Freestone · Limestone · Utah, US

Logan River

Logan River terrain map

The Logan is the antidote to the tailwater crowds — a tumbling limestone-canyon freestone in northern Utah that holds browns, rainbows and, up in the cold headwater reaches, native Bonneville cutthroat that deserve a careful hand and a quick release.

Tomorrow · About as good as it gets
Sculpin Streamer
Forecast · Tomorrow
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 · Tomorrow
Live gauge
Level
Falling
0.74 m
Dropping after lift
Water temp9.0°C
ClaritySlightly coloured
Weather14°C
WindN 5 km/h
Pressure1012 hPa
Rain · recent1.2 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
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 temperature is right today, though insect activity could be better.
Likely species
Mayflies
Caddisflies
terrestrials
Hatch timeline · tomorrowPeak at 9pm

12pm(now) — Western Blue-Winged Olive

Stage: On emergersApproach: Emerger or dryActivity: 72%
Also:Black Midge68%
Peak emergence windowWeather boost5 food groups active

Peak activity at 9pm — Brown Dun (Brown Dun, Weather boost)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
2
2
2
2
1
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.
  • Open all year
  • The native Bonneville cutthroat in the headwaters are conservation-sensitive — handle with care and verify any cutthroat-specific or upper-reach release rules against UDWR
  • Snowmelt colours it in spring.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Blacksmith Fork River
18 km
Brown trout · Rainbow trout · Cutthroat trout
About this water

The Logan is the antidote to the tailwater crowds — a tumbling limestone-canyon freestone in northern Utah that holds browns, rainbows and, up in the cold headwater reaches, native Bonneville cutthroat that deserve a careful hand and a quick release. It's small-stream fishing the way it's meant to be: dry-dropper through the pockets, attractors the fish actually come up for, careful wading on a bouldery bed. The canyon access is easy off the highway. Spring runoff colours it for a while; once it drops and clears, late spring through autumn, it's a lovely, uncomplicated river that reminds you not every good day needs a famous name on it.

  • Limestone
Water quality · US Clean Water Act
  • Aquatic life: Impaired
  • Recreation: Impaired
What this classification means

Recreation: Bacteria/pathogen advisory — mind wading cuts and immersion.

EPA ATTAINS assessment unit 'Logan River-2' (UT16010203-006_00), 2024 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: pH Acidity Caustic Conditions. 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) · UT16010203-006_00

The full read · show the working · for Cutthroat Trout · confidence 90%
How the 79 is built — score × weight = contribution
Temperature89 × 28%24.9
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time65 × 13%8.5
Pressure75 × 7%5.3
Insect activity61 × 12%7.3
Conditions total= 79
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 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts