Chalk Stream · Chalk · Wiltshire, GB-ENG

River Bourne (Wiltshire)

The River Bourne chalk stream flowing through Idmiston near Salisbury, Wiltshire

The Wiltshire Bourne (Hampshire Avon tributary, distinct from the Hampshire Bourne) runs through Salisbury Plain country from Tidworth past Salisbury to join the Avon.

Marginal · Brown Trout
CDC F-Fly · 18-20
Slow going — pick your moments
River steady at a fishable height. Slow going — pick your moments and do not force it.
45% confidence
limited data
What moved it
  • Level0.73 mLast reading 9h ago
  • Water temp17.6°C
  • ClarityVery colouredColouring up
Today's fly
CDC F-Fly
CDC F-Fly18-20
Upstream dry, on top
Conditions on the water
Live gauge
Level
Rising
0.73 m
Last reading 9h ago
Water temp17.6°C
ClarityVery coloured
Weather20°C
WindN 17 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead0.0 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
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
Poor — barometric pressure is working for you, but water clarity is the limiting factor today.
Hatch timeline · todayPeak at 5pm

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour 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 · regionalModerate 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 syndicate
  • Salisbury Estate offers limited access.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Avon Springs
8.0 km
Brown trout · Rainbow trout
River Wylye
11 km
Brown trout · Grayling
Amport Trout Fishery
12 km
Rainbow trout
Holbury Lakes Trout Fishery
17 km
Rainbow trout · Brown trout
John O Gaunt's Fishery
17 km
Rainbow trout · Brown trout
Gallery · 2
  1. The River Bourne chalk stream flowing through Idmiston near Salisbury, Wiltshire
    River Bourne at Idmiston, Wiltshire
  2. Terrain map of the venue
    Terrain map
About this water

The Wiltshire Bourne (Hampshire Avon tributary, distinct from the Hampshire Bourne) runs through Salisbury Plain country from Tidworth past Salisbury to join the Avon. Classic Wessex chalk stream — stable flows, technical clear water, wild brown trout. Mostly private syndicate water but the Salisbury area sometimes offers limited day tickets via Salisbury Estate or local clubs.

  • Chalk
The full read · show the working · for Brown Trout · confidence 45%
How the 30 is built — score × weight = contribution
Temperature64 × 28%17.9
Flow55 × 22%12.1
Clarity15 × 18%2.7
Feeding Time75 × 13%9.8
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Limiting factor: Water is very coloured — too coloured for Brown Trout= 55
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.
A drop and clear would lift the flow and clarity scores.
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