Big Horn County in context

Adjacent counties in the the Bighorn-Yellowstone junction. Big Horn County shares the Bighorn River / Yellowtail reservoir system with these neighbors.

Click any neighbor for its full county dashboard.

Snowpack & Moisture Detail

SNOTEL station-by-station read for Big Horn County. The dashboard above gives current aggregate; this section shows where the water actually is.

Big Horn County’s irrigation water flows from the Bighorn River, which enters Montana from Wyoming through Bighorn Canyon before reaching the Hardin valley. The river’s flow is heavily regulated by Yellowtail Dam at Fort Smith, meaning Bighorn River water delivery into Hardin-area irrigation districts is as much a reservoir management decision as a snowpack outcome. [needs editorial] — update with current SNOTEL data each season.

Basin Index: Bighorn River below Yellowtail Dam at Fort Smith gauge is the operational flow index; Yellowtail reservoir storage level drives late-season irrigation availability. [needs editorial — update seasonally] Drought Monitor (valid 2026-06-02): D2 Severe across 16% of county; D1 Moderate across 84% of county. Total area in drought: 100% (valid 2026-06-02). Station snapshot as of June 04, 2026 — live dashboard above is current.

Two-Week Rainfall

Observed (prior 14 days) and forecast (next 14 days) · Big Horn County · as of 2026-06-04

Observed detail: 3 measurable-rain day(s) in the prior two weeks; largest single day 0.35 in.

Water Rights & Land Ownership

The Bighorn River enters Big Horn County through Bighorn Canyon from Wyoming and flows north through Fort Smith and Hardin before joining the Yellowstone near the Treasure County line. Yellowtail Dam at Fort Smith is the dominant water management infrastructure in the county, creating Lake Bighorn and regulating downstream flows.

Water rights on the Bighorn River in Big Horn County are complicated by the presence of the Crow Indian Reservation, which holds both tribal water rights under the Winters Doctrine and surface rights adjudicated under the Montana Water Court. The Crow Tribe’s reserved water rights are senior to most non-tribal agricultural claims in the basin, and any water shortage year triggers negotiations over delivery priority. Below Yellowtail Dam, the Bureau of Reclamation operates the Hardin Irrigation District, which supplies water to the most productive non-tribal farm ground in the county under a federal project right pool. Little Bighorn River, joining near Hardin from Wyoming, is separately adjudicated and is not regulated by Yellowtail — it is fully appropriated in its own right and subject to call from senior holders during low-flow periods. Stockwater wells on the high plains benches east of Hardin are the primary water source for cow-calf operations away from the river valleys.

Production & Sales

Operation character, hay base, and how cattle reach market from Big Horn County.

Cattle production

Big Horn County carries one of the larger cattle inventories in the corridor, with the Crow Reservation supporting extensive traditional cow-calf operations across its 2.3-million-acre land base. Non-tribal operations cluster along the Bighorn River valley near Hardin and along the I-90 corridor, running cow-calf and stocker programs on irrigated pasture and dry-land range. The Hardin livestock market historically handled significant volume from both tribal and non-tribal producers, though most large consignments now move to Billings. Dry-land bench country east toward the Powder River divide supports lower-density cow-calf operations dependent on stock dams and ephemeral draws for stockwater.

Hay & winter feed

Irrigated alfalfa in the Bighorn River valley near Hardin is the county’s primary hay base, with Bureau of Reclamation project water from Yellowtail Dam supporting two to three cuttings in normal years. First-cutting runs mid-June in the Hardin valley, earlier than the elevation counties to the west. Dry-land hay on the benches east of Hardin is limited and highly weather-dependent — in drought years, those operators are buyers in the Billings market rather than sellers. The Crow Reservation hay production is significant but primarily consumed internally by tribal ranchers rather than entering the commercial market.

Logistics · sale barns & trucking

Hardin at the I-90/US-87 junction is the county’s commercial hub, 46 miles east of Billings. The Montana Stockyards in Billings is the primary cattle marketing point for most Big Horn County operators, with trucking time under an hour from Hardin. US-212 east connects to the Crow Agency and Lame Deer corridor. Seasonal road conditions on reservation roads can restrict access to remote pastures in spring, and some tribal road easements require specific permits for non-tribal hauling. The Wyola area near the Wyoming border accesses northern Wyoming markets as a secondary option.