Freestone · Mixed · Montana, US

Yellowstone River

At Grey Bear - Yellowstone River - Crazy Mountains - Montana - 2013-07-07

Through Paradise Valley the Yellowstone is big, honest freestone water — browns, rainbows, and Yellowstone cutthroat all sharing the same long runs and bank seams.

Today · About as good as it gets
Sculpin Streamer
Forecast · Today
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% projected
Today's fly
Sculpin Streamer
Sculpin Streamer
Conditions on the water · Today
Live gauge
Level
Falling
0.02 m
Dropping after lift
Water temp9.5°C
ClarityClearing
Weather8°C
WindN 16 km/h
Pressure1025 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Cutthroat Trout
Ideal
10°C est.ideal 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
Excellent — water temperature is right today, though insect activity could be better.
Likely species
Hatch timeline · todayPeak at 11am

12pm(now) — Western Blue-Winged Olive

Stage: On emergersApproach: Emerger or dryActivity: 44%
Also:Black Midge28%
Peak emergence window5 food groups active

Peak activity at 11am — Western Blue-Winged Olive (Western Blue-Winged Olive, Peak emergence window)

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

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
Trout seasonSeason
2
1
1
2
2
2
2
2
2
2
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
Cutthroat Trout fly box
SD
Sex Dungeon
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
  • Montana licence
  • Frequently unfishable through June runoff
  • Handle native cutthroat gently and release.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
  1. At Grey Bear - Yellowstone River - Crazy Mountains - Montana - 2013-07-07
  2. Terrain map of the venue
    Terrain map
About this water

Through Paradise Valley the Yellowstone is big, honest freestone water — browns, rainbows, and Yellowstone cutthroat all sharing the same long runs and bank seams. The Mother's Day caddis and the post-runoff salmonfly and golden stone hatches are the events people drive for. The catch is late spring, when a long, muddy runoff window owns the river and there's nothing to do but wait it out.

Under the surface

The Yellowstone is the longest undammed river left in the lower forty-eight, and it earns the title the hard way — from its source south of the park, through Yellowstone Lake, over the two great falls and down the Grand Canyon of the Yellowstone with its yellow rhyolite walls, then out across Paradise Valley beneath the Absarokas toward Livingston and the plains. The fishing river is the freestone below the park: a big, brawling, cottonwood-lined flood that rises hard and brown with the June snowmelt and drops into shape by July. The bed is rounded volcanic and granitic cobble, the lies in the riffle corners and along the cut banks. This is native cutthroat water at heart, sharing the run now with browns and rainbows. Wading is honest work on slick freestone, and the river runs higher and faster than your eye keeps telling you.

Wading: Fast, high water over slick freestone

  • Mixed
  • Unconfined
  • Pool riffle
  • Large river
Water quality · US Clean Water Act
  • Aquatic life: Impaired
What this classification means

EPA ATTAINS assessment unit 'Yellowstone River' (MT43B003_010), 2021 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Habitat Alterations. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.

Status is for the Clean Water Act assessment unit covering this reach.

EPA ATTAINS (Clean Water Act) · MT43B003_010

The full read · show the working · for Cutthroat Trout · confidence 90%
How the 83 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity63 × 12%7.6
Conditions total= 83
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Seasons & zones
  • Trout Third Saturday of May → Last day of February
Related guides
Booking & contacts