Freestone · Mixed · Wyoming

Gardner River

The Gardner River flowing over a rocky bed through an open valley with autumn-colored cottonwoods in Yellowstone.
Prime · Brown Trout
Parachute Adams · 12-18
Primelive now
About as good as it gets
River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% confidence
What moved it
  • Level0.64 mLast reading 2h ago
  • Water temp16.2°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams12-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.64 m
Last reading 2h ago
Water temp16.2°C
ClarityClear
Weather17°C
WindSW 3 km/h
Pressure1018 hPa
Rain · recent1.0 mm
Rain · ahead0.0 mm

Live readings — water temperature is an estimate where the gauge does not record it.

Water temperature for Brown Trout
Warm — slow
16°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 insect activity could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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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
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2
American March BrownHatch
2
3
2

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

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Yellowstone NP licence and special regulations
  • Native-cutthroat catch-and-release rules apply on the upper reaches.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gibbon River
24 km
Brown trout · Rainbow trout · Brook trout
Slough Creek
30 km
Cutthroat trout
Lamar River
36 km
Cutthroat trout
Soda Butte Creek
43 km
Cutthroat trout
Yellowstone River
45 km
24
Brown trout · Rainbow trout · Cutthroat trout
Gallery · 2
  1. The Gardner River flowing over a rocky bed through an open valley with autumn-colored cottonwoods in Yellowstone.
    Gardner River
  2. Terrain map of the venue
    Terrain map
Conservation note

Upper reaches above Osprey Falls hold native cutthroat — barbless catch-and-release under Park rules; handle minimally.

The full read · show the working · for Brown Trout · confidence 90%
How the 81 is built — score × weight = contribution
Temperature95 × 28%26.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Conditions total= 81
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
  • TroutSaturday of Memorial Day weekend → First Sunday in November
Related guides
Euro Nymphingsubsurface methods
Booking & contacts