- Ecology: Unknown
- Chemical: Unknown
Rules at a glance
- Permit required
How to fish it · for Rainbow
When
March–June, then September
Where
Start with Buzzers (12-14) on a slow, natural presentation — check locally for the preferred method. Early in the day, try buzzers on a slow figure-of-eight or a booby on a fast-sink line near the bottom. Rainbows respond to more active retrieves — try short strips between pauses.
The plan
Plan A
Start with Buzzers (12-14) on a slow, natural presentation — check locally for the preferred method. Early in the day, try buzzers on a slow figure-of-eight or a booby on a fast-sink line near the bottom. Rainbows respond to more active retrieves — try short strips between pauses.
Plan B
Fish early and late, try deeper during the heat of the day with a fast-sinking line.
Watch for
Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.
Bank
Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 5 with Pro.
Start free trial14-day free trial. Cancel anytime.
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
2
1
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Rainbow fly box
Top
8-12 · Pattern
Retrieve
Permits & access
Permit required — see local rules.
- Carte de pêche
- Small association fly reservoir.
What's coming
Plan ahead
5-day outlook
Condition match
38%
Cloud25%
Wind30%
Temp60%
Conditions are away from Parc Er Bihan (Colpo)'s sweet spot — it usually fishes best in ripple wind with cloud skies.
Other water nearby · 3
Water quality (WFD)
Why this score
- Wind conditions (windy) are not ideal for this water.
- Terrestrials are in their seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
- Trout 2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts
Permits & access
Parc Er Bihan (Colpo)
How to fish it · for Rainbow
When
March–June, then September
Where
Start with Buzzers (12-14) on a slow, natural presentation — check locally for the preferred method. Early in the day, try buzzers on a slow figure-of-eight or a booby on a fast-sink line near the bottom. Rainbows respond to more active retrieves — try short strips between pauses.
The plan
Plan A
Start with Buzzers (12-14) on a slow, natural presentation — check locally for the preferred method. Early in the day, try buzzers on a slow figure-of-eight or a booby on a fast-sink line near the bottom. Rainbows respond to more active retrieves — try short strips between pauses.
Plan B
Fish early and late, try deeper during the heat of the day with a fast-sinking line.
Watch for
Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.
Bank
Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 5 with Pro.
Start free trial14-day free trial. Cancel anytime.
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
2
1
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Rainbow fly box
Top
8-12 · Pattern
Retrieve
Permits & access
Permit required — see local rules.
- Carte de pêche
- Small association fly reservoir.
What's coming
Plan ahead
5-day outlook
Condition match
38%
Cloud25%
Wind30%
Temp60%
Conditions are away from Parc Er Bihan (Colpo)'s sweet spot — it usually fishes best in ripple wind with cloud skies.
Other water nearby · 3
Water quality (WFD)
- Ecology: Unknown
- Chemical: Unknown
Why this score
- Wind conditions (windy) are not ideal for this water.
- Terrestrials are in their seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
- Trout 2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts
Permits & access