Coastal Rain River · Granite · British Columbia, CA

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
Today · A side-water session, not the main event
Intruder
Forecast · Today
A side-water session, not the main event
A patient day. Fish the cover and stay with it.
65% projected
Today's fly
Intruder
Intruder
Conditions on the water · Today
Estimate
Level
Dry recently
No gauge reading
Water temp14.0°C
ClarityVery coloured
Weather15°C
WindN 2 km/h
Pressure1015 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
Ideal
14°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
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Caddisflies
Hatch timeline · todayPeak at 11:00

12:00(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 39%
Also:Mahogany Dun22%
Peak emergence window3 food groups active

Peak activity at 11:00 — Reed Smut (Reed Smut, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Supporters see the full sub-surface read.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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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
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.

Ranked for today
Fly box · Cutthroat Trout
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
Other water nearby · 2
Harrison River
8.0 km
79
Cutthroat trout · Bull trout · Coho salmon
Vedder / Chilliwack River
23 km
Steelhead · Rainbow trout · Coho salmon
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 75%
How the 73 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity54 × 12%6.5
Conditions total= 74
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts