Freestone · Mixed · Utah

Fremont River

The Fremont River flowing over a rocky bed through a red rock canyon in Capitol Reef National Park, Utah.

The Fremont is the trout river of Utah's red-rock heart — the water that threads down out of the Boulder/Thousand Lake high country through Bicknell and on toward the slickrock of Capitol Reef, the only real cold-water fly stream for a long way in any direction.

Marginal · Brown Trout
Chubby Chernobyl · 6-10
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level1.23 mLast reading 12h ago
  • Water temp18.4°C
  • ClarityClear
Today's fly
Chubby Chernobyl
Chubby Chernobyl6-10
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
1.23 m
Last reading 12h ago
Water temp18.4°C
ClarityClear
Weather20°C
WindW 9 km/h
Pressure1019 hPa
Rain · recent0.5 mm
Rain · ahead5.9 mm

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

Water temperature for Brown Trout
Warm — slow
18°C est.ideal 1016°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
Water at 18.4°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
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

Top nymph shown — see all 2 guilds 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
Trout seasonSeason
1
2
2
2
2
2
2
2
2
2
2
1
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.
  • Open all year (statewide default)
  • Verify current UDWR gear/limit rules
  • Flow on the upper trout reach is dam- and diversion-influenced (Mill Meadow / Johnson Valley) and can run low and warm in late summer — a thermal-welfare caution applies; fish early in heat
  • The river below Bicknell is warm desert water, not a trout fishery.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. The Fremont River flowing over a rocky bed through a red rock canyon in Capitol Reef National Park, Utah.
    Fremont River at Capitol Reef NP in Utah
  2. Terrain map of the venue
    Terrain map
About this water

The Fremont is the trout river of Utah's red-rock heart — the water that threads down out of the Boulder/Thousand Lake high country through Bicknell and on toward the slickrock of Capitol Reef, the only real cold-water fly stream for a long way in any direction. The fishable part is the upper reach, below Mill Meadow, where the river runs cool and clear enough to hold browns and rainbows through meadow runs and willow-lined corners with the Aquarius Plateau standing over your shoulder. It's a working river as much as a fishing river — dams and irrigation shape the flows, and in a dry late summer it can drop and warm to the point where the responsible move is to fish early and leave the fish alone in the heat. But on a good day in a good season it's a quietly lovely freestone with the most spectacular backdrop in the state, and almost nobody on it. Below Bicknell the river warms, silts and turns into desert water — that's where the trout story ends and the scenery one carries on.

  • Mixed
Water quality · US Clean Water Act
  • Aquatic lifeImpaired
  • RecreationImpaired
What this classification means

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

EPA ATTAINS assessment unit 'Fremont River-3' (UT14070003-008_00), 2024 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Temperature, Pathogens. 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) · UT14070003-008_00

The full read · show the working · for Brown Trout · confidence 80%
How the 38 is built — score × weight = contribution
Temperature49 × 28%13.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 70
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout1 January31 December
Related guides
Booking & contacts