River · Mixed · West Country / Devon, GB-ENG

The Arundell Arms Hotel & Fishery

A small, clear West Country river flanked by trees and daffodils, with a stone farmhouse visible beyond the bank.
Poor · Brown Trout
Pheasant Tail Nymph · 14-16
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
80% confidence
What moved it
  • Level0.15 mDropping after lift
  • Water temp20.8°C
  • ClarityVery colouredColouring up
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-16
Upstream, sub-surface
Conditions on the water
Live gauge
Level
Steady
0.15 m
Dropping after lift
Water temp20.8°C
ClarityVery coloured
Weather21°C
WindN 22 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead3.2 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Warm — slow
21°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
Water at 20.8°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
What's coming
Plan ahead
5-day outlook
Water here around 21°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. A small, clear West Country river flanked by trees and daffodils, with a stone farmhouse visible beyond the bank.
    River Lyd at Sydenham
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 80%
How the 22 is built — score × weight = contribution
Temperature16 × 28%4.5
Flow80 × 22%17.6
Clarity15 × 18%2.7
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity50 × 12%6.0
Limiting factor: Water is very coloured — too coloured for Brown Trout= 47
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon 1 February → 31 October
  • Trout 1 April → 30 September

Sea trout: Variable seasonal (2026)

Salmon: Negligible (2026) — EA 2024 Salmon Stocks Assessment classifies this river 'at risk' — egg deposition below Conservation Limit. Conservation priority; not a salmon fishing destination. The Tamar system (Arundell Arms beats) is at risk; salmon are now scarce on these waters.

Related guides
Trout Near Londonaccess guideEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts
Clubs & associations