For the fly fisher seeking solitude, stunning scenery, and genuinely wild trout, the Ruby River in southwestern Montana delivers all three in abundance. Rising in the Gravelly Range and flowing northeast through the Ruby Valley before meeting the Beaverhead River near Twin Bridges, the Ruby is one of Montana most underappreciated trout streams — offering exciting dry fly fishing with a fraction of the pressure found on its more famous neighbors.
The Ruby River divides naturally into two distinct sections separated by Ruby Reservoir. Above the reservoir, the upper Ruby flows through Beaverhead-Deerlodge National Forest, carrying small to mid-sized rainbow trout, cutthroat, and the increasingly rare Arctic grayling in clear, fast water. This section is a true mountain stream experience — wade-friendly, remote, and rewards attractor dry flies fished with confidence. The best access concentrates near Cottonwood Campground south of Alder; outside national forest land, private ownership closes most of the upper river.
Below Ruby Reservoir, the river functions as a modest tailwater for roughly 48 miles to Twin Bridges. The release from the dam moderates temperatures and supports a healthy brown trout population averaging 10 to 14 inches, with 18-to-20-inch fish not uncommon for anglers willing to work precise presentations. Five public fishing access sites on the lower river provide legal entry points through predominantly private agricultural land. Montana stream access law allows wading within the ordinary high-water mark, but ingress must occur at designated access points.
Fishing pressure on the Ruby is genuinely light — a rarity in Montana southwest corner. The trout here are less jaded than those on the heavily-fished Beaverhead or Madison. Small Adams, Royal Wulff, Stimulator, and Elk Hair Caddis in size 16 produce consistent action in the upper section. The lower river responds well to hopper patterns during late summer and streamer fishing for the largest browns, particularly in early morning and evening. Tricos fish well in late summer on the lower section during the morning spinner falls.
Private landowners along much of the Ruby — particularly in the middle section — are notoriously protective of their property. Respect posted signage, use only designated access sites, and keep a low profile to preserve access for future anglers. The scenic payoff is worth the effort: the Ruby Valley, flanked by the Ruby Range and the Tobacco Root Mountains, rivals any mountain landscape in Montana for sheer beauty.
Virginia City, the historic gold rush town, is the nearest community, with Twin Bridges offering additional services. Frontier Anglers in Dillon and Montana Angler provide guided trips and current fishing reports for the Ruby.
