Wade4/100
Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
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Fly fishing report · West
Big Hole River
A Big Hole River report for Montana trout anglers checking Glen flow, drought restrictions, grayling conservation, hatches, access, and weather.
Check flow & weatherToday's river scoreHigh source confidence
39
Poor
Best option: Float.
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
Updated Jul 13, 11:17 PM UTCUsually refreshes about every 45 minutes
Recommended approachFloat
Mode scores adjust the river-wide score for the risks of wading, bank fishing, or floating.
Bank / edgeCheck
This report does not describe this as a primary mode. Verify legal access, depth, launches, and retreat options before planning around it.
Float · Best fit43/100
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
Water temperature above salmonid stress threshold
Confirm before you leave
Flow and weather right now.
Use the flow trend to confirm the score before you leave. Weather can change the safest and most productive fishing window.
Loading current flow and weather.
River strategy
Check restrictions before you chase the hatch.
The Big Hole is a premier Montana freestone river, but drought, temperature, runoff, grayling conservation, and float rules can be the first decision. Start with FWP restrictions and the Glen gauge.
- Use USGS Glen flow for this page; RiverReports coverage was not reliable enough to use as the visual source.
- Check FWP restrictions every time because hoot-owl and closure updates can change quickly.
- Stoneflies, caddis, PMDs, hoppers, and fall streamers all matter, but only when water conditions support trout handling.
- Respect Arctic grayling conservation and handle all trout quickly during warm or low water.
Why this score moved
Water temperatureLowers score
USGS water temperature is about 72F. Do not pressure trout or salmonids in warm water.
Best mode nowLowers score
Float: A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
FlowHelps score
USGS shows 954 cfs with a stable over about 6 hours trend. same-date USGS history (1998-2024, 27 readings) puts the normal middle range around 523 cfs-1,340 cfs. Flow is inside the same-date normal range, so weather, temperature, and access become the next checks.
SeasonHelps score
Early summer: Runoff drop, salmonflies, golden stones, caddis, and PMDs can be excellent.
Public alertsHelps score
No active NWS alert was returned for this forecast point.
Read the water
What changes the plan.
The best Big Hole days have stable post-runoff water, cool temperatures, and no active restriction that changes your plan. If temperatures climb or flows drop, fish early or choose another river.
Runoff edge
Use stonefly nymphs, streamers, and bank tactics only where clarity and safety allow.
Post-runoff stable
Prime dry-dropper, caddis, PMD, and stonefly fishing through riffles and banks.
Low and warm
Check restrictions, fish early if legal, and stop when trout handling is unsafe.
Fall cooling
Use BWOs, mahoganies, October caddis, and streamers in cloud cover.
Field plan
Fish it with intention.
Best flows
Use USGS 06026210 near Glen for the page's flow trend. Stable post-runoff water is the cleanest window; low warm water should trigger early fishing only if legal, quick handling, or a move to cooler water.
When to skip
Skip or move on when FWP restrictions are active for your timing, water temperature is unsafe for trout or grayling, flow is too low for an ethical float, or ranch-country access is unclear.
Local plan
Start with FWP restrictions and the Glen gauge. Then decide whether the day is a stonefly bank plan, a summer hopper float, an early-morning low-water session, or a fall streamer window.
Backup water
If the Big Hole is high, low, warm, restricted, or logistically awkward, compare the Bighorn for a steadier tailwater, the Bitterroot for another freestone option, or the Madison for a different Montana trout plan.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
March to AprilSkwalas, March Browns, BWOs, midgesSkwala dry, rubberleg, March Brown, BWO emerger, midge
Reviewed family · report says “Skwala dry”Skwala Stonefly PatternsSkwala is an insect and hatch label. Dark olive-brown nymphs and olive adult dries are materially different forms; seasonal timing also varies by watershed.See family guide ↗
Reviewed family · report says “rubberleg”Stonefly Nymph PatternsStonefly nymph patterns generally emphasize two tails, a broad thorax, segmented abdomen, and bottom contact; rubber legs, biots, beads, and jig hooks define different exact forms.See family guide ↗+ 3 more reviewed guides in the Fly Box May to JuneRunoff edge, salmonflies, golden stones, caddis, PMDsChubby Chernobyl, Pat's rubber legs, caddis, PMD, big streamer
Reviewed pattern · report says “Chubby Chernobyl”Chubby ChernobylIdentify the construction, not the color: a long foam overbody over a segmented dubbed underside, rubber legs at two tie-in stations, two distinct buoyant synthetic-yarn wing sections, and a short flash tail. The paired wing stations and layered foam-and-dubbing body separate the reviewed Chubby from the original Chernobyl Ant and from generic foam hoppers or beetles.See photos & how to fish it ↗
Reviewed pattern · report says “Pat's rubber legs”Pat's Rubber LegsA weighted long-shank nymph, variegated chenille body, two tails, and multiple pairs of long rubber legs identify the core form. Generic rubber-leg stoneflies remain a broader family, not automatic Pat's Rubber Legs matches.See photos & how to fish it ↗+ 3 more reviewed guides in the Fly Box July to AugustHoppers, ants, beetles, nocturnal stones, spruce moths where presentHopper-dropper, foam ant, beetle, nocturnal stone, small nymph
Reviewed family · report says “foam ant”Ant PatternsAnt patterns can be foam, fur-bodied, winged, or sunken. The narrow waist and paired body lobes matter more than one material recipe.See family guide ↗
Reviewed family · report says “beetle”Beetle PatternsBeetle flies range from simple foam shells to hair-bodied and sunken forms. A rounded back and compact profile distinguish the family from ants and hoppers.See family guide ↗+ 2 more reviewed guides in the Fly Box September to OctoberMahoganies, BWOs, October caddis, baitfish, fall streamersBWO, mahogany dun, October caddis, sculpin, leech
Reviewed family · report says “BWO”Blue-Winged Olive PatternsBWO describes a hatch group, not one fly. Nymph, emerger, dry, cripple, and spinner profiles must stay separate because they occupy different parts of the water column.See family guide ↗
Reviewed family · report says “mahogany dun”Isonychia and Mahogany Dun PatternsIsonychia nymphs are active swimmers; emergers, parachute or other dry forms, and spinners occupy different levels. Mahogany Dun can be regional hatch wording, so it does not identify one exact fly recipe.See family guide ↗+ 3 more reviewed guides in the Fly Box 01
Read FWP restriction pages before checking fly boxes; the river may not be fishable all day.
02
During stonefly season, fish banks, soft edges, and buckets with large dries or rubberlegs.
03
Use hopper-dropper rigs in summer only when water temperature and restrictions allow trout fishing.
04
Float plans should include verified put-ins, take-outs, and enough time for wind or low flow.
05
Handle grayling and trout quickly, keep fish wet, and avoid unnecessary photos during warm water.
Access & responsibility
Know the entry. Know the exit.
Montana FWP regulations, current waterbody closures, hoot-owl restrictions, and access-site rules control the Big Hole plan. Check them before fishing.
Melrose and Maiden Rock area
Common middle-river planning corridor with FWP access-site checks.
Glen gauge reach
Primary flow reference for this report and a useful middle-river trend.
FWP fishing access sites
Use official FishMT pages for site status, rules, and float logistics.
Transparent sources
Check the facts behind the plan.
Last material review: 2026-07-06
Common questions
Before you leave.
What should I check first before fishing the Big Hole River?+
Check Montana FWP restrictions, Glen flow, water temperature, access-site status, and weather before fishing.
Are there special regulations on the Big Hole River?+
Yes. Montana regulations plus current restrictions or hoot-owl closures can change the day.
Is the Big Hole River a good fly-fishing river?+
Yes, if you match the reach, season, target species, water temperature, and current access rules. This report is built to help you choose that plan.
What flies should I bring for the Big Hole River?+
Bring the hatch-chart flies, confidence nymphs, and a backup streamer or warmwater box so you can adjust to flow, clarity, and temperature.
How should I plan access for the Big Hole River?+
Use FWP fishing access sites and legal float/wade access. Ranch banks and informal pullouts are not automatically public.