Freestone · Mixed · Wyoming/Montana, US

Soda Butte Creek

Soda Butte Creek

Soda Butte is the Lamar's roadside tributary — pocket water and runs you can step into right off the Northeast Entrance road, holding native Yellowstone cutthroat that don't make you work too hard for the privilege.

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.
90% projected
Today's fly
Sculpin Streamer
Sculpin Streamer
Conditions on the water · Today
Live gauge
Level
Falling
0.23 m
Dropping after lift
Water temp8.5°C
ClarityClearing
Weather6°C
WindN 5 km/h
Pressure1022 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
Cool — slow
9°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
Good — water clarity is working for you, but insect activity is the limiting factor today.
Likely species
Hatch timeline · todayPeak at 11am

12pm(now) — Western Blue-Winged Olive

Stage: On emergersApproach: Emerger or dryActivity: 36%
Also:Black Midge31%
Peak emergence window4 food groups active

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

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
Cutthroat Trout fly box
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 (barbless catch-and-release).
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
  1. Soda Butte Creek
  2. Terrain map of the venue
    Terrain map
About this water

Soda Butte is the Lamar's roadside tributary — pocket water and runs you can step into right off the Northeast Entrance road, holding native Yellowstone cutthroat that don't make you work too hard for the privilege. It clears earlier than the main Lamar, so when a storm has the big river the color of coffee, this is often where you go to actually catch something. Barbless catch-and-release under Park rules.

  • Mixed
Conservation note

Native Yellowstone cutthroat — barbless catch-and-release under Park rules.

Water quality · US Clean Water Act
  • Aquatic life: Not assessed
What this classification means

EPA ATTAINS assessment unit 'Soda Butte Creek' (MT43B002_031), 2021 Integrated Report. Aquatic Life use: Insufficient Information. 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) · MT43B002_031

The full read · show the working · for Cutthroat Trout · confidence 75%
How the 68 is built — score × weight = contribution
Temperature54 × 28%15.1
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity44 × 12%5.3
Conditions total= 68
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.
Directions
Seasons & zones
  • Trout Saturday of Memorial Day weekend → First Sunday in November
Related guides
Booking & contacts