Lowland · Mixed · Yorkshire / Vale of Pickering, GB-ENG

River Derwent (Yorkshire)

River Derwent (Yorkshire) terrain map
Today · A proper day on the water
Pheasant Tail Nymph
Forecast · Today
A proper day on the water
A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
65% projected
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph
Conditions on the water · Today
Proxy gauge
Level
Rising
Proxy
via River Rye
Water temp9.4°C
ClarityVery coloured
Weather8°C
WindN 28 km/h
Pressure999 hPa
Rain · recent7.5 mm
Rain · ahead1.2 mm

No gauge on this water — conditions are inferred from River Rye. The trend transfers, the absolute level does not.

Water temperature for Grayling
Ideal
9°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today. Grayling feeds actively in cold water — peak winter sport.
Likely species
Mayflies
Stoneflies
Caddisflies
Chironomids
Gammarids
Hatch timeline · todayPeak at 13 Uhr

12 Uhr(now) — Iron Blue

Stage: On emergersApproach: Emerger or dryActivity: 34%
Weather boost3 food groups active

Peak activity at 13 Uhr — Iron Blue (Iron Blue, Weather boost)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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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 · October 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
Mayfly (Green Drake)Hatch
2
2
Large Cinnamon SedgeHatch
2
3
3
2
Daddy Long LegsHatch
2
3
3
2
CapererHatch
2
3
3
2

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

Ranked for today
Fly box · Grayling
Permits & access
Permit required — see local rules.
  • Club-controlled game water; day-ticket and membership access varies by beat
  • Grayling club season closes 31 December (earlier than the statutory 14 March)
  • Check the controlling club before travelling.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Costa Beck
15 km
Brown trout
River Rye
22 km
76
Brown trout · Grayling · Sea trout
River Nidd
39 km
62
Brown trout · Grayling
River Esk (North Yorkshire Moors)
48 km
Brown trout · Salmon · Sea trout
River Burn
53 km
63
Brown trout · Grayling
The full read · show the working · for Grayling · confidence 55%
How the 77 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity72 × 12%8.6
Conditions total= 77
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via River Ryeproxy
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 25 March → 30 September
  • Grayling 16 June → 14 March

    Statutory grayling season is 16 June – 14 March, but the controlling clubs close grayling fishing on 31 December — earlier than the statutory date. Plan a winter grayling visit before the turn of the year, and confirm current club rules before travelling.

    Club water closes 31 December — earlier than the legal 14 March.

    Prime sport 1 October → 31 December

Related guides
Grayling Playbookgrayling tacticsTrout Near Londonaccess guideEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts