Spate · Granite · Honshū, JP

Miomote River

Miomotegawa river
Tomorrow · Slow going — pick your moments
Black Gnat
Forecast · Tomorrow
Slow going — pick your moments
Slow going — pick your moments and do not force it.
80% projected
Today's fly
Black Gnat
Black Gnat
Conditions on the water · Tomorrow
Estimate
Level
Very heavy rain recently
No gauge reading
Water temp16.9°C
ClarityVery coloured
Weather20°C
WindN 8 km/h
Pressure1019 hPa
Rain · recent50.0 mm
Rain · ahead0.0 mm

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

Water temperature for White-spotted Char
Warm — slow
17°C est.ideal 7–14°C
0°14°28°
How to fish it · for White-spotted Char
When
Late spring after the thaw, into autumn
Where
The Miomote falls out of the snow country of northern Niigata, a powerful river famed for the sea-run cherry salmon — sakuramasu — that climb it in spring,…
Why this works
Water at 17°C — above the white-spotted char caution line (16°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · tomorrowPeak at 18:00

12:00(now) — Heather Fly

Stage: Terrestrials on topApproach: Dry flyActivity: 64%
Also:Reed Smut49%Glossosoma (Japan)47%Isonychia japonica32%
Peak emergence windowWeather boost10 food groups active

Peak activity at 18:00 — Stenopsyche Caddis (Stenopsyche Caddis, Weather boost)

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
Cicada (Semi)Hatch
2
2
Stenopsyche CaddisHatch
2
3
3
2
Autumn DunHatch
2
3
2
Ephemera strigata (Mid-Reach Keiryu Mayfly)Hatch
2
3
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Fly box · White-spotted Char
EH
Elk Hair / Stenopsyche caddis
12–14 · Sedge
Evening sedge — twitch or dead-drift it as the light goes.
CB
Cicada & beetle terrestrials (midsummer)
10–12 · Terrestrial
Fish it tight to the bank on warm, breezy days.
Permits & access
Permit required — see local rules.
  • Co-operative yugyoken required; sakuramasu are often specially regulated or restricted — verify before targeting
  • Spawning closure in autumn.
What's coming
Plan ahead
5-day outlook
Water here around 17°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Miomotegawa river
    River in Niigata Prefecture.
  2. Terrain map of the venue
    Terrain map
Conservation note

White-spotted char (iwana), yamame, and the sea-run cherry salmon sakuramasu (the migratory form of yamame); sakuramasu are conservation-sensitive and often restricted.

The full read · show the working · for White-spotted Char · confidence 80%
How the 0 is built — score × weight = contribution
Temperature19 × 28%5.3
Flow15 × 22%3.3
Clarity0 × 18%0.0
Feeding Time55 × 13%7.2
Pressure75 × 7%5.3
Insect activity50 × 12%6.0
Limiting factor: Water is unfishable — too coloured for White-spotted Char= 27
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 7–14 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Char late February to April → late September to mid-October

    Honshu/Shikoku/Kyushu keiryu are managed by local fishery co-operatives — a yugyoken (day/annual ticket) is required, and most streams close around 30 September / mid-October for spawning. Species are surfaced in prose only (no engine slugs for yamame, amago or iwana). Legal status: guidance_not_permission.

Related guides
Euro Nymphingsubsurface methods
Booking & contacts