Wade11/100
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
South Fork Snake River at Lorenzo
A lower South Fork Snake planning page centered on Byington, Lorenzo, and Menan access, where downstream float length, wind, and the Lorenzo gauge matter more than famous upper-river hype.
Check flow & weatherToday's river scoreHigh source confidence
31
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 / edge23/100
Bank and edge fishing is the safer default when water is high, pushy, or not fully verified.
Float · Best fit35/100
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
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
Fish the lower South Fork like a downstream float problem, not an upper-river postcard.
The Lorenzo reach becomes useful when the lower-river gauge, boat access, and weather all line up for a realistic float or edge-wade day. It loses value when you bring upper-canyon expectations to wider, wind-prone water or ignore how much the takeout plan shapes the fishing day.
- Use RiverReports first, then confirm the lower-river trend with USGS 13038500 near Lorenzo before choosing float length or wade emphasis.
- Idaho Fish and Game's South Fork Snake planner is still the regulation anchor here, especially for the no-harvest rule on Yellowstone cutthroat trout.
- BLM's Lorenzo and Byington access pages plus the South Fork Snake boating-access map are the clearest official route-planning sources for this stretch.
- If wind or release volume turns the lower river into a rowing day, shorten the float, fish near the access lanes, or move to a smaller river instead of forcing it.
Why this score moved
HeatLowers score
The NWS forecast is near 95F. Without live water temperature, heat risk needs a conservative check.
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.
FlowUse caution
USGS shows 8,350 cfs with a falling about 11% over about 6 hours trend. same-date USGS history (1925-2025, 50 readings) puts normal around 6,710 cfs and the upper quartile near 8,080 cfs; today's flow is high for the date. Fishable water may exist, but do not rate it highly without a safe access, clarity, and wading or boat plan.
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: Extreme Heat Warning issued July 13 at 2:50AM MDT until July 13 at 9:00PM MDT by NWS Pocatello ID.
SeasonHelps score
Early summer: A strong window for float-driven dry-dropper and nymph fishing after runoff settles into readable lanes.
Read the water
What changes the plan.
This page is strongest when you want a lower South Fork option that still benefits from the tailwater fishery but does not require an upper-canyon launch. The best days come from matching the Lorenzo gauge to a realistic shuttle and weather window.
Stable moderate lower-river flow
Best for practical floats, softer side seams, and selective bank fishing near access sites.
High release
Treat the day as boat-first and avoid pretending wide lower-river shelves are easy wades.
Low clear late-season flow
Fish longer leaders and lean on banks, side channels, and lower-light windows.
Afternoon wind
Shorten the float plan, simplify rigs, and expect open-water casting angles to get worse fast.
Field plan
Fish it with intention.
Best flows
Steady moderate lower-river flows that still leave side seams, bank lanes, and manageable drift speed instead of turning the whole reach into transport water.
When to skip
Skip when afternoon wind dominates the row, when higher releases erase safe edge fishing, or when your shuttle window is too short for a calm lower-river float.
Local plan
Check the Lorenzo gauge early, pick Byington-to-Lorenzo or Lorenzo-to-Menan based on wind and time, and keep the fishing plan tied to the takeout instead of to wishful mileage.
Backup water
If the lower South Fork is too windy or too pushy, shorten the day to one access point, move upstream to a different South Fork section, or switch to Henry's Fork or Portneuf after checking current conditions.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
SpringBWOs, midges, and skwala windowsBWO emerger, zebra midge, soft hackle, skwala dry
Reviewed family · report says “BWO emerger”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 pattern · report says “zebra midge”Zebra MidgeLook for a very slim tapered thread body, evenly spaced contrasting wire rib, a small bead, and no tail or wing. The reviewed classic is black with silver wire and a silver bead. Red, olive, brown, glass-bead, jig-hook, resin-coated, or tailed forms must remain labeled variations rather than replacing the classic identity.See photos & how to fish it ↗+ 2 more reviewed guides in the Fly Box Early summerGolden stones, PMDs, caddisChubby, golden stone nymph, PMD cripple, elk hair caddis
Reviewed pattern · report says “Chubby”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 family · report says “golden stone nymph”Golden Stonefly PatternsGolden stonefly wording may describe the insect, nymph, or dry. Nymph tones can range from yellow-gold to amber and brown, while adult patterns require a distinct winged surface silhouette.See family guide ↗+ 2 more reviewed guides in the Fly Box Late summerHoppers, ants, caddis, beetlesHopper, ant, beetle, caddis dry, perdigon
Reviewed family · report says “Hopper”Grasshopper PatternsHopper patterns share a substantial body and long rear-leg impression, but foam, deer hair, wing construction, and waterline differ widely among named patterns.See family guide ↗
Reviewed family · report says “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 ↗+ 3 more reviewed guides in the Fly Box FallBWOs, midges, and streamersParachute BWO, RS2, zebra midge, olive bugger
Reviewed family · report says “Parachute 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 pattern · report says “RS2”RS2Start with the beadless architecture: two dark-dun Microfibett tails separated behind a slim, tightly twisted and visibly segmented dubbed abdomen; a fuller thorax; and saddle-hackle web clipped into a short angled wing bud. Rim Chung's original-style form uses natural beaver dubbing and hackle web. CDC- or Antron-wing ties, beads, curved hooks, flash, and tailless Avatar-style flies must remain labeled variations.See photos & how to fish it ↗+ 2 more reviewed guides in the Fly Box 01
Choose the launch and takeout before you rig rods because the lower South Fork fishes differently when the shuttle is rushed.
02
Use the main current as transport and fish the softer banks, side channels, and protected seams that actually let the fly work.
03
If the wind starts to own the boat, shorten the day instead of pushing a heroic lower-river mileage plan.
04
Near ramps, treat wading as a selective edge-fishing option rather than proof that the whole reach is easy to cover on foot.
Access & responsibility
Know the entry. Know the exit.
Idaho Fish and Game lists the South Fork Snake with a 6-trout limit but no harvest of Yellowstone cutthroat trout or kokanee. Tributary closure language can differ from the mainstem, so check the current planner before you add side-stream water to the day.
Byington
A key upstream launch or mid-river planning anchor when you want to avoid overextending the float.
Lorenzo Access
The clearest named lower-river BLM access reference for this page and its gauge context.
Menan Buttes area
A practical downstream public endpoint when you want a fuller lower-corridor plan.
Transparent sources
Check the facts behind the plan.
Last material review: 2026-06-02
flowRiverReports: South Fork Snake River at LorenzoflowUSGS monitoring location: Snake River near LorenzoregulationIdaho Fishing Planner: South Fork Snake RiveraccessBLM South Fork of the Snake River: Lorenzo Boat AccessaccessBLM South Fork of the Snake River: Byington Boat AccessaccessBLM South Fork of the Snake boating access guideaccessIdaho Fish and Game: Menan Buttes accesssafetyNational Weather Service forecast point near Lorenzo
Common questions
Before you leave.
What is the most important Lorenzo check?+
Start with RiverReports and USGS 13038500 near Lorenzo, then decide whether the lower-river flow and wind still support the float length you want.
Is this reach mostly a float page or a wade page?+
It is still float-first for most anglers. Wading exists around ramps and soft banks, but the best day usually comes from a controlled lower-river drift.
Can I keep cutthroat on this reach?+
No. Idaho Fish and Game lists Yellowstone cutthroat trout as no-harvest on the South Fork Snake, so careful identification and quick release matter.