Spate · Granite · Brittany / Finistère (Quimper)

Jet

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Terrain map

Small Quimper-area trout river with deep holes holding good trout.

Species

Not the day for it

Low and clear — careful approach country. A morning for the obvious fish only.

Sitting at a steady height, running clear, the water's warmed to around 21°C.

80% confidence in this read
Water temperature for brown trout
Warm — slow
21°C est.ideal 10–16°C
0°14°28°
The full read · show the working · for brown trout · confidence 80%
How the 21 is built — score × weight = contribution
Temperature14 × 28%3.9
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity44 × 12%5.3
Limiting factor: Water temperature (21°C) is outside Brown Trout's preferred range (10–16°C)= 59
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.
Conditions
●Live gauge
Level
0.34 m
Water temp
21.0°C
Estimated
Clarity
Clear
Air temp
24°C
Wind
W 10 km/h
Light breeze
Pressure
1014 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
0.0 mm
No meaningful rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

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.

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 21°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.
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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

Permits & access
Permit required — see local rules.
  • AAPPMA permits.
Directions
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About this water

Small Quimper-area trout river with deep holes holding good trout. Some sea trout possibility in lower sections. Armorican granite geology. Fly-fishing opportunity. Intimate water, not high-volume, but worthwhile for those seeking quiet and wild fish. Spring through early summer best. Check local AAPPMA for access and regulations.

  • Granite
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

EA waterbody FRGR0083

Seasons & zones
  • Salmon1 March → 15 September
  • Trout2nd Saturday of March → 3rd Sunday of September

Salmon: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Sea trout: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Water here around 21°C. Nothing cooler within range — carry a thermometer.
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