Stoneflies
Caddisflies
Gammarids
Classic Dorset chalk stream flowing through the Piddle Valley to Poole Harbour. Crystal-clear spring-fed water with wild brown trout, prolific hatches, and the intimate scale that makes chalk stream fishing so absorbing.
- Chalk
Water temperature for Brown Trout
Ideal16°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Excellent — water temperature is right today, though time of day could be better.
Likely species
Caddisflies
- Net-spinning caddisMost likelyLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · todayPeak at 4pm
12pm(now) — Daddy Long Legs
Stage: On emergersApproach: Emerger or dryActivity: 42%
Also:Pale Watery25%Cinnamon Sedge25%
Weather boost8 food groups active
Peak activity at 4pm — Small Spurwing (Small Spurwing, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 4 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Mayfly (Green Drake)Hatch
2
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
CapererHatch
2
3
3
2
Brown SedgeHatch
2
3
3
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
A chalk stream shrunk to its essentials — clear, weedy, and quick to spook. Fish rise freely to a small dry in the hatch windows; between them, the induced take earns its keep.
Local classics: Pheasant Tail Nymph·CDC Olive·Iron Blue Dun
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
The River Piddle near Trigon Farm, a chalk stream weir close to Wareham, Dorset. Terrain map
About this water
Water quality (WFD)
- Ecology: Moderate
Water quality details
- Dissolved oxygen: High
- Ammonia (Phys-Chem): High
- pH: High
- Phosphate: High
- Temperature: High
EA (England) · GB108044010080
The full read · show the working · for Brown Trout · confidence 75%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity68 × 12%8.2
Conditions total= 82
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 April → 15 October
- Grayling 16 June → 14 March
Statutory window is 16 June – 14 March. Mostly private syndicate water — treat October to February as a provisional working default and confirm with the beat.
Typically fished 1 October → 28 February.
Prime sport 1 October → 28 February
Related guides
Casting instructors near here
Booking & contacts
Clubs & associations
- Wessex Fly FishingDay tickets
Boards & regulators
River Piddle
Classic Dorset chalk stream flowing through the Piddle Valley to Poole Harbour.
Water temperature for Brown Trout
Ideal16°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Excellent — water temperature is right today, though time of day could be better.
Likely species
Caddisflies
- Net-spinning caddisMost likelyLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · todayPeak at 4pm
12pm(now) — Daddy Long Legs
Stage: On emergersApproach: Emerger or dryActivity: 42%
Also:Pale Watery25%Cinnamon Sedge25%
Weather boost8 food groups active
Peak activity at 4pm — Small Spurwing (Small Spurwing, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 4 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Mayfly (Green Drake)Hatch
2
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
CapererHatch
2
3
3
2
Brown SedgeHatch
2
3
3
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
A chalk stream shrunk to its essentials — clear, weedy, and quick to spook. Fish rise freely to a small dry in the hatch windows; between them, the induced take earns its keep.
Local classics: Pheasant Tail Nymph·CDC Olive·Iron Blue Dun
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
The River Piddle near Trigon Farm, a chalk stream weir close to Wareham, Dorset. Terrain map
About this water
Classic Dorset chalk stream flowing through the Piddle Valley to Poole Harbour. Crystal-clear spring-fed water with wild brown trout, prolific hatches, and the intimate scale that makes chalk stream fishing so absorbing.
- Chalk
Water quality (WFD)
- Ecology: Moderate
Water quality details
- Dissolved oxygen: High
- Ammonia (Phys-Chem): High
- pH: High
- Phosphate: High
- Temperature: High
EA (England) · GB108044010080
The full read · show the working · for Brown Trout · confidence 75%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity68 × 12%8.2
Conditions total= 82
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 April → 15 October
- Grayling 16 June → 14 March
Statutory window is 16 June – 14 March. Mostly private syndicate water — treat October to February as a provisional working default and confirm with the beat.
Typically fished 1 October → 28 February.
Prime sport 1 October → 28 February
Related guides
Casting instructors near here
Booking & contacts
Clubs & associations
- Wessex Fly FishingDay tickets
Boards & regulators