana totals for 2017 and 2022. Informational only.