Spate · Granite · Devon, GB-ENG

River Tavy

Photo of River Tavy

A western Dartmoor spate river running fast over granite into the Tamar.

Poor · Sea Trout
Black & Silver Tube · 1-2 inch
Poorlive now
Slow going — better windows ahead
River temperature is the limiting factor today, not the flow. The thermal advice above stands. Rest this water for the species today.
80% confidence
What moved it
  • Level0.09 mDropping after lift
  • Water temp18.5°C
  • ClarityUnfishableColouring up
Today's fly
BS
Black & Silver Tube1-2 inch
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
Conditions on the water
Live gauge
Level
Steady
0.09 m
Dropping after lift
Water temp18.5°C
ClarityUnfishable
Weather17°C
WindN 20 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead1.3 mm

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

Water temperature for Sea Trout
Warm — slow
19°C est.ideal 815°C
0°14°28°
How to fish it · for Sea Trout
When
From dusk into the first half of the night.
Where
Deeper pools and slower glides · hold water and current seams.
Method
Fish dark patterns on a sink-tip or lightly sunk line, especially near structure.
Kit
10 ft #6/7 rod, floating line with a sink-tip option, 8–10 lb fluoro tippet for the swing.
Why this works
Water at 18.5°C — above the sea 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

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Sub-surface · on the nymphunder the surface

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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
Salmon runRun
1
2
2
2
2
2
1
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
Sea Trout fly box

Fast, moody Dartmoor water that turns over in hours, not days — you get a narrow window on the falling spate, so be ready. Small flies and spiders, fished short into the pocket water.

Local classics: Half Stone·Blue Upright
BS
Black & Silver TubeTop
1-2 inch · Tube
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
SF
Snake Fly (Black)
2-4 inch · Streamer
A mobile eel-like profile that undulates through deep pools — effective when sea trout are lying deep and not responding to conventional wets.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Photo of River Tavy
    River Tavy — image via Wikipedia (River Tavy)
  2. Terrain map of the venue
    Terrain map
About this water

A western Dartmoor spate river running fast over granite into the Tamar. Salmon and sea trout with wild brown trout in the moorland sections. Short, steep and responsive to rain — classic Devon spate water. Atlantic salmon are assessed by the Environment Agency against each river's Conservation Limit — many principal rivers are classed 'at risk' with mandatory catch-and-release byelaws; check current rules before fishing.

Under the surface

The Tavy rises in the high blanket bog of northern Dartmoor, at Tavy Head just south of Fur Tor and Cut Hill, within half a mile of the sources of the Taw and the Okement. From there it cuts a rough, steep-sided valley south-west, squeezing through the boulder chaos of Tavy Cleave before it emerges among the farmland and runs down past Tavistock to join the Tamar near the tide. It is no gentle lowland river: swift and clean, it crashes over and around a granite bed, rising and falling hard with the moorland weather. The water is acidic and quick-clearing off the granite, peat-stained in spate. The Tavy carries a good run of salmon and the sea trout — peal — for which the Devon rivers are known. Wading is serious granite-boulder work, slick and uneven, and the Cleave in particular is no place to be caught by a rising river.

Wading: Slick granite boulders, fast to rise in Tavy Cleave

Sea trout here

Summer-autumn runs (June–September), nocturnal peak season pattern

  • Granite
  • Partly confined
  • Step pool
  • Pool riffle
Why this score · for Sea Trout
  • Temperature928% weight
  • Flow8022% weight
  • Clarity1018% weight
  • Feeding Time4013% weight
  • Pressure857% weight
  • Insect activity2812% weight
Directions
Seasons & zones
  • Salmon 1 March30 September
  • Trout 15 March30 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 Tavy is one of several West Country rivers in steep decline.

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