Freestone · Schist · Otago

Clutha / Mata-Au

Clutha / Mata-Au terrain map
Terrain map

The Clutha / Mata-Au is the big stable giant of the South Island — New Zealand's largest river by flow, lake-fed from Wānaka and Hāwea and held by the Clyde and Roxburgh dams, so it runs big and clear where rain-fed rivers blow out.

Species

A proper day on the water

Low and clear — careful approach country. Stay small, stay accurate.

The water's still cold, about 9°C, sitting at a steady height, running clear.

90% confidence in this read
Water temperature for brown trout
Cool — slow
9°C est.ideal 10–16°C
0°14°28°
The full read · show the working · for brown trout · confidence 90%
How the 78 is built — score × weight = contribution
Temperature80 × 28%22.4
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Conditions total= 78
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Conditions
○Regional est.
Level
Moderate rain recently
No gauge reading
Water temp
8.9°C
Estimated
Clarity
Clear
Air temp
6°C
Wind
NE 10 km/h
Light breeze
Pressure
1009 hPa
Rain · 48h
10.7 mm
Moderate rain
Rain · ahead
0.0 mm
No meaningful rain · next 48h

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

Weather-only: no live gauge wired. Lake-fed and dam-regulated — flow is governed by lake levels and hydro operation, not recent rain. Watch for sudden dam-driven level changes.

Hatch timeline · todayPeak at 1pm

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.

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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.
Why this works
Good — water clarity is right today, though time of day could be better.
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Stenopsyche CaddisHatch
2
3
3
2
Cicada (Semi)Hatch
2
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2

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

Permits & access
Permit required — see local rules.
  • Otago Fish & Game region — a Fish & Game licence is required
  • Beware dam-controlled flow changes
  • Check the current Anglers Notice
  • Check Clean Dry (didymo present).
Directions
Apple MapsGoogle Maps
About this water

The Clutha / Mata-Au is the big stable giant of the South Island — New Zealand's largest river by flow, lake-fed from Wānaka and Hāwea and held by the Clyde and Roxburgh dams, so it runs big and clear where rain-fed rivers blow out. It holds large brown and rainbow trout, fished from the wadeable margins, the side-braids and the slower edges rather than the heavy main flow. A powerful river to be respected; its size and regulation make it a reliable option when others are out.

Under the surface

New Zealand's largest river by volume, the Clutha / Mata-Au pours green and powerful out of Lakes Wānaka and Hāwea and drives through the schist gorges and orchards of Central Otago to the Pacific. Lake-fed and dam-held, it runs big and stable where lesser rivers rise and fall, its margins and side-braids holding large brown and rainbow trout.

Wading: Very powerful big river current, dam controlled level changes — wade margins only, great care

  • River
  • Schist
  • Partly confined
  • Large river
  • Glide
Seasons & zones
  • Troutyear-round (most reaches) → year-round
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