Coastal Rain River · Granite · British Columbia, CA

Harrison River

Chehalis Flats, Harrison Mills, B.C
Prime · Cutthroat Trout
Black Ghost · 12–14
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
90% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp9.4°C
  • ClarityClear
Today's fly
Black Ghost
Black Ghost12–14
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp9.4°C
ClarityClear
Weather11°C
WindNE 2 km/h
Pressure1017 hPa
Rain · recent5.9 mm
Rain · ahead28.6 mm

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

Water temperature for Cutthroat Trout
Ideal
9°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 time of day could be better.
Likely species
Mayflies
Chironomids
Gammarids
Hatch timeline · todayPeak at 21 Uhr

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour as a supporter.

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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

Top prey shown — see all 2 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 · October 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.
  • Dolly Varden protected/C&R; salmon DFO-regulated
  • Verify current BC regs (Region 2) and DFO notices.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Chehalis River
8.0 km
82
Steelhead · Cutthroat trout · Coho salmon
Vedder / Chilliwack River
15 km
Steelhead · Rainbow trout · Coho salmon
Skagit River (BC)
60 km
Rainbow trout · Bull trout
Gallery · 2
  1. Chehalis Flats, Harrison Mills, B.C
  2. Terrain map of the venue
    Terrain map
Conservation note

Trophy sea-run cutthroat and bull trout / Dolly Varden (char, protected, C&R) following huge autumn salmon runs; salmon DFO-regulated. Clean-Drain-Dry.

The full read · show the working · for Cutthroat Trout · confidence 90%
How the 81 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time55 × 13%7.2
Pressure75 × 7%5.3
Insect activity64 × 12%7.7
Conditions total= 81
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