WadeNeed data
This report does not describe this as a primary mode. Verify legal access, depth, launches, and retreat options before planning around it.
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Fly fishing report · West
Lower Clark Fork River
A Lower Clark Fork report for anglers checking St. Regis flow, big-river access, trout and warmwater transitions, restrictions, and weather.
Check flow & weatherToday's fishing decisionMost live data available
69
Use caution
Lower Clark Fork River is a cautious call right now.
An Air Quality Alert is active near this forecast point, so the score is capped at caution until smoke and access conditions are checked. NWS alert: Air Quality Alert issued August 2 at 9:12AM MDT by NWS Great Falls MT.
Best supported approachFloat
Watch nextPublic alert: An Air Quality Alert is active near this forecast point, so the score is capped at caution until smoke and access conditions are checked. NWS alert: Air Quality Alert issued August 2 at 9:12AM MDT by NWS Great Falls MT.
Updated Aug 3, 2:54 AM UTCUsually refreshes about every 45 minutes
Best supported approachFloat
Compare wading, bank fishing, and floating before choosing how you will fish.
Bank / edge61/100
Bank and edge fishing is the safer default when water is high, pushy, or not fully verified.
Float · Best fit73/100
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
Check before you drive
Current flow and weather.
Look at whether the river is rising or falling, then check wind, rain, and storms. These can change both safety and fishing.
Loading current flow and weather.
Before you rely on this report
How current is this report?
Conditions can change quickly. Check these dates before you decide to fish, and open the official source when safety or rules matter.
- River conditions
- Checked Aug 2, 2026, 10:54 PM
- Fishing guidance
- Reviewed May 31, 2026
- Public access
- No reviewed map pin available
- Rules and closures
- Official rule links checked
High confidence in the current score inputs.
6 sources are listed below for you to open.
3 public access records are listed. Private spots are never shown.
Source checked Jul 30, 2026
Plan your access
Know where you can enter.
These are public parking, launch, trail, or recreation areas—not secret fishing spots. We never show an angler's private pins, notes, or photos here.
- 0
- Shown on map
- 3
- No map pin
Location checkedDescription only
01No map pin
Area description
St. Regis flow reach
Primary river-flow anchor for this Lower Clark Fork page.
Restrictions and seasonal notes
Do not assume every lower-river bank is public. Use FWP access information and Montana stream-access rules.
Dams, reservoirs, and wind can change boat safety and fish behavior downstream.
02No map pin
Boat launch
Superior and Plains corridor
Large-river access and boat logistics become more important downstream.
Restrictions and seasonal notes
Do not assume every lower-river bank is public. Use FWP access information and Montana stream-access rules.
Dams, reservoirs, and wind can change boat safety and fish behavior downstream.
03No map pin
Boat launch
Thompson Falls and reservoir sections
A different, dam-influenced plan with more warmwater and boat considerations.
Restrictions and seasonal notes
Do not assume every lower-river bank is public. Use FWP access information and Montana stream-access rules.
Dams, reservoirs, and wind can change boat safety and fish behavior downstream.
How to fish it
Confirm which lower reach you mean.
The lower Clark Fork changes from river reaches near St. Regis and Superior to dam and reservoir-influenced water farther downstream. This page uses St. Regis as the flow anchor and keeps the planning reach explicit.
- Use the St. Regis gauge for the river reach, and do not apply it blindly to reservoir sections.
- Expect a mix of trout, pike, bass, and reservoir influence depending on how far downstream you go.
- Check FWP rules, current restrictions, and consumption guidance before harvest.
- Large water, wind, and dams make boat and wading plans more serious than casual roadside fishing.
Why the score looks this way
Public alertUse caution
An Air Quality Alert is active near this forecast point, so the score is capped at caution until smoke and access conditions are checked. NWS alert: Air Quality Alert issued August 2 at 9:12AM MDT by NWS Great Falls MT.
FlowHelps score
USGS shows 3,010 cfs with a stable over about 6 hours trend. Today's flow is within the normal seasonal range of 2,500 cfs to 4,480 cfs. Weather, water temperature, and access are the next checks.
SeasonHelps score
Early summer: Runoff drop and caddis or stonefly activity can improve river reaches.
WeatherHelps score
The NWS forecast is about 69F with Patchy Smoke.
Fishing usefulnessHelps score
Skip or pivot when the exact lower reach is unclear, FWP restrictions are active, wind makes the boat plan unsafe, water is too warm for trout handling, or public access and takeout details are not confirmed.
Read the water
What changes the plan.
Fish the lower Clark Fork when flow is stable, visibility is good, and you have a reach-specific access plan. If the river is high, hot, windy, or unclear, choose a colder tributary or a smaller reach.
Stable river flow
Fish seams, bars, side channels, and bank structure with nymphs, dries, or streamers.
High water
Avoid heavy wading and focus on protected banks only if safe.
Warm lower water
Check temperature and shift away from trout if handling would be stressful.
Reservoir influence
Treat slower sections as a different fishery with wind, boat, and species changes.
Your trip plan
Know when to go—and when to skip it.
Best flows
Use RiverReports and USGS 12354500 at St. Regis for the river reach, and avoid applying that gauge blindly to reservoir-influenced water farther downstream. Stable visibility is the best trout window; warm or slow lower water can shift the target to warmwater species.
When to skip
Skip or pivot when the exact lower reach is unclear, FWP restrictions are active, wind makes the boat plan unsafe, water is too warm for trout handling, or public access and takeout details are not confirmed.
Local plan
Start by deciding whether the day is a St. Regis river plan, a Superior-area float, or a lower dam-influenced trip. Then match flies, leaders, and species expectations to that exact reach.
Backup water
If the Lower Clark Fork is warm, windy, unclear, or too reservoir-influenced for the goal, compare the Blackfoot for colder freestone water, the main Clark Fork near Missoula for a more familiar town reach, or Rock Creek for a wade-focused trout plan.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
March to AprilSkwalas, March Browns, BWOs, midges, and early stonefly movementSkwala dry, rubberleg, March Brown, BWO emerger, zebra midge
Fly family · report suggests “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 ↗
Fly family · report suggests “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 edges, salmonflies, golden stones, caddis, PMDsChubby Chernobyl, Pat's rubber legs, caddis pupa, PMD emerger, streamer
Fly pattern · report suggests “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 ↗
Fly pattern · report suggests “Pat's rubber legs”Pat's Rubber LegsThe core Pat's Rubber Legs architecture is a long weighted stonefly nymph with a chenille body, two rubber tails, a pair of antennae, and multiple long flexible legs. Pat Bennett's documented 1995 form used true-brown chenille and true-olive Super Floss; coffee-and-black became a familiar later guide treatment. Beads, jig hooks, thoraxes, wing cases, articulated bodies, white legs, and other colors are explicit variations—not silent parts of one universal recipe.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 perdigon
Fly family · report suggests “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 ↗
Fly family · report suggests “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 streamer windowsMahogany, BWO, October caddis, sculpin, leech
Fly family · report suggests “Mahogany”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 ↗
Fly family · report suggests “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 ↗+ 3 more reviewed guides in the Fly Box 01
Decide whether you are fishing a river reach or reservoir-influenced water before rigging.
02
Fish soft inside current, drop-offs, side channels, and bank seams on stable flows.
03
Use streamers for browns and pike in deeper or stained water.
04
On warm days, target smallmouth or pike instead of stressing trout in marginal temperatures.
05
If floating, account for wind, distance, takeouts, and dam-influenced water.
Rules & closures
Check the official rules before you go.
Open the agency page to confirm the exact river section, species, season, tackle rules, limits, and emergency closures.
Official links checkedRules for this river or sectionNo special rule found
We did not find a special rule for this river.
We checked the state source but did not find a clearly supported exception for this river. Check the official rules for the exact section you plan to fish.
Rules checkedJul 30, 2026
Report a correction ↗Always follow the official rule
This summary helps with trip planning. The linked agency rule is the one you must follow.
Updates from anglers
What anglers are seeing.
Recent observations from general areas of Lower Clark Fork River. We review every update before it appears and never publish exact fishing spots, private access details, or photo locations.
Angler updates are not loading right now.
You can still use the river plan above. Check back later for recent observations from other anglers.
Where this report comes from
Open the sources we checked.
Fishing guidance checked: May 31, 2026
Site check: Jul 14, 2026. We regularly test report links, live scores, flow and weather data, and page loading. The content date changes only when the fishing guidance or its sources change.
Common questions
Before you leave.
What should I check first before fishing the Lower Clark Fork River?+
Check the St. Regis gauge, exact reach, FWP restrictions, weather, access, and any harvest or consumption guidance.
Are there special regulations on the Lower Clark Fork River?+
Yes. Lower Clark Fork rules vary by reach and species, especially as the river transitions toward reservoir water.
What flies should I bring for the Lower Clark Fork River?+
Bring the hatch-chart flies, a few confidence nymphs, and a streamer box. Then adjust for water temperature, clarity, and the insects you actually see.
Can I wade the Lower Clark Fork River?+
Some edges are wadeable, but it is big water. Use official access and avoid assuming private banks are available.
When should I skip the Lower Clark Fork River?+
Skip it when flows are unsafe, temperatures stress trout, wildfire or emergency closures are active, or legal access for the reach is not clear.