Wade · Best fit73/100
Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.
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Fly fishing report · Midwest
Wisconsin River Upper
A Northwoods warmwater report for the Upper Wisconsin, built around DNR water data, Rainbow Flowage flow, access caution, and bass, pike, musky, and walleye tactics.
Check flow & weatherToday's river scoreHigh source confidence
73
Good
Best option: Wade.
Wading is in play only where your chosen access has clear footing, legal entry, and no forced crossings.
Updated Jul 13, 11:17 PM UTCUsually refreshes about every 45 minutes
Recommended approachWade
Mode scores adjust the river-wide score for the risks of wading, bank fishing, or floating.
Bank / edge73/100
Bank and edge fishing remains a practical low-commitment option if access is legal and footing is safe.
Float73/100
A float is in play where this report supports boat access and wind, releases, and shuttle logistics are manageable.
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
Treat this as warmwater Northwoods river fishing, not a trout hatch page.
The Upper Wisconsin is best planned as a bass, walleye, pike, and musky fly-fishing river with flowage and dam influence. The DNR segment reviewed for this page is not classified trout water, so the value is practical warmwater tactics plus current flow checks.
- Use Rainbow Lake for upper-river flow context and Merrill as downstream backup context.
- Focus on current seams, wood, rock, bridge shade, and flowage mouths instead of trout-style riffle hatches.
- Carry bigger streamers if pike or musky are possible, but handle them with proper tools.
- Check Wisconsin DNR regulations and fish-consumption guidance before keeping fish.
Why this score moved
HeatUse caution
The NWS forecast is near 95F. Fish early and verify water temperature where trout stress is possible.
Public alertUse caution
A heat alert is active near this forecast point, so the score is capped until water temperature and fish-handling risk are checked. NWS alert: Heat Advisory issued July 13 at 2:57PM CDT until July 14 at 9:00PM CDT by NWS Green Bay WI.
FlowHelps score
USGS shows 471 cfs with a stable over about 6 hours trend. same-date USGS history (1936-2025, 90 readings) puts the normal middle range around 454 cfs-785 cfs. Flow is inside the same-date normal range, so weather, temperature, and access become the next checks.
SeasonHelps score
Summer: Low-light topwater for smallmouth; bigger fish often use shade and deeper edges.
Fishing usefulnessHelps score
Skip or change the plan when dam-influenced levels are changing fast, storms threaten open flowage water, boat traffic is heavy, pike or musky release tools are missing, or harvest plans have not been checked against regulations and fish-consumption advice.
Read the water
What changes the plan.
Good fly windows are stable spring and fall flows, summer low-light topwater sessions, and cooling fall streamer days. Skip unsafe dam pulses, storms, and heavy boat-traffic windows.
Stable moderate flow
Best all-around window for streamers, crayfish, and poppers around structure.
Low clear summer water
Fish early and late; use stealth, shade lines, and smaller baitfish patterns.
High or rising water
Avoid wading and fish from safer banks or boats only when conditions are controlled.
Warm bright afternoons
Shift to deeper shade, flowage edges, or plan a dawn/evening session.
Field plan
Fish it with intention.
Best flows
Use USGS 05391000 at Rainbow Lake for upper flowage context and USGS 05395000 at Merrill for broader downstream context. Stable or slowly changing levels are easiest for fly fishing structure.
When to skip
Skip or change the plan when dam-influenced levels are changing fast, storms threaten open flowage water, boat traffic is heavy, pike or musky release tools are missing, or harvest plans have not been checked against regulations and fish-consumption advice.
Local plan
Choose the structure type first: flowage mouth, bridge shade, boulder edge, wood, or slow bank pocket. Then pair the relevant gauge, weather, rules, and boat or bank access with the right line and fly size.
Backup water
If the Upper Wisconsin is high, stormy, boat-heavy, or logistically uncertain, compare Wisconsin River, Flambeau River, or Tomorrow River before forcing the same plan.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
April to MayWarming smallmouth water, minnows, crayfish, caddis, and bank insectsClouser, crayfish, hellgrammite, swimming nymph, small popper
Reviewed pattern · report says “Clouser”Clouser Deep MinnowThe reviewed chartreuse-and-white form uses sparse layered bucktail with flash around lead barbell eyes. The eyes make the fly sink between strips and ride hook point up; color, eye weight, hook, and saltwater materials must remain labeled.See photos & how to fish it ↗
Reviewed family · report says “crayfish”Crayfish and Crawfish PatternsCrayfish patterns differ in claw size, eye placement, shell profile, leg motion, weighting, hook orientation, and snag resistance. Rust, brown, olive, tan, and pale molting colors remain labeled choices rather than aliases for one recipe.See family guide ↗+ 3 more reviewed guides in the Fly Box June to AugustLow-light topwater, damselflies, hoppers, cicadas, crayfish, and baitfishFoam popper, slider, cicada, hopper, baitfish streamer, crayfish
Reviewed family · report says “Foam popper”Bass and Panfish Popper PatternsPoppers may use cupped foam, cork, balsa, deer hair, or pencil-shaped heads. Head face, size, buoyancy, tail, legs, and weed guard determine sound and action; a generic popper label does not identify one fly.See family guide ↗
Reviewed family · report says “slider”Warmwater Slider and Diver PatternsA slider has a tapered, flat, or softly shaped head that glides or pushes a small wake with limited noise. A diver has an angled, collared, folded, or otherwise shaped head that pulls below the surface when stripped and rises on the pause. Frog, baitfish, and large-insect profiles can be tied on either idea, so the exact head action, buoyancy, hook orientation, weed guard, and material must stay named.See family guide ↗+ 4 more reviewed guides in the Fly Box September to OctoberCooling water, baitfish movement, crayfish, and steady streamer fishingBaitfish streamer, crayfish, olive bugger, soft hackle, hellgrammite
Reviewed family · report says “Baitfish streamer”Baitfish and Minnow PatternsBaitfish and minnow wording does not identify one fly. Local forage size and shape, flash, body depth, hook orientation, and weighting distinguish shiner, smelt, dace, sculpin, and general minnow imitations.See family guide ↗Reviewed family · report says “crayfish”Crayfish and Crawfish PatternsCrayfish patterns differ in claw size, eye placement, shell profile, leg motion, weighting, hook orientation, and snag resistance. Rust, brown, olive, tan, and pale molting colors remain labeled choices rather than aliases for one recipe.See family guide ↗+ 3 more reviewed guides in the Fly Box November to MarchDeep winter holding water, small baitfish, midges, and limited warmwater windowsSmall streamer, dark leech, jig bugger, crayfish, midge
Reviewed family · report says “Small streamer”Trout Streamer PatternsStreamer is a method-and-silhouette family, not a recipe. Size, color, weight, and presentation phrases stay visible, while baitfish, leech, sculpin, Woolly Bugger, and articulated identities link to their more specific destinations when known.See family guide ↗
Reviewed family · report says “dark leech”Leech PatternsLeech patterns share an elongated moving silhouette, but material, weighting, hook orientation, and retrieve vary. Pine-squirrel, rabbit-strip, balanced, and Woolly Bugger forms remain separately labeled rather than being presented as one recipe.See family guide ↗+ 3 more reviewed guides in the Fly Box 01
Fish poppers across soft banks at dawn, then switch to crayfish and baitfish patterns as light rises.
02
Use sink-tip lines near deeper boulder slots and bridge shade when the river is bright.
03
Cover water in short angles; warmwater fish often sit on one precise current edge.
04
Keep pike and musky tools ready before casting big flies, not after a fish eats.
05
Do not force trout tactics onto this river; structure, bait, temperature, and current matter more.
Access & responsibility
Know the entry. Know the exit.
Check current Wisconsin DNR fishing regulations before fishing or keeping fish. This page is scoped as warmwater mainstem water, not an inland trout stream.
Rainbow Flowage and Lake Tomahawk context
Use the USGS Rainbow Lake gauge for upper-river flow context.
Rhinelander and Boom Lake area
DNR fisheries context supports warmwater planning around this upper-river section.
Merrill downstream context
Use the Merrill gauge as a broader downstream check, not as the only upper-river truth.
Transparent sources
Check the facts behind the plan.
Last material review: 2026-07-06
regulationWisconsin fishing regulationsregulationWisconsin 2026-2027 new fishing regulationsconsumptionWisconsin fish consumption advicebackgroundWisconsin DNR water detail for upper Wisconsin River segmentbackgroundWisconsin DNR Boom-Rhinelander fisheries reportflowUSGS Wisconsin River at Rainbow Lake 05391000flowUSGS Wisconsin River at Merrill 05395000safetyNational Weather Service forecast point near RhinelanderaccessWisconsin DNR Fishing Finder access map
Common questions
Before you leave.
What should I check before fishing Wisconsin River Upper?+
Wisconsin DNR rules, water-detail notes, boat access, recent dam flow, storms, and fish-consumption advice
Which flow should I use for Wisconsin River Upper?+
Use USGS 05391000 at Rainbow Lake for the upper flowage reach, and check USGS 05395000 at Merrill when you need downstream mainstem context.
Where should I start on Wisconsin River Upper?+
Start with public landings, bridge approaches, and DNR water-detail context around Rainbow Flowage, Rhinelander, and Merrill, then confirm local access before parking.
Can I wade Wisconsin River Upper?+
Sometimes in shallow edge water, but do not treat the Upper Wisconsin like a small trout stream. Use a boat or bank plan when flows, depth, or releases are uncertain.