Spring Creek · Volcanic · Northern California, US

Hat Creek

Autumn colours along Hat Creek in Lassen Volcanic National Park, golden foliage reflected in the creek.
Prime · Brown Trout
Blue Winged Olive · 18-22
Primelive now
About as good as it gets
River dropping into shape after a lift. The kind of afternoon you remember — a weighted nymph through the clearing seams, the dry as it settles.
90% confidence
What moved it
  • LevelProxyvia Pit River
  • Water temp14.1°C
  • ClarityClear
Today's fly
Blue Winged Olive
Blue Winged Olive18-22
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Pit River
Water temp14.1°C
ClarityClear
Weather7°C
WindS 8 km/h
Pressure1022 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from Pit River. The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Ideal
14°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.
Why this works
Excellent — water temperature is right today, though time of day could be better.
Likely species
Mayflies
Chironomids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour as a supporter.

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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 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
1
Western Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Pale Morning DunHatch
2
3
3
2
TricoHatch
2
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2

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

Ranked for today
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
  • CDFW Wild Trout regulations — verify gear and limit rules.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Baum Lake
7.0 km
Rainbow trout · Brown trout
Pit River
11 km
Rainbow trout
Fall River
15 km
Rainbow trout
Fall River
15 km
Rainbow trout
Lake Britton
18 km
Rainbow trout · Brown trout
Gallery · 2
  1. Autumn colours along Hat Creek in Lassen Volcanic National Park, golden foliage reflected in the creek.
    Autumn colours on Hat Creek
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 90%
How the 83 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Conditions total= 83
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Pit Riverproxy
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 Letzter Saturday in April → 15 November
Related guides
Euro Nymphingsubsurface methods
Booking & contacts