Spate · Mixed · Cumbria

River Cocker

A tree-canopied stretch of the River Cocker in Cumbria, calm clear water flanked by dense green foliage.

The Cocker is a Lake District trout river — a Derwent tributary running from the Buttermere/Crummock Water valley through the Lorton Vale to join the Derwent at Cockermouth.

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
  • Level0.33 mDropping after lift
  • Water temp21.9°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
0.33 m
Dropping after lift
Water temp21.9°C
ClarityVery coloured
Weather21°C
WindW 18 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead0.9 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
22°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 21.9°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

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

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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
Trout seasonSeason
1
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2

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

Ranked for today
Brown Trout fly box

Spider-heavy and practical. Strong tradition of North Country soft hackles, useful nymphing, and simple dry flies when fish rise properly.

Permits & access
Permit required — see local rules.
  • Penrith AA / private.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 22°C — probably warm enough to stress Brown Trout . These are likely cooler.
Ennerdale Water
15 km
~20°C
Brown trout
Gallery · 2
  1. A tree-canopied stretch of the River Cocker in Cumbria, calm clear water flanked by dense green foliage.
    River Cocker
  2. Terrain map of the venue
    Terrain map
About this water

The Cocker is a Lake District trout river — a Derwent tributary running from the Buttermere/Crummock Water valley through the Lorton Vale to join the Derwent at Cockermouth. Lake-fed flows from Crummock give it some stability; lower freestone character. Wild brown trout, no salmon. Penrith Angling Association covers some water.

  • Mixed
The full read · show the working · for Brown Trout · confidence 80%
How the 14 is built — score × weight = contribution
Temperature7 × 28%2.0
Flow80 × 22%17.6
Clarity15 × 18%2.7
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Limiting factor: Water temperature (21.9°C) is outside Brown Trout's preferred range (10–16°C)= 40
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 22 March → 30 September
Related guides
Yorkshire & SpidersNorth Country methodsTrout Near Londonaccess guideEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts