Freestone · Limestone · British Columbia, CA

St. Mary River

St. Mary River terrain map

The St.

Today · About as good as it gets
Orange Stimulator
Forecast · Today
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% projected
Today's fly
Orange Stimulator
Orange Stimulator
Conditions on the water · Today
Proxy gauge
Level
Steady
Proxy
via Upper Kootenay River
Water temp10.9°C
ClarityClear
Weather13°C
WindN 3 km/h
Pressure1012 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 Bull Trout
Ideal
11°C est.ideal 6–12°C
0°14°28°
How to fish it · for Bull 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 working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Caddisflies
Hatch timeline · todayPeak at 6pm

12pm(now) — Mahogany Dun

Stage: On emergersApproach: Emerger or dryActivity: 87%
Also:Reed Smut36%
Peak emergence window7 food groups active

Peak activity at 6pm — October Caddis (October Caddis, Degree-days at peak)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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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 · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Brown DunHatch
2
3
3
3
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2

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

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
Upper Kootenay River
32 km
Cutthroat trout · Bull trout · Rainbow trout
Bull River
37 km
81
Cutthroat trout · Bull trout
About this water

The St. Mary is a fine, less-pressured Kootenay cutthroat river near Kimberley — clear limestone freestone with riffles, runs and a good canyon, holding native westslope cutthroat and bull trout with some rainbows. It fishes as excellent summer and autumn dry-fly water once it drops into shape, a worthy sibling to the nearby Elk.

Under the surface

The St. Mary near Kimberley and Cranbrook is a clear, lively Kootenay freestone holding native westslope cutthroat and bull trout with some rainbows — riffles, runs and a fine canyon section in big mountain country. A worthy companion to the Elk, less pressured, with excellent summer and autumn dry-fly fishing once the river drops into shape.

Wading: Swift cold water, slick rock, flashy after storms

  • Limestone
  • Confined
  • Pool riffle
  • Pocket water
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 Bull Trout · confidence 75%
How the 80 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity60 × 12%7.2
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Upper Kootenay Riverproxy
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 15 June → 31 October
Related guides
Euro Nymphingsubsurface methods
Booking & contacts