Tailwater · Mixed · Wyoming, US

Lewis River

Lewis River Yellowstone NP Wyoming 2024
Good · Brook Trout
RS2 · 18-22
Goodlive now
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp7.9°C
  • ClarityClear
Today's fly
RS2
RS218-22
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp7.9°C
ClarityClear
Weather0°C
WindSW 8 km/h
Pressure1029 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

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

Water temperature for Brook Trout
Cool — slow
8°C est.ideal 10–16°C
0°14°28°

A dam sets this river's temperature, not the weather, so it can shift several degrees within hours when the release changes. It also warms as it runs away from the dam.

How to fish it · for Brook 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.
Likely species
Mayflies
Chironomids
Gammarids
Hatch timeline · todayPeak at 10h

Hatch predictions

Today's headline hatch shown — see all 4 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 3 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
Western Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Pale Morning DunHatch
2
3
3
2
TricoHatch
2
3
2
Black MidgeHatch
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 · Brook Trout
Permits & access
Permit required — see local rules.
  • Yellowstone NP licence and special regulations
  • Handle spawning browns minimally — the fall run is the headline.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Lewis Lake
1.0 km
Brown trout
Shoshone Lake
10 km
Brown trout
Firehole River
28 km
Brown trout · Rainbow trout
Yellowstone Lake
30 km
Cutthroat trout
Gibbon River
48 km
83
Brown trout · Rainbow trout · Brook trout
Gallery · 2
  1. Lewis River Yellowstone NP Wyoming 2024
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brook Trout · confidence 90%
How the 76 is built — score × weight = contribution
Temperature70 × 28%19.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity75 × 12%9.0
Conditions total= 76
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Saturday de Memorial Day weekend → Premier Sunday in November
Related guides
Euro Nymphingsubsurface methods
Booking & contacts