Chalk Stream · Chalk · Dorset, GB-ENG

River Allen (Dorset)

Photo of River Allen (Dorset)

The Allen is a tributary of the Stour running through the Crichel Estate in Dorset — a small chalk stream of exceptional water quality and habitat, with classic ranunculus, gravel runs, and stable flows.

Prime · Brown Trout
CDC F-Fly · 18-20
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
90% confidence
What moved it
  • Level0.44 mLast reading 3h ago
  • Water temp16.7°C
  • ClarityClear
Today's fly
CDC F-Fly
CDC F-Fly18-20
Upstream dry, on top
Conditions on the water
Live gauge
Level
Steady
0.44 m
Last reading 3h ago
Water temp16.7°C
ClarityClear
Weather18°C
WindN 19 km/h
Pressure1017 hPa
Rain · recent0.0 mm
Rain · ahead0.1 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
17°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 clarity is right today, though insect activity could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

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
1
Brown SedgeHatch
2
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Blue Winged OliveHatch
2
3
3
3
3
2
Mayfly (Green Drake)Hatch
2
2

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

Ranked for today
Brown Trout fly box

The heartland of English dry fly fishing. Upstream dry fly and emerger presentation dominates. Nymphing restricted or discouraged on many beats. Gin-clear alkaline water, prolific weed growth, educated wild brown trout. Precise imitation and delicate presentation are paramount.

Permits & access
Permit required — see local rules.
  • Private — Crichel Estate covers upper
  • Day tickets limited.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Damerham Trout Fisheries
14 km
Rainbow trout · Brown trout
Rockbourne Trout Fishery
17 km
Brown trout · Rainbow trout
River Piddle
19 km
Brown trout
Wessex Fly Fishing
23 km
Rainbow trout · Brown trout
River Wylye
27 km
78
Brown trout · Grayling
Gallery · 2
  1. Photo of River Allen (Dorset)
    River Allen (Dorset) — image via Wikipedia (River Allen, Dorset)
  2. Terrain map of the venue
    Terrain map
About this water

The Allen is a tributary of the Stour running through the Crichel Estate in Dorset — a small chalk stream of exceptional water quality and habitat, with classic ranunculus, gravel runs, and stable flows. Crichel House manages most of the upper-river beats; lower river around Wimborne Minster has limited day-ticket access. Wild brown trout, technical chalk-stream conditions on a smaller scale than the Hampshire chalks.

  • Chalk
The full read · show the working · for Brown Trout · confidence 90%
How the 80 is built — score × weight = contribution
Temperature83 × 28%23.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 April → 30 September
Related guides
Chalkstream Playbookchalk stream tacticsTrout Near Londonaccess guideEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts