Coastal Rain River · Granite · British Columbia

Chehalis River

Wide wetland landscape of the Chehalis Flats near Harrison Mills, British Columbia, with braided water channels through marsh grass and mist-shrouded mountains in the background
Poor · Cutthroat Trout
Black Beetle · 12-14
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.2°C
  • ClarityClear
Today's fly
Black Beetle
Black Beetle12-14
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.2°C
ClarityClear
Weather25°C
WindS 6 km/h
Pressure1014 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Cutthroat Trout
Warm — slow
22°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
Water at 22.2°C. This is the line where catch-and-release kills cutthroat trout. Do not fish for them today.
Hatch timeline · todayPeak at 7am

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

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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 · August 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
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.
  • Retain marked hatchery steelhead where permitted; release wild; gear restrictions
  • Verify current BC regs (Region 2).
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Wide wetland landscape of the Chehalis Flats near Harrison Mills, British Columbia, with braided water channels through marsh grass and mist-shrouded mountains in the background
    Chehalis Flats near Harrison Mills, where the Chehalis River meets the Fraser Valley
  2. Terrain map of the venue
    Terrain map
Conservation note

Mixed hatchery and wild winter steelhead (retain marked hatchery only where permitted; release wild); cutthroat and salmon present. Clean-Drain-Dry.

The full read · show the working · for Cutthroat Trout · confidence 90%
How the 2 is built — score × weight = contribution
Temperature1 × 28%0.3
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure75 × 7%5.3
Insect activity62 × 12%7.4
Limiting factor: Water temperature (22.2°C) is outside Cutthroat Trout's preferred range (9–15°C)= 52
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 9–15 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts