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

River Erme

The River Erme flowing through a wooded valley above Ivybridge, Devon
Marginal · Brown Trout
Gold-ribbed Hare's Ear · 10-14
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level0.20 mLast reading 1h ago
  • Water temp18.1°C
  • ClarityClear
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
0.20 m
Last reading 1h ago
Water temp18.1°C
ClarityClear
Weather16°C
WindSW 30 km/h
Pressure1008 hPa
Rain · recent9.9 mm
Rain · ahead33.8 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
18°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 18.1°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 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

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

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
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
Cooler water nearby · 2
Water here around 18°C — probably warm enough to stress Brown Trout . These are likely cooler.
Venford Reservoir
13 km
~15°C
Brown trout
Burrator Reservoir
11 km
~17°C
Rainbow trout · Brown trout
Gallery · 2
  1. The River Erme flowing through a wooded valley above Ivybridge, Devon
    The River Erme above Ivybridge, Devon
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 80%
How the 39 is built — score × weight = contribution
Temperature40 × 28%11.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 69
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.
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
Clubs & associations