Big Hole River
OptimalMontana
Current Conditions
The Big Hole River is running at 663 CFS — ideal conditions. Expect clear water and excellent dry fly opportunities.
Last updated: Apr 6, 2026, 7:30 PM from USGS gauge 06024540 (Big Hole River near Melrose)
7-Day Flow Trend
Flow thresholds: Optimal 500–1200 CFS | Fishable to 2500 CFS | Marginal to 4000 CFS
Water Temperature
Water temperature is cool — ideal for trout activity. Fish will be feeding actively throughout the day.
About the Big Hole River
The Big Hole is Montana's last river to hold a wild population of fluvial Arctic grayling. From its headwaters in the Pioneer Mountains to its confluence with the Beaverhead, it offers uncrowded fishing in a stunning mountain valley setting.
Hatch Chart
| Insect | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Salmon Fly Chubby Chernobyl #6 | ||||||||||||
Golden Stonefly Stimulator #8 | ||||||||||||
Caddis Elk Hair Caddis #14 | ||||||||||||
Blue-Winged Olive BWO Parachute #18 | ||||||||||||
Hopper Dave's Hopper #8 |
Active Hatches — April
Patterns: BWO Parachute #18, RS2 #20
River Sections
Upper Big Hole
wade access663 CFS
High-altitude meadow water with Arctic grayling and small trout. Beautiful wading in open ranch country.
Divide to Melrose
wade/float access1,360 CFS
The heart of the Big Hole. Excellent dry fly water with good hatches. Famous salmon fly hatch in late June.
Guides on the Big Hole River(41)
These fishing guides list the Big Hole River as one of their home waters.
Backcountry Montana Adventures
Dillon, Montana
Backcountry Angler
Dillon, Montana
Big Sky Expeditions
Helena, Montana
Castabout Guide Service
Livingston, Montana
Craig Fellin Outfitters & Big Hole Lodge
Wise River, Montana
David Kumlien, Outfitter
Bozeman, Montana
Fishtales Outfitting
Sheridan, Montana
Flatline Outfitters
Twin Bridges, Montana
Ford Creek Guest Ranch
Augusta, Montana
Iron Wheel Guest Ranch
Whitehall, Montana
Iron Wheel Outfitters
Whitehall, Montana
Jack River Outfitters
McAllister, Montana
Frequently Asked Questions
What is the best time to fish the Big Hole River?+
The Big Hole River fishes well from spring through fall. Peak dry fly season is typically June through September. The salmon fly hatch in late June/early July is one of the year's most exciting events. Fall brings excellent streamer fishing and fewer crowds.
What flies work on the Big Hole River in April?+
In April, the Big Hole River sees Blue-Winged Olive activity. Top patterns include BWO Parachute #18. Always carry a selection of nymphs as well.
How many fishing guides operate on the Big Hole River?+
Avonture lists 41 fishing guides who operate on the Big Hole River. These guides offer local knowledge of hatches, access points, and current conditions that can significantly improve your experience.
What is the current flow on the Big Hole River?+
The Big Hole River's flow data is updated every 30 minutes from USGS gauge stations (waterdata.usgs.gov). Check the top of this page for current CFS readings, fishability status, and a 7-day flow trend chart. Optimal fishing flows are 500–1200 CFS.
What fish species are in the Big Hole River?+
The Big Hole River primarily holds wild brown trout and rainbow trout. Cutthroat trout may also be present in some sections. Fish sizes vary by section, with tailwater reaches typically holding larger fish.
Quick Conditions
Fishability Thresholds