Freestone · Limestone · British Columbia

St. Mary River

St. Mary River terrain map
Prime · Cutthroat Trout
Parachute Adams · 12-18
Primelive now
About as good as it gets
River high but settled. Coloured water — fish bigger and deeper, confident takes down the seams.
90% confidence
What moved it
  • LevelProxyvia Upper Kootenay River
  • Water temp14.7°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams12-18
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Upper Kootenay River
Water temp14.7°C
ClarityClear
Weather16°C
WindW 12 km/h
Pressure1013 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

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

Water temperature for Cutthroat Trout
Ideal
15°C est.ideal 9–15°C
0°14°28°
How to fish it · for Cutthroat 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
Excellent — water temperature is right today, though insect activity could be better.
Hatch timeline · todayPeak at 10am

Hatch predictions

Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2
American March BrownHatch
2
3
2

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

Ranked for today
Cutthroat Trout fly box
Permits & access
Permit required — see local rules.
  • Native-trout C&R, classified rules in places, bull trout protected
  • Verify current BC regs (Region 4).
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Bull River
33 km
Cutthroat trout · Bull trout
Upper Kootenay River
37 km
82
Cutthroat trout · Bull trout · Rainbow trout
Conservation note

Native westslope cutthroat (Threatened, C&R) and bull trout (char, protected, C&R), with some rainbows. Whirling disease/didymo concerns — Clean-Drain-Dry.

The full read · show the working · for Cutthroat Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time75 × 13%9.8
Pressure75 × 7%5.3
Insect activity64 × 12%7.7
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Upper Kootenay Riverproxy
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 15 June → 31 October
Related guides
Euro Nymphingsubsurface methods
Booking & contacts