Freestone · Mixed · Wyoming, US

Lamar River

The Lamar River winding through Yellowstone's Lamar Valley
Fair · Cutthroat Trout
Parachute Adams · 16-20
Fairlive now
A side-water session, not the main event
Low and clear — careful approach country. Long leader, small flies, slower casts.
75% confidence
What moved it
  • Level0.32 mLast reading 3h ago
  • Water temp5.8°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams16-20
Proven pattern for this period
Conditions on the water
Live gauge
Level
Steady
0.32 m
Last reading 3h ago
Water temp5.8°C
ClarityClear
Weather0°C
WindSE 8 km/h
Pressure1029 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Cutthroat Trout
Cool — slow
5.8°Cideal 9–15°C
0°14°28°
How to fish it · for Cutthroat 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 water temperature could be better.
Likely species
Chironomids
Gammarids
Hatch timeline · todayPeak at 10h

Hatch predictions

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

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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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
Brown DunHatch
2
3
3
3
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2

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

Ranked for today
Fly box · Cutthroat Trout
SD
Sex Dungeon
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
  • Yellowstone NP licence and native-cutthroat rules (often barbless catch-and-release) — check current NPS regulations.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Gardner River
37 km
80
Cutthroat trout · Brown trout · Rainbow trout
Slough Creek
7.0 km
66
Cutthroat trout
Soda Butte Creek
8.0 km
66
Cutthroat trout
Gibbon River
43 km
Brown trout · Rainbow trout · Brook trout
Yellowstone Lake
49 km
Cutthroat trout
Gallery · 2
  1. The Lamar River winding through Yellowstone's Lamar Valley
    Lamar River, Yellowstone National Park
  2. Terrain map of the venue
    Terrain map
Conservation note

Primary species is native Yellowstone cutthroat (Oncorhynchus clarkii bouvieri). A 'cutthroat_trout' species + scoring profile is a Phase 1 deliverable; until added it will not score.

The full read · show the working · for Cutthroat Trout · confidence 75%
How the 64 is built — score × weight = contribution
Temperature46 × 28%12.9
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time55 × 13%7.2
Pressure75 × 7%5.3
Insect activity47 × 12%5.6
Conditions total= 64
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Warmer water — toward the 9–15 °C ideal band — would lift the temperature score.
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