Spate · Mixed Sedimentary · West Coast

Grey River / Māwheranui

Grey River / Māwheranui terrain map
Poor · Brown Trout
Hare & Copper Nymph · 12-16
Closed season
Season reopens 1 October. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level0.43 mDropping in the last 6h
  • Water temp8.5°C
  • ClarityClearClearing
Today's fly
Hare & Copper Nymph
Hare & Copper Nymph12-16
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Falling
0.43 m
Dropping in the last 6h
Water temp8.5°C
ClarityClear
Weather5°C
WindNW 3 km/h
Pressure1014 hPa
Rain · recent20.9 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

How these readings are sourced

Weather-only: no live gauge wired. Spate river — fishability is driven by falling/clearing flow after rain. Stale data is dangerous; conditions change fast.

Water temperature for Brown Trout
Cool — slow
9°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown 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.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read 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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
2
2
2
1
1
2
2
Deleatidium / NZ Mayfly DunHatch
3
3
3
3
2
2
3
3
3
Large Dark MayflyHatch
3
3
2
2
3
Burrowing Mayfly / Green MayflyHatch
3
2
2
Caddis / SedgeHatch
3
3
3
2
2
3

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

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • West Coast Fish & Game — a Fish & Game licence is required
  • Check the current Anglers Notice
  • Check Clean Dry (didymo present).
What's coming
Plan ahead
5-day outlook
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature73 × 28%20.4
Flow95 × 22%20.9
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity35 × 12%4.2
Conditions total= 79
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 October (main river); some back-country 1 November → 30 April (back-country) / year-round (lower)

    West Coast Fish & Game licence required. Legal status: guidance_not_permission.

Related guides
Euro Nymphingsubsurface methods
Booking & contacts