Madison County, Montana

Overview

Madison County is a southwest Montana ranching and mountain-valley county anchored by Virginia City (the historic county seat) and Ennis (the main commercial center). The county is defined by the Madison River — one of the three headwater rivers of the Missouri — and is home to the Madison Valley, the Ruby Valley, and a portion of the Big Hole. Agriculture is dominated by large cow-calf operations supported by irrigated hay production in the river valleys. Madison County contains historic mining districts (Virginia City and Nevada City are preserved gold-rush-era towns), and is a major destination for fly-fishing tourism on the Madison River.

Weather & Moisture

Madison County has seven NRCS SNOTEL stations tracking snowpack in the Tobacco Root Mountains, the Madison Range, the Gravelly Range, and the Ruby Mountains — good coverage by any measure. Water supply derives from snowpack in these ranges feeding the Madison River, the Ruby River (regulated by Ruby Reservoir), the Beaverhead River (which flows through the northwest corner of Madison County near Twin Bridges), and the Big Hole River (which also passes through the west edge of the county).

Water Rights & Land Ownership

Water rights in Madison County are centered on the Madison River (one of Montana’s most-studied rivers given its fisheries value, supporting senior irrigation rights dating to the territorial era), the Ruby River (regulated by Ruby Reservoir and subject to a long-running public-access-versus-private-rights debate), and the Big Hole and Beaverhead river systems where they cross the county’s western edge. Montana DNRC WRQS is the primary research tool.

Hay & Winter Feed

The Madison Valley and Ruby Valley produce substantial irrigated grass and alfalfa hay, supporting both local cow-calf operations and regional market demand. Hay production here is among Montana’s more reliable given the mountain-valley irrigation base.

Cattle Production

Madison County is one of Montana’s significant cow-calf counties, with large commercial operations in the Madison, Ruby, and Big Hole valleys. Summer range on the Beaverhead-Deerlodge National Forest and BLM allotments supports valley-wintering operations. Fall-weaned calves typically move through the Dillon Livestock Auction (Beaverhead County) or video sales.

County Logistics

Ennis sits on US-287 approximately 60 miles south of Bozeman and 70 miles north of West Yellowstone. Virginia City (the county seat) is a few miles southwest of Ennis on Montana Highway 287. Interstate 90 access via Three Forks or Bozeman is the main route for truck commerce; trucking to Billings runs approximately 3.5 hours via US-287 / I-90.

Data Sources

• USDA NRCS National Water and Climate Center — SNOTEL daily SWE (7 stations including Albro Lake, Clover Meadow, Divide)
• USDA Drought Monitor — weekly county drought classification
• USGS Water Services — Beaverhead River near Twin Bridges (06018500) daily discharge
• Montana Mesonet (UMT) — soil moisture (Twin Bridges S)
• NOAA NCEI Climate at a Glance — county precipitation anomaly (1/3/12 month)
• USDA NASS — county cattle inventory and agricultural census