Tailwater · Mixed · New Hampshire

Androscoggin River — Errol

Wide calm bend of the Androscoggin River near Errol, New Hampshire, with trees in fall color along the banks and lily pads in the foreground water.
Prime · Brook Trout
Slate Drake · 10-14
Primelive now
About as good as it gets
River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% confidence
What moved it
  • Level0.68 mLast reading 8h ago
  • Water temp10.3°C
  • ClarityClear
Today's fly
SD
Slate Drake10-14
Proven pattern for this period
Conditions on the water
Live gauge
Level
Steady
0.68 m
Last reading 8h ago
Water temp10.3°C
ClarityClear
Weather19°C
WindS 14 km/h
Pressure1000 hPa
Rain · recent3.0 mm
Rain · ahead0.0 mm

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

Water temperature for Brook Trout
Ideal
10°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brook 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
Excellent — water temperature is right today, though time of day could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 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
SulphurHatch
2
3
2
Trico (Eastern)Hatch
2
3
3
2
Eastern Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Eastern Summer BWO (Drunella)Hatch
2
3
3
2

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

Ranked for today
Brook Trout fly box
Permits & access
Permit required — see local rules.
  • NH Androscoggin below Errol Dam — verify exact reach open-water dates, tackle and bag/length rules against NH Fish & Game
  • Dam-influenced flow
  • CONSERVATION: native brook trout are heat-sensitive — careful handling and summer thermal restraint.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Rapid River / Rangeley region
16 km
Brook trout
Magalloway River
19 km
Brook trout
Connecticut Lakes / Upper Connecticut River
36 km
Brook trout · Rainbow trout · Brown trout
Gallery · 2
  1. Wide calm bend of the Androscoggin River near Errol, New Hampshire, with trees in fall color along the banks and lily pads in the foreground water.
    Androscoggin River - Errol, New Hampshire
  2. Terrain map of the venue
    Terrain map
Water quality · US Clean Water Act
  • Aquatic life: Not assessed
  • Fish consumption: Impaired
What this classification means

Fish consumption: Consumption advisory (Mercury) — fish for sport, not the table.

EPA ATTAINS assessment unit 'ANDROSCOGGIN RIVER' (NHRIV400010602-04), 2024 Integrated Report. Aquatic Life use: Insufficient Information. Listed impairment causes: Mercury. 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) · NHRIV400010602-04

The full read · show the working · for Brook Trout · confidence 75%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time50 × 13%6.5
Pressure75 × 7%5.3
Insect activity63 × 12%7.6
Conditions total= 82
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
  • Trout1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Booking & contacts