Freestone · Limestone · Ontario, CA

Beaver River

Beaver River venue image

The Beaver at Thornbury is a famous, accessible Georgian Bay steelhead river — the dam and fishway draw crowds in spring as lake-run rainbows stack up.

Tomorrow · Slow going — pick your moments
Pheasant Tail Nymph
Forecast · Tomorrow
Slow going — pick your moments
Slow going — pick your moments and do not force it.
45% projected
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph
Conditions on the water · Tomorrow
Proxy gauge
Level
Rising
Proxy
via Saugeen River
Water temp15.0°C
ClarityVery coloured
Weather21°C
WindN 15 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead0.3 mm

No gauge on this water — conditions are inferred from Saugeen River. The trend transfers, the absolute level does not.

Water temperature for Steelhead
Warm — slow
15°C est.ideal 4–13°C
0°14°28°
How to fish it · for Steelhead
When
Spring (peak ~April) and fall steelhead; chinook in autumn.
Where
The Beaver at Thornbury is a famous, accessible Georgian Bay steelhead river — the dam and fishway draw crowds in spring as lake-run rainbows stack up.
Why this works
Good — water clarity is working for you, but water temperature is the limiting factor today.
Likely species
Mayflies
Caddisflies
Hatch timeline · tomorrowPeak at 11am

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 36%
Also:Flying Ants23%
Peak emergence window3 food groups active

Peak activity at 11am — Reed Smut (Reed Smut, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
2
2
2
2
1
Brown DunHatch
2
3
3
3
3
3
3
2
Quill GordonHatch
2
2
Blue QuillHatch
2
3
2
HendricksonHatch
2
2

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

Ranked for today
Steelhead fly box
SS
Steelhead stonefly nymph
14–16 · Nymph
Search the runs and pockets, dead-drift near the bottom.
SI
Small Intruder
12–16 · Fly
A dependable searching pattern for these waters.
Permits & access
Permit required — see local rules.
  • Dam/fishway and sanctuary rules; FMZ 16 seasons
  • Verify current OFRS.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Bighead River
12 km
30
Steelhead · Chinook salmon
Sydenham River (Owen Sound)
38 km
30
Steelhead · Chinook salmon
Nottawasaga River
40 km
Steelhead · Brown trout · Chinook salmon
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The Beaver at Thornbury is a famous, accessible Georgian Bay steelhead river — the dam and fishway draw crowds in spring as lake-run rainbows stack up. Smaller than the Saugeen or Nottawasaga, it concentrates fish in its lower reaches and is a reliable, if popular, spring-and-fall steelhead venue with autumn chinook.

Under the surface

The Beaver enters Georgian Bay at Thornbury, where the dam and fishway are a famous spring steelhead spectacle. A smaller, accessible river below the Niagara Escarpment, it runs strong spring and fall lake-run rainbows with chinook in autumn, and concentrates fish in its lower reaches and dam pool.

Wading: Strong spring flows, crowds at the dam

  • Limestone
  • Partly confined
  • Pool riffle
  • Medium river
Conservation note

Naturalised lake-run steelhead and chinook (retention provincially regulated). The Thornbury fishway concentrates and protects spawners — observe sanctuary rules. Clean-Drain-Dry.

Why this score · for Steelhead
  • Temperature3828% weight
  • Flow8022% weight
  • Clarity9518% weight
  • Feeding Time6513% weight
  • Pressure757% weight
  • Insect activity6612% weight
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Booking & contacts