Spring Creek · Volcanic · Northern California

Hat Creek

Autumn colours along Hat Creek in Lassen Volcanic National Park, golden foliage reflected in the creek.

The famous Wild Trout flat below Powerhouse 2 — a spring-fed, glassy meadow stream where California's whole wild-trout management idea got started.

Poor · Rainbow Trout
Green Drake · 10-12
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.2°C
  • ClarityClear
Today's fly
Green Drake
Green Drake10-12
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.2°C
ClarityClear
Weather22°C
WindSW 7 km/h
Pressure1015 hPa
Rain · recent0.0 mm
Rain · ahead0.5 mm

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

Water temperature for Rainbow Trout
Warm — slow
22°C est.ideal 1018°C
0°14°28°
How to fish it · for Rainbow 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
Water at 22.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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 · July 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
Rainbow Trout fly box
Permits & access
Permit required — see local rules.
  • CDFW Wild Trout regulations — verify gear and limit rules.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
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
About this water

The famous Wild Trout flat below Powerhouse 2 — a spring-fed, glassy meadow stream where California's whole wild-trout management idea got started. Cold, clear water and wild rainbows and browns that have read all the books, so this is hatch-matching with fine tippet and downstream presentations, the kind of fishing that makes you feel either very good or very foolish. In high summer it warms up, so do your fishing in the morning and let the river rest in the heat.

Under the surface

Hat Creek is where California decided wild trout were worth protecting — the section below Hat Creek Powerhouse became the state's first designated Wild Trout water, and it set the template for everything after. It's a spring-fed creek of the volcanic country near Mount Lassen, running clear and cold and even out of the porous lava, the lower 'flat' a smooth, weed-rich spring-creek glide where the wild rainbows and browns sip insects with spring-creek fussiness. The bed is volcanic sand, gravel and rooted weed; the water is glassy and demanding, every drift on display. Above the flat it's quicker, rougher pocket water over basalt. The geology is all Cascade volcanics, and the springs keep it temperate year-round. Wading the flat is a careful, often-resisted business on soft footing — mostly you wade slow, cast long, and accept that the fish saw you first.

Wading: Soft footing, glassy exposure on the flat

  • Volcanic
  • Unconfined
  • Spring creek
  • Pool riffle
The full read · show the working · for Rainbow Trout · confidence 90%
How the 15 is built — score × weight = contribution
Temperature9 × 28%2.5
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time55 × 13%7.2
Pressure75 × 7%5.3
Insect activity47 × 12%5.6
Limiting factor: Water temperature (22.2°C) is outside Rainbow Trout's preferred range (10–18°C)= 49
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • TroutLast Saturday in April15 November
Related guides
Booking & contacts