Mixed · Surrey

River Mole (Surrey)

The Surrey Mole runs from Crawley through Horley, Dorking, Leatherhead and Esher to join the Thames at Hampton.

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Warm — handle with careBrown Trout are stressed by warm water — handle every fish carefully.

Water measured at 20.9°C from the nearest gauge. Above 18°C, the risk of killing a released fish climbs. Fish dawn or dusk only — the water can be two or three degrees cooler at first light. Barbless hooks. Land it fast — under thirty seconds. Wet hands. No air shots. If a fish swims off slowly or rolls, stop fishing for the day.

DepthShaded riffles, deep pools, spring inflows, cold tributary mouths. Work them and move on.
TimingDawn and dusk only. Avoid the middle of the day — the water peaks then and the fish are most stressed.

Poorlive now

Not the day for it

River high but settled. Take your time — read the water before you cast.

80% confidence

Notify when prime

What moved it

Level1.43 mDropping in the last 6h
Water temp20.9°C
ClarityClear

Today’s fly

Sherry Spinner14-16

Upstream dry, on top

Live now

Conditions on the water

Live gauge

Trends shown where the gauge supports them

Level

Steady

1.43 m

Dropping in the last 6h

Water temp

20.9°C

coldwarm

Clarity

Clear

Weather

17°C

Light cloud

Wind

SW 13 km/h

calmblown out

Pressure

1022 hPa

lowhigh

Rain · recent

1.2 mm

dryspate risk

Rain · ahead

0.4 mm

dryspate risk

Live readings only. Trends shown where the gauge supports them.

Water temperature for brown trout

Warm — slow

20.9°Cideal 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

⚠️ Water at 20.9°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.

Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 4 active hatches hour by hour 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 · July highlighted

Trout season

Daddy Long Legs

Grannom

Evening Sedge

Large Dark Olive

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.

Private / coarse club.

What's coming

Plan ahead

5-day outlook

Water here at 20.9°C. Nothing cooler within range.

Gallery · 1

Terrain map

About this water

The Surrey Mole runs from Crawley through Horley, Dorking, Leatherhead and Esher to join the Thames at Hampton. Distinct from the Devon Mole. Mixed-use river — light trout interest on cleaner reaches around Dorking and Mickleham, otherwise coarse-fishing identity. Mostly private and club water.

Mixed

The full read · show the working · for brown trout · confidence 80%

How the 22 is built — score × weight = contribution

Temperature15 × 28%4.2

Flow80 × 22%17.6

Clarity95 × 18%17.1

Feeding Time60 × 13%7.8

Pressure80 × 7%5.6

Insect activity53 × 12%6.4

Limiting factor: Water temperature (20.9°C) is outside Brown Trout's preferred range (10–16°C)= 59

Can you trust it?

Water temperaturelive gauge readinggauge

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.

The dawn and dusk windows score higher than the midday lull.

Directions

Apple Maps Google Maps

Seasons & zones

Trout1 April → 30 September

Related guides

Booking & contacts