Treasure County, Montana

Overview

Treasure County is one of Montana’s smallest counties by both area and population, situated along the Yellowstone River between Billings and Miles City in south-central Montana. The county seat is Hysham, a quiet agricultural town on the north bank of the Yellowstone. Despite its small size, Treasure County punches above its weight agriculturally — the Yellowstone River bottoms support productive irrigated hay and cattle operations, and the county’s entire economy revolves around agriculture. The Bighorn River enters the Yellowstone just upstream of the county’s western boundary, adding significant flow to the system.

Weather & Moisture

Treasure County has no SNOTEL stations and no Montana Mesonet soil moisture reporting — it is a low-elevation plains county entirely dependent on the Yellowstone River system and direct precipitation. The primary USGS gauge is the Bighorn River above Tullock Creek near Bighorn (06294500), which captures flows from the Bighorn River — a major Yellowstone tributary fed by snowmelt from the Bighorn Mountains in Wyoming and regulated by Yellowtail Dam (Bighorn Canyon). Precipitation in Treasure County averages 12 to 14 inches annually, making dryland farming marginal and irrigation from the Yellowstone essential for hay production.

Water Rights & Land Ownership

Water rights in Treasure County are concentrated along the Yellowstone River and its immediate tributaries. Irrigated agriculture on the Yellowstone bottoms depends on senior water rights for pump and ditch diversions from the river. The Yellowstone is Montana’s last undammed major river, meaning flows are unregulated on the mainstem — though the Bighorn River inflow is regulated by Yellowtail Dam. Water availability for Treasure County irrigators is generally reliable because the Yellowstone carries substantial volume even in dry years. The Montana DNRC WRQS provides access to the county’s water rights records.

Hay & Winter Feed

Irrigated alfalfa and grass hay along the Yellowstone River bottoms form the backbone of Treasure County’s agricultural output. The river’s reliable flow supports consistent hay production, making Treasure County a net hay producer in most years despite its small size. Dryland hay is not viable given the low precipitation. Irrigated hay from the Yellowstone corridor is the primary winter feed source for the county’s cattle operations.

Cattle Production

Cow-calf operations in Treasure County are concentrated along the Yellowstone River bottoms, with cattle grazing irrigated pasture and adjacent native range on the benchlands above the river. Operations here are well-positioned for winter feeding thanks to local irrigated hay. Fall-weaned calves typically sell through Billings sale barns (approximately 100 miles west) or at regional auctions in Miles City. Some calves move directly to feedlots in the Billings corridor.

County Logistics

Hysham sits on Interstate 94 approximately 100 miles east of Billings and 75 miles west of Miles City. I-94 parallels the Yellowstone River through the county, providing direct access to both Billings and Miles City livestock markets. Trucking to Billings runs approximately 1.5 hours — among the shortest hauls in eastern Montana. The county’s location on the I-94 / Yellowstone River corridor gives it better market access than many comparably sized eastern Montana counties.

Data Sources

• USDA Drought Monitor — weekly county drought classification
• USGS Water Services — Bighorn River above Tullock Creek near Bighorn (06294500) daily discharge
• NOAA NCEI Climate at a Glance — county precipitation anomaly (1/3/12 month)
• USDA NASS — county cattle inventory and agricultural census