Reference · works offline
Field guide
Plates for the decisions you make standing in the water: what you are looking at, where fish hold in it, what the surface is telling you, and the order to change things in.
These are habitat classes and reading aids. None of them is a location, a hotspot, or a claim that a fish is there today.
Field reference
Reading a reach
One stretch of river, labelled. Nothing here is a location — it is the vocabulary you use to describe any water you are standing in.
What this plate is telling you
Riffle
Shallow, broken, fast. Oxygen and insect production happen here.
Holds fish in warm weather and low light. Hard to read because the surface hides everything.
Head of the run
Where the riffle drops into deeper water and the current first organises.
The most reliable lie on most rivers. Food arrives concentrated and the fish spends little energy.
Seam
The visible line between a fast lane and a slow one.
Fish sit on the slow side and eat from the fast side. Fish the seam, not the fast water.
Pool / belly
Deep, slow, even. Often the least productive water of the reach in normal flow.
Holds fish in cold water, bright light, and low flow. Big fish, few of them, hard to move.
Tailout
Where the pool shallows and speeds up before the next drop.
Fish move here to feed in low light. Also the most likely spawning gravel — look before you wade.
Undercut / structure
Bank cut away under the surface, or wood and rock breaking the flow.
Cover. The largest fish in the reach is usually against something, not in the open.
Eddy
Water turning back upstream behind an obstruction or a bend.
Collects foam, and whatever the foam collects. The seam of an eddy is a feeding lane in its own right.
Field reference
Rise forms — what the surface is telling you
The shape of a rise says where in the column the fish is eating. That is a presentation decision. It does not identify the insect — Hatch Match is the tool for that.
Holding-water library
Twelve shapes of water
Trip Prep picks one of these from species, season, thermal state and water type. Here they all are, so you can compare what the desk chose against what you are actually looking at — and disagree with it on the bank.
Holding-water plate
Seams and riffle tails
The default on moving water outside runoff, heat and spawn.
What this plate is telling you
- Seam
- Riffle tail
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- The seam is the line between the fast lane and the slow one — fish sit on the slow side of it and eat out of the fast side.
- The riffle tail is where the broken water flattens. Food concentrates there and fish can see it.
- Stand below and to the side. Wading up the middle puts your legs through the water you came to fish.
Holding-water plate
Repeating riffle–run units
Stable tailwaters and spring creeks.
What this plate is telling you
- Front third of the run
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- This water builds the same unit over and over. Learn one riffle–run–pool properly and you have learned the river.
- Most fish sit in the front third of the run, where the riffle's food arrives and the current first slows.
- The mistake you make in the first unit you will repeat all day. Read it carefully before you move.
Holding-water plate
Runoff edges
High, coloured, pushy water — snowmelt or storm.
What this plate is telling you
- Soft edge
- Inside bend
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- In runoff the middle is neither fishable nor occupied. Everything that matters is within a rod length of the bank.
- Walk the bank, do not wade it. The most productive water in high flow is the water most anglers stand in.
- Colour is the constraint: fish cannot see far, so get close and give them something they can find.
Holding-water plate
Deep, slow winter water
Cold water, low metabolism, short feeding windows.
What this plate is telling you
- Walking pace
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- Find water that moves at the speed you could walk beside it, and fish it three times slower than feels right.
- If the fly is not occasionally ticking the bottom, you are fishing above them.
- A cold fish will not move sideways for food. Accuracy beats water covered.
Holding-water plate
Shade and broken water
Bright light, warm afternoons, low flow.
What this plate is telling you
- Shade
- Broken water
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- Broken surface is cover. So is shade. In bright warm hours fish use both rather than depth alone.
- Cast tight enough to the bank that a bad cast hits the grass. The fish are under the overhang, not two feet off it.
- Fish the coldest hour of the day and check the temperature in the afternoon, not at dawn.
Holding-water plate
Beside spawning gravel
Any spawning window. This plate is mostly about where not to go.
What this plate is telling you
- Staging water below
- Deeper water above
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- Clean, light-coloured gravel with fish sitting on it is a redd. Do not cast at it and do not walk through it — eggs are crushed by boots long after the fish have gone.
- The staging water above and below the gravel is fair game and usually holds the larger fish anyway.
- If you cannot tell the difference, treat the whole shallow gravel flat as off limits and fish the deeper water.
Holding-water plate
Current breaks over hard bottom
River smallmouth, walleye, warmwater rivers.
What this plate is telling you
- Break behind rock
- Slow lane
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- One rock with a slack pocket behind it holds more fish than the next hundred yards of even bank.
- Hard bottom matters as much as the break — crayfish need rock, and so does the fish eating them.
- Fish the seam beside the break as well as the pocket behind it. Both are holding water.
Holding-water plate
Cover, shade, depth
Warmwater stillwater and slow rivers.
What this plate is telling you
- Outside edge first
- Then into it
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- Warmwater fish relate to something before they relate to current. Fish the object, not the water between objects.
- Work the outside edge before you cast into the middle. The fish nearest open water is the one you can catch without spooking the rest.
- Cover first, then shade, then depth — in that order, all season.
Holding-water plate
Weed edges
Pike and other ambush predators.
What this plate is telling you
- The edge itself
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- An ambush predator lies just inside cover where it can see out without being seen. That is the edge, not the middle.
- Work parallel to the edge rather than casting into the weed — you cover far more of the productive line per cast.
- It takes upward. Fish above it and let it come to the presentation.
Holding-water plate
Travel lanes
Steelhead and salmon — fish moving through, not living here.
What this plate is telling you
- Walking-pace lane
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- A migrating fish is passing through, not living here. You are covering water to intercept, not matching a food item.
- Fish one run properly with a step after every cast rather than visiting five runs badly.
- Swing speed matters more than fly choice. If the fly is not under tension, it is not fishing.
Holding-water plate
Sight-fishing a flat
Carp, and any fish you can see before you cast at it.
What this plate is telling you
- Feeding lane, one fish
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
- This is hunting. Spend the first twenty minutes looking rather than casting.
- A tailing or slowly rooting fish is feeding and will eat. A fish moving in a straight line is going somewhere and will not.
- Lead the fish and let the presentation settle. A fly dropped on its back ends the session for that fish and its neighbours.
Holding-water plate
The cold, oxygenated layer
Lake trout, kokanee, and stillwater through summer.
What this plate is telling you
- Cold and oxygenated
Depth band · where the presentation should sit
- Film
- Upper
- Mid
- Near bottom
- Bottom
Find the layer first — depth is the variable here
- Depth is the variable, not the pattern. Establish the layer before you decide anything else.
- The layer moves down through summer and back up in autumn — last month's depth is not this month's.
- A vertical presentation is the only way to hold a fly or lure inside a specific band.
Decision flow
The one-change loop
The point is not to make more changes. It is to make each change interpretable. A hard stop exits the loop; everything else returns to observation with one more piece of evidence.
What this plate is telling you
- 01
Observe
Name what actually happened.
- 02
Gate
Safety, regulation, thermal stop?
- 03
Choose one axis
Water · depth · speed · angle · size · family.
- 04
Define the test
Say what stays constant and what would count.
- 05
Fish the test
Give the change an honest sample.
- 06
Record
Contact, refusal, follow, no signal — then repeat.
Fast decision matrix
Signal → first test
This is the compressed bank-side version of Field Mode's change discipline. It is not a prediction table. Start with what you actually observed, change one axis, hold the rest still, and decide in advance what result would count as evidence.
| Observed signal | First move | Hold constant | How to read it |
|---|---|---|---|
| 45 minutes in one holding class, no contact | Change water | Keep the rig and retrieve constant | Give genuinely different water 20 honest minutes. |
| Two or more refusals | Size, then angle | Keep the presentation family constant | Smaller/finer first; then same fly from a cleaner drift angle. A refusal is evidence, not a blank. |
| Two or more follows, no contact | Change speed or direction | Keep pattern and depth constant | Three deliberate retrieves. A follower already found the presentation. |
| Subsurface rig never touches bottom | Add depth | Keep pattern and water constant | Add weight or length until bottom contact becomes occasional, not constant. |
| Constant bottom contact | Come up | Keep the rest of the system constant | Remove weight or shorten the drop until the rig ticks rather than drags. |
| Cloud comes in or direct sun leaves | Test higher/open water | Keep the presentation family constant | Give the newly usable water 15 minutes before changing again. |
| Direct sun arrives | Change water | Do not solve light with a fly change | Prioritize shade, depth and broken surface for the next pass. |
| Water is rising or colouring | Move to soft edges | Keep safety ahead of presentation | If the rise continues or crossing changes, stop treating it as a fishing problem. |
| Measured temperature reaches the species handling threshold | Stop | Nothing to test | Move to colder water, return at a cooler time, or end the session. This is not a presentation variable. |
A hard stop outranks the matrix. Regulation, unsafe access, lightning, rising water, or a species handling threshold is not an invitation to optimize the rig.
Change discipline
The order to change things in
Change one variable at a time, or a fish tells you nothing about which change worked. When you do change, work down this list — most anglers start at the bottom.
- 01
Change water
The variable most anglers change least and should change most. Changing pattern in unproductive water is the commonest way to waste a day.
- 02
Change depth
Most presentations fail because they are in the wrong part of the column, not because they are the wrong shape. Depth is cheap to test and gives a clear answer.
- 03
Change speed
Dead drift, swing, twitch, strip. Movement changes what a presentation is far more than a pattern change does.
- 04
Change angle
Where you stand controls drag, and micro-drag you cannot see causes most refusals on a drifted presentation.
- 05
Change size
Smaller and finer, in that order, and only after refusals — a refusal means the fish looked, which means size or drift, not category.
- 06
Change family
A family change is a real commitment. Make it deliberately, fish it properly, and do not go back and forth.
On the water
Field mode applies this list to what you have actually logged, and makes you write down why you changed. That sentence is what the next trip reads.
Open field modeWatch and learn
Visual lessons for the jobs that are easier to see
These are external procedural references, not endorsements and not substitutes for local regulations. They are here only where motion matters: reading current, wading, handling, casting, surface presentation and tying a connection.
Orvis Guide to Fly Fishing
Reading the Water to Successfully Locate Trout
Use beside the reach and holding-water plates. It shows how current, depth and cover divide a river into different jobs.
The Orvis Company
Tips for safe wading
Use before a moving-water trip. The value is procedural: stance, movement, traction and avoiding a bad crossing decision.
Orvis Guide to Fly Fishing
How to Catch and Release Fish
Use for handling discipline. It complements the desk's thermal stop rather than weakening it into a generic caution.
The Orvis Company
The Basic Fly Cast
Use when presentation is being limited by loop control rather than fly choice. This is a mechanics lesson, not a gear recommendation.
Orvis Guide to Fly Fishing
Dry Fly Fishing Basics
Use beside rise forms when the surface is actually providing evidence. It is scoped to dry-fly presentation, not general fish location.
Orvis Guide to Fly Fishing
Orvis Tippet Knot | How To
A quick visual knot refresher when the system calls for a smaller/finer change. For a full knot decision, use Knot Analyst.
Videos require a connection. The guide, plates and decision matrix above do not.