Río Filo Hua Hum is included in the Phase 1 Patagonia visitor pack for junin san martin. This record is engine-shaped but still requires reach-level access, gauge and regulation verification before precise condition scoring.
- Volcanic glacial
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
55% confidence in this read
Live now
Conditions on the water
Trends shown where the gauge supports them
○Regional est.
Level
Dry recently
No gauge reading
Water temp
8.1°C
Estimated
Clarity
Clear
Air temp
5°C
Wind
E 5 km/h
Calm
Pressure
1019 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
10.7 mm
Moderate rain · next 48h
No gauge on this water — readings are regional estimates from weather, not a live gauge.
How to fish · for grayling
The brief
When · where · method · kit
How to fish it · for grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Hatches & runs
What's on, when
Twelve months at a glance
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Today's fly · curated pack
Top pattern + the box
6 patterns from this venue's curated pack
Detail · next 12h
Water temperature & rain
The two readings most likely to move the verdict
Water temperature for grayling
Ideal8°C est.ideal 4–14°C
0°14°28°
The full read
Show the working
How the score is built · what we trust
How the 74 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
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.
About this water
Río Filo Hua Hum, end to end
Field guide · contributor-editedRío Filo Hua Hum · about
What this water is
Background · character · contributors
About this water
Río Filo Hua Hum · directions
How to get to the water
Directions
Río Filo Hua Hum · permits
Good to know
Permits & access
Permit required — see local rules.
- Argentine Patagonian continental permit (or Chilean Sernapesca licence) required
- Rules vary by province, National Park and reach — confirm annexes before fishing.
Río Filo Hua Hum · learn
Related guides
Learn-zone playbooks for this water
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Río Filo Hua Hum
Terrain map
Río Filo Hua Hum is included in the Phase 1 Patagonia visitor pack for junin san martin.
Species
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
55% confidence in this read
Water temperature for grayling
Ideal8°C est.ideal 4–14°C
0°14°28°
The full read · show the working · for grayling · confidence 55%
How the 74 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
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.
Conditions
○Regional est.Level
Dry recently
No gauge reading
Water temp
8.1°C
Estimated
Clarity
Clear
Air temp
5°C
Wind
E 5 km/h
Calm
Pressure
1019 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
10.7 mm
Moderate rain · next 48h
No gauge on this water — readings are regional estimates from weather, not a live gauge.
Evidence
ModelledModerate confidence
Modelled from regional ecology — no survey or occurrence data for this water yet.
How to fish it · for grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Permits & access
Permit required — see local rules.
- Argentine Patagonian continental permit (or Chilean Sernapesca licence) required
- Rules vary by province, National Park and reach — confirm annexes before fishing.
Directions
About this water
Río Filo Hua Hum is included in the Phase 1 Patagonia visitor pack for junin san martin. This record is engine-shaped but still requires reach-level access, gauge and regulation verification before precise condition scoring.
- Volcanic glacial
Other water nearby · 5
Related guides