Spate · Limestone · Swaledale / North Yorkshire

River Swale

Photo of River Swale

Muscular spate river with power and temperament — strong current, broken water, boulder-strewn runs where spiders excel.

Marginal · Brown Trout
Pheasant Tail Nymph · 14-16
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.
90% confidence
What moved it
  • Level0.56 m
  • Water temp18.0°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-16
Upstream, sub-surface
Conditions on the water
Live gauge
Level
Steady
0.56 m
Water temp18.0°C
ClarityClear
Weather18°C
WindNW 16 km/h
Pressure1017 hPa
Rain · recent0.0 mm
Rain · ahead0.2 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
18°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Olives April into May; Mayfly late May where it holds; sedges through summer; small dark flies into October. Spate-driven — fish the drop after rain.
Where
Pool tails and riffle heads through the upper dale; below Richmond the Swale flattens into longer glides. Pocket water is key on the upper river.
Method
Upstream dry to risers when olives or sedges are off; North Country spider on the swing in cooler water — Snipe and Purple, Partridge and Orange, Waterhen Bloa. Move upstream slowly, fish each lie properly.
Kit
9 ft #4 — Yorkshire freestone default. Floating line, 9 to 12 ft leader to 4 to 5 lb fluoro. Studded boots for slick stones.
Why this works
Water at 18°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

Hatch predictions

Top prey shown — see all 2 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
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
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
North Country spider water

The muscular one — powerful, boulder-strewn, all necks and seams and eddies. The broken water gives the fish no time to think, which is exactly why spiders earn their keep here.

Local classics: Snipe & Purple·Partridge & Orange·Waterhen Bloa
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 18°C — probably warm enough to stress Brown Trout . These are likely cooler.
Mainsgill Farm Trout Fishery
20 km
~18°C
Rainbow trout · Brown trout
Gallery · 2
  1. Photo of River Swale
    River Swale — image via Wikipedia (River Swale)
  2. Terrain map of the venue
    Terrain map
About this water

Muscular spate river with power and temperament — strong current, broken water, boulder-strewn runs where spiders excel. Cover-water fishing at its best: every seam, neck, and eddy holds a fish. The turbulent water gives fish seconds to decide; a Snipe & Purple fished tight in the broken seams produces immediate takes. Strong wading skills essential — the Swale's current demands respect. Excellent grayling in winter. Club-based (Richmond & District) with day permits available. A river for practicing watercraft and reading current.

  • Limestone
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Fail
What this classification means

EA waterbody 'Swale from Muker Beck to Clapgate Beck' (GB104027069121) — the upper-Swaledale main stem (Reeth, Grinton, Marske, Downholme). Latest EA data (Cycle 3, 2022): Moderate ecological status. Chemical 'Fail' reflects the England-wide ubiquitous-substance failure (mercury and PBDE in biota); the 2022 cycle itself records chemical as 'does not require assessment'. Corrected 2026-06-18 from GB104027069000, which is Colburn/Risedale Beck (a Swale tributary), not the main stem.

EA (England) · GB104027069121

The full read · show the working · for Brown Trout · confidence 90%
How the 40 is built — score × weight = contribution
Temperature56 × 28%15.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity62 × 12%7.4
Conditions total= 74
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 22 March → 30 September
  • Grayling 16 June → 14 March

    The Swale is an outstanding grayling river. Most association and club water follows the full statutory window. Autumn through December is the classic period. Check Richmond & District Angling Club and local DA rules.

    Prime sport 1 September → 31 December

Related guides
Grayling Playbookgrayling tacticsYorkshire & SpidersNorth Country methodsTrout Near Londonaccess guide
Casting instructors near here
Booking & contacts