Freestone · Volcanic · Eastern Sierra

Upper Owens River

The Upper Owens River in winter with sunlight reflections on the water, Long Valley, Mono County.

The Upper Owens is a meandering high-desert meadow river feeding into Crowley, and it carries one of the Eastern Sierra's worst-kept secrets: big lake-run browns and rainbows that run up out of the reservoir to spawn and feed.

Poor · Rainbow Trout
Parachute Adams · 12-18
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.0°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams12-18
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.0°C
ClarityClear
Weather24°C
WindW 17 km/h
Pressure1014 hPa
Rain · recent0.0 mm
Rain · ahead3.9 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Rainbow Trout
Warm — slow
22°C est.ideal 1018°C
0°14°28°
How to fish it · for Rainbow 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 22°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
Rainbow Trout fly box
Permits & access
Permit required — see local rules.
  • Year-round on the open reaches, but reach-specific seasonal/gear rules apply near the Crowley inflow — verify against CDFW
  • SPAWNING ETHICS: big lake-run fish are often on redds; do not target spawners or wade on spawning beds.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Probably above the Rainbow Trout safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
  1. The Upper Owens River in winter with sunlight reflections on the water, Long Valley, Mono County.
    Upper Owens in winter
  2. Terrain map of the venue
    Terrain map
About this water

The Upper Owens is a meandering high-desert meadow river feeding into Crowley, and it carries one of the Eastern Sierra's worst-kept secrets: big lake-run browns and rainbows that run up out of the reservoir to spawn and feed. It's a year-round fishery with easy access and genuine quality, fishable with nymphs, streamers and — when the fish are looking up — dries over rising trout in the undercut meadow bends. A word on ethics: those big migratory fish are often on or near redds, and standing on a spawning bed to chase a hen is bad form and bad for the river. Fish the runs and holding water, leave the spawners be, and the Upper Owens stays the quiet gem it is.

  • Volcanic
Water quality · US Clean Water Act
  • Aquatic lifeNot assessed
  • RecreationImpaired
What this classification means

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

EPA ATTAINS assessment unit 'Owens River (Long HA)' (CAR6031009020011204130840), 2024 Integrated Report. Aquatic Life use: Insufficient Information. Listed impairment causes: 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) · CAR6031009020011204130840

The full read · show the working · for Rainbow Trout · confidence 90%
How the 15 is built — score × weight = contribution
Temperature11 × 28%3.1
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity57 × 12%6.8
Limiting factor: Water temperature (22°C) is outside Rainbow Trout's preferred range (10–18°C)= 53
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 10–18 °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