- Permit required
- Fly only
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.
Buzzer may strengthen through the middle of the day as conditions warm.
Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.
Hatch predictions
Top nymph shown — see all 3 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 5 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
- APBV permit required
- No-kill, fly-only, barbless/de-barbed hooks, landing net mandatory
- Verify rules and ticket availability with the association before fishing.
A reasonable day here, though temperature isn't quite in the sweet spot.

Lac de Gravelle, Bois de Vincennes Terrain map
- Wind conditions (ripple) closely match what this water fishes best in.
- Buzzer is in its seasonal window, boosting the chance of targeted feeding.
- Trout Year-round → Year-round
Lac de Gravelle

Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.
Buzzer may strengthen through the middle of the day as conditions warm.
Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.
Hatch predictions
Top nymph shown — see all 3 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 5 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
- APBV permit required
- No-kill, fly-only, barbless/de-barbed hooks, landing net mandatory
- Verify rules and ticket availability with the association before fishing.
A reasonable day here, though temperature isn't quite in the sweet spot.

Lac de Gravelle, Bois de Vincennes Terrain map
- Wind conditions (ripple) closely match what this water fishes best in.
- Buzzer is in its seasonal window, boosting the chance of targeted feeding.
- Trout Year-round → Year-round