The Decisioning Ledger
Why this fly, here, now.
The Woolly Gentleman's recommendation model treats fly selection as a field problem: species biology, water temperature, food availability, presentation, visibility, and proof.
Observe
Water + Weather
Pull temperature, flow, clarity, weather, tide, and time window before pattern names enter the conversation.
Constrain
Species + Region
Confirm the species belongs in the region and that the fly imitates a real food source for that fish.
Predict
Hatch + Forage
Use season and temperature to identify likely insects, baitfish, crustaceans, terrestrials, eggs, or leeches.
Present
Style + Water Column
Choose dead drift, swing, strip, pop, skate, or crawl based on behavior, flow, depth, and visibility.
Rank
Score + Caveat
Score candidates with weighted evidence and show confidence rather than pretending local water is perfectly knowable.
Verify
Image + Product
Require the source product and image to actually match the named pattern before it earns trust.
Weighted Model
Candidate Fly Score
Species + Food Fit
17%
Is this fly imitating something the target species actually eats here?
Water Temperature
15%
Does current water temperature activate this food form or stress the fish?
Regional Locality
14%
Does this pattern belong to this watershed, coast, or regional food web?
Season + Hatch
12%
What is hatching, migrating, spawning, or falling into the water right now?
Water Ledger Fit
7%
Does the specific water record support this season and fly family?
Presentation Style
11%
Should this be dead-drifted, swung, stripped, skated, popped, or crawled?
Clarity + Contrast
9%
Can fish find the fly without making it look unnatural?
Flow + Depth
7%
Will this fly reach the fish and behave correctly in the current?
Time, Weather, Tide
5%
Is the feeding window open right now?
Confidence + Caveats
2%
How much of the answer is observed data versus inherited field wisdom?
Visual + Catalog Integrity
1%
Does the product image and sourced fly actually match the named pattern?
Hatch Micro-Math
Matching the hatch is not matching a name.
When the water says "insect," exact pattern is only the last five percent. The model prioritizes what a feeding fish can actually read in the drift.
size
35%Most refusals start with the wrong hook size or body scale.
silhouette/shape
25%Mayfly, caddis, stonefly, baitfish, crab, and terrestrial profiles are read quickly.
behavior/presentation
20%Dead drift, swing, strip, skate, crawl, or pop must match the natural.
color/contrast
15%Exact shade matters less than visibility, contrast, and natural tone.
exact pattern
5%Pattern name is the final refinement, not the first decision.
Source Ledger
Data that can make the model sharper.
Official APIs govern live conditions; field and pattern references govern fly behavior and visual truth.
USGS Instantaneous Values Service
U.S. Geological Survey
Live freshwater conditions, temperature conversion, and relative flow context.
USGS 3DHP all FeatureServer
U.S. Geological Survey
Official hydrography identity layer for each atlas water before species, hatch, or fly-style claims are strengthened.
ArcGIS REST Services Directory
ArcGIS Enterprise
Implementation reference for turning official ArcGIS FeatureServer layers into repeatable water-evidence adapters.
USGS Network Linked Data Index
U.S. Geological Survey
Match each fishing water to connected gauges and flowlines instead of relying only on nearest straight-line station distance.
U.S. Inland Creel and Angler Survey Catalog
U.S. Geological Survey
Backlog source for validating waterbody-specific target species, angler catch, and pressure assumptions.
State recreational fishing websites
NOAA Fisheries
Routes saltwater state adapters to current agency pages before strengthening species or season claims.
State fish and wildlife agency directory
Association of Fish & Wildlife Agencies
Keeps the 50-state atlas source plan pointed at agency-owned corroboration rather than search-result folklore.
Blue Ribbon Fisheries VIEW
Utah Division of Wildlife Resources
Seeds the Utah waters atlas with official waterbody coordinates beyond the Green River.
2026 Fish stocking information
Utah Division of Wildlife Resources
Corroborates species chips for stocked Utah waters while leaving wild species claims marked for guide validation.
NOAA CO-OPS Data Retrieval API
NOAA Tides & Currents
Saltwater timing, moving-water windows, flats visibility, and inshore condition context.
National Weather Service API
NOAA National Weather Service
Cloud cover, wind, storm fronts, temperature swings, and safety/comfort context.
StreamCat Dataset
U.S. Environmental Protection Agency
Future watershed enrichment: gradient, land cover, climate, and habitat modifiers.
Experimental warming drives aquatic insect emergence timing
U.S. Forest Service Research
Treat temperature as a first-class hatch model input, not just comfort data.
Comprehensive Introduction to Fly Fishing
Fly Fishers International
Support the weighted priority model for hatch matching and presentation logic.
Can't stand the heat? Neither can trout
Arizona Game and Fish Department
Warm-water warning and trout recommendation suppression above stress thresholds.
Lake trout
Michigan Department of Natural Resources
Great Lakes Lake Trout profile, seasonal caveats, and baitfish/smelt fly justification.
Spatio-temporal and size-related variation in the diet of Lake Trout in Lake Michigan
U.S. Geological Survey
Supports baitfish streamer selection for open-water Great Lakes lake trout rather than hatch-matching dry-fly logic.
The Best Lake Trout Lures of 2024
Field & Stream
Great Lakes Lake Trout Clouser image prompt, sink-rate logic, and presentation notes.
Chocklett's Game Changer
Fly Fisherman
Pattern-specific image regeneration and product authenticity checks.
Galloup's Sex Dungeon
Trident Fly Fishing
Pattern-specific image regeneration and visual QC.
Intruder
Umpqua
Pacific Northwest steelhead image and style validation.
Amy's Ant
Umpqua
Regenerate Amy's Ant as a foam terrestrial with wing and legs.
Umpqua Cuda Fly
Trident Fly Fishing
Regenerate Cuda Fly with extreme length-to-width ratio.
WD-40
RiverKeeper Flies
Regenerate WD-40 without a dry-fly wing or oversized profile.
Hexagenia
Jackson Hole Fly Company
Regenerate Great Lakes Hex as a large pale mayfly rather than generic parachute dry.
Striped Bass Fly Tackle
Northeast Angling
Snake Fly and Northeast baitfish profile validation.
Visual Truth
The flies must look like the flies.
The Flybox photography is intentionally quiet and consistent. The audit queue tracks the patterns where iconic construction matters enough that a generic family resemblance is not good enough.
Cuda Fly (Needlefish)
verifyLong, pencil-thin needlefish profile with sparse synthetic fibers, flash, small eyes, and bite-wire impression.
fk-cuda-fly
Snake Fly
verifyLong all-white ostrich/marabou/bucktail profile with breathing body, shaped deer-hair head, and sparse flash.
ne-snake-fly
Game Changer
verifyLinked multi-section baitfish streamer with clear articulated body rhythm and tapered swimming profile.
gl-game-changer
Sex Dungeon
verifyArticulated double-section streamer with marabou, webby hackle, rubber legs, dumbbell eyes, and spun deer-hair head.
rm-sex-dungeon
The Intruder
verifyLarge two-stage steelhead fly with trailing hook feel, shoulder stations, ostrich/emu-like fibers, and bold swing profile.
pnw-intruder
Amy's Ant
verifyFoam terrestrial attractor with segmented foam body, rubber legs, wing, and visible indicator/under-wing structure.
rm-amys-ant
Hex (Hexagenia)
verifyLarge pale yellow/cream mayfly dry with extended body, tails, and broad upright or spent wings.
gl-hex-pattern
WD-40
verifySlim tiny nymph/emerger with thread body, small thorax, wood duck or flank fibers, sparse tail, no big dry-fly wing.
rm-wd-40