Stoneflies
Gammarids
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
Rules at a glance
- Fly only
Water temperature for Brown Trout
Cool — slow10°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.
Likely species
Hatch timeline · tomorrowPeak at 12pm
12pm(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 51%
Also:Autumn Needle Fly32%Black Midge28%
Peak emergence window5 food groups active
Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
Mayfly (Green Drake)Hatch
2
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
CapererHatch
2
3
3
2
Brown SedgeHatch
2
3
3
3
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
Gallery · 2
River Allen (Dorset) — image via Wikipedia (River Allen, Dorset) Terrain map
About this water
Water quality (WFD)
- Ecology: Good
Water quality details
- Dissolved oxygen: High
- Ammonia (Phys-Chem): High
- pH: High
- Phosphate: High
- Temperature: High
EA (England) · GB108043011090
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature93 × 28%26.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 April → 30 September
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
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.
Water temperature for Brown Trout
Cool — slow10°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.
Likely species
Hatch timeline · tomorrowPeak at 12pm
12pm(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 51%
Also:Autumn Needle Fly32%Black Midge28%
Peak emergence window5 food groups active
Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
Mayfly (Green Drake)Hatch
2
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
CapererHatch
2
3
3
2
Brown SedgeHatch
2
3
3
3
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
Gallery · 2
River Allen (Dorset) — image via Wikipedia (River Allen, Dorset) Terrain map
About this water
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
Water quality (WFD)
- Ecology: Good
Water quality details
- Dissolved oxygen: High
- Ammonia (Phys-Chem): High
- pH: High
- Phosphate: High
- Temperature: High
EA (England) · GB108043011090
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature93 × 28%26.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 April → 30 September
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
At a glance
River Allen (Dorset) is a chalk stream in Dorset, England. Its recorded elevation is about 59 m above sea level and the catchment geology is chalk. The river is described as roughly 14 km long. The species listed for this water is brown trout. The trout season is recorded as running from 1 April to 30 September. Best window recorded for anglers: April–June; September on cool days. Core methods listed: dry fly; upstream nymph. Level and flow data for this water is linked from the gauge “Loverley Farm Moor Crichel (43218, upper) + Walford Mill Wimborne (43216, lower) — confluence with Stour near Wimborne Minster”. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Longham Lakes at 11 km, Damerham Trout Fisheries at 14 km and Rockbourne Trout Fishery at 17 km.