Spate · Granite · Devon / South Hams, GB-ENG

River Yealm

River Yealm venue image
Good · Brown Trout
Gold-ribbed Hare's Ear · 10-14
Goodlive now
A proper day on the water
River dropping into shape after a lift. Fishing well — get there before it drops out.
75% confidence
What moved it
  • Level0.25 mDropping after lift
  • Water temp16.9°C
  • ClarityClearingClearing
Today's fly
Gold-ribbed Hare's Ear
Gold-ribbed Hare's Ear10-14
Upstream, sub-surface
Conditions on the water
Live gauge
Level
Steady
0.25 m
Dropping after lift
Water temp16.9°C
ClarityClearing
Weather15°C
WindW 14 km/h
Pressure1008 hPa
Rain · recent14.9 mm
Rain · ahead28.4 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
17°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
Good — river flow is working for you, but time of day is the limiting factor today.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 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
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2

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
Other water nearby · 5
River Erme
3.0 km
Brown trout · Sea trout
Avon Dam Reservoir
7.0 km
Brown trout
River Plym
9.0 km
0
Brown trout · Salmon · Sea trout
Burrator Reservoir
9.0 km
Rainbow trout · Brown trout
River Walkham
14 km
Brown trout · Sea trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 75%
How the 68 is built — score × weight = contribution
Temperature70 × 28%19.6
Flow80 × 22%17.6
Clarity75 × 18%13.5
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity57 × 12%6.8
Conditions total= 68
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
Apple MapsGoogle Maps
Seasons & zones
  • Trout 15 March → 30 September

Sea trout: Variable seasonal (2026)

Related guides
Yorkshire & SpidersNorth Country methodsTrout Near Londonaccess guideEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts