Freestone · Limestone · Alberta

Oldman River (headwaters, above the reservoir)

Oldman River (headwaters, above the reservoir) — Oldman river-Alberta
Marginal · Rainbow Trout
Parachute Adams · 12-18
Marginallive now
Slow going — pick your moments
River high but settled. Slow going — pick your moments and do not force it.
80% confidence
What moved it
  • Level5.97 mLast reading 19h ago
  • Water temp20.2°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams12-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
5.97 m
Last reading 19h ago
Water temp20.2°C
ClarityClear
Weather27°C
WindW 19 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead0.2 mm

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

Water temperature for Rainbow Trout
Warm — slow
20°C est.ideal 10–18°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 20.2°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Mayflies
  • Large dark oliveMost likely
    #14–16 · Emerger
    Dead-drift the emerger — it's sitting in the film.
  • Green drakeAlso possible
    #8–10 · Dun
    Duns are up — the Spent Gnat spinners fall at dusk.
  • Blue-winged oliveAlso possible
    #16–18 · Dun
    Duns are up; a sherry spinner fall may follow.
  • Iron BlueAlso possible
    #16–18 · Dun
    Cold, grey day — the dun sits long. Good dry-fly water.
Caddisflies
  • GrannomMost likely
    #14–16 · Pupa
    Pupa first, then dries as the adults come off.
  • Satin sedgeAlso possible
    #12–14 · Egg-laying
    Skitter it at dusk — this one's fished, not dead-drifted.
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

Top prey shown — see all 3 with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Updated 7 hours ago

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
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.
  • Native-trout C&R, bait bans, mid-June spawning closure, bull trout zero limit
  • Verify current Alberta regs (Zone ES2).
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 20°C — probably warm enough to stress Rainbow Trout . These are likely cooler.
Castle River
23 km
~14°C
Cutthroat trout · Bull trout · Rainbow trout
Gallery · 2
  1. Oldman River (headwaters, above the reservoir) — Oldman river-Alberta
    Oldman river-Alberta
  2. Terrain map of the venue
    Terrain map
Conservation note

Native westslope cutthroat (SARA Threatened — catch-and-release) and bull trout (char, zero limit, catch-and-release). This is conservation water; we never score these natives as harvest. Whirling disease present in the Oldman basin — Clean-Drain-Dry.

The full read · show the working · for Rainbow Trout · confidence 80%
How the 26 is built — score × weight = contribution
Temperature40 × 28%11.2
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure75 × 7%5.3
Insect activity62 × 12%7.4
Conditions total= 67
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 16 June → 31 October
Related guides
Euro Nymphingsubsurface methods
Booking & contacts