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

River Derwent (Yorkshire)

River Derwent (Yorkshire) terrain map
Tomorrow · About as good as it gets
Balloon Caddis
Forecast · Tomorrow
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% projected
Today's fly
Balloon Caddis
Balloon Caddis
Conditions on the water · Tomorrow
Proxy gauge
Level
Steady
Proxy
via River Rye
Water temp12.3°C
ClarityClear
Weather13°C
WindN 13 km/h
Pressure1016 hPa
Rain · recent4.0 mm
Rain · ahead1.9 mm

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

Water temperature for Brown Trout
Ideal
12°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
Excellent — water temperature is right today, though insect activity could be better.
Hatch timeline · tomorrowPeak at 11am

12pm(now) — Black Gnat

Stage: On emergersApproach: Emerger or dryActivity: 95%
Also:Heather Fly47%Pale Watery43%Cinnamon Sedge41%
Peak emergence windowWeather boost9 food groups active

Peak activity at 11am — Black Gnat (Black Gnat, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 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 · September 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
2
CapererHatch
2
3
3
2

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

Ranked for today
Brown Trout fly box
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
Brown trout · Grayling · Sea trout
River Nidd
39 km
Brown trout · Grayling
River Esk (North Yorkshire Moors)
48 km
Brown trout · Salmon · Sea trout
River Burn
53 km
Brown trout · Grayling
The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via River Ryeproxy
Prey activitysurvey-backed invertebrate datasurvey
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
Clubs & associations