A small, cold afterbay below Trinity Dam, kept frigid year-round by the deep, dark water it draws off the bottom of Trinity Lake — which is exactly why the trout grow so well in it. It's a no-motor (or trolling-motor only) pond, best worked from a pram or a tube, and it fishes when the freestones around it are too warm or too high. Midges and Callibaetis are the staples, with leeches and damsels working the drop-offs. Quiet, cold, scenic water with a steady reputation for fat rainbows and the odd big brown.
Hot — dawn and dusk onlySustained heat. Fish deep, handle carefully, stop if a fish struggles.
The air has been hot long enough for the whole surface to be warm. There is no water sensor here, so we cannot tell you the depths are safe — only that they are the most likely place to find a few cool degrees if the water is deep enough. On the big reservoirs and Highland lochs the cool layer sits at four to ten metres, but late-summer oxygen losses can narrow it. On shallow club fisheries under five metres there is no refuge. Fish dawn and dusk only or rest the venue. Barbless hooks. Land it fast. Wet hands. No air shots. If a fish swims off slowly, rolls, or needs more than half a minute to revive, stop. That is the welfare signal — not the temperature.
- DepthDeep waters: a fast sinker to four to ten metres, but watch the colder deeps for poor oxygen late in the season. Shallow fisheries: no refuge. First light, last light, or come back another day.
- TimingTwo hours after dawn and the hour before dark. Nothing else. The real stop signal is the fish on release — if recovery is slow, stop.
A patient day, if you fancy it
Useful ripple, fishable wave. Take your time — read the water before you cast.
29% confidence — low-confidence read — verify locally
Live now
Conditions on the water
Trends shown where the gauge supports them
Wind
W 23 km/h
Moderate breeze
Wave
40 cm chop
Water temp
—
No reading
Air temp
27°C
Cloud
Clear
Pressure
1015 hPa
Rain · 24h
0.0 mm
No rain
Some readings unavailable — check directly before fishing.
How to fish · for brown trout
The brief
When · where · method · kit
How to fish it · for brown trout
When
The terrestrials are on.
Where
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
Today's tactical plan
The plan
Plan A · Plan B · what to watch · bank or boat
The plan
Plan A
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
Plan B
If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.
Watch for
Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.
Boat — at anchor
Windy conditions suit anchoring in productive areas rather than open-water drifting.
Hatches & runs
What's on, when
Twelve months at a glance
Through the year
0–3 scale · June 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
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Gray DrakeHatch
2
2
Silverhorns & LonghornsHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Today's fly · curated pack
Top pattern + the box
5 patterns from this venue's curated pack
Evidence
Why today scores what it does
The factors driving today's verdict
Why this score
- Wind conditions (windy) are not ideal for this water.
- High temperatures may push fish deeper and reduce surface activity.
- Terrestrials are in their seasonal window, boosting the chance of targeted feeding.
About this water · Lough note · 4 min read
Lewiston Lake · profile
Who this water suits
Strengths · watch-outs · best for
About this water
Lewiston Lake, on the water
Field guide · contributor-editedLewiston Lake · about
What this water is
Background · character · contributors
About this water
A small, cold afterbay below Trinity Dam, kept frigid year-round by the deep, dark water it draws off the bottom of Trinity Lake — which is exactly why the trout grow so well in it. It's a no-motor (or trolling-motor only) pond, best worked from a pram or a tube, and it fishes when the freestones around it are too warm or too high. Midges and Callibaetis are the staples, with leeches and damsels working the drop-offs. Quiet, cold, scenic water with a steady reputation for fat rainbows and the odd big brown.
- Reservoir
- Mixed
Lewiston Lake · directions
How to get to the water
Directions
Lewiston Lake · zones
Where the rules change
Seasons · zones · per-species rules
Seasons & zones
- Trout1 January → 31 December
Lewiston Lake · permits
Good to know
Permits & access
Permit required — see local rules.
- CDFW regulations — verify season and gear rules.
Lewiston Lake
A small, cold afterbay below Trinity Dam, kept frigid year-round by the deep, dark water it draws off the bottom of Trinity Lake — which is exactly why the trout grow so well in it.
Species
Hot — dawn and dusk onlySustained heat. Fish deep, handle carefully, stop if a fish struggles.
The air has been hot long enough for the whole surface to be warm. There is no water sensor here, so we cannot tell you the depths are safe — only that they are the most likely place to find a few cool degrees if the water is deep enough. On the big reservoirs and Highland lochs the cool layer sits at four to ten metres, but late-summer oxygen losses can narrow it. On shallow club fisheries under five metres there is no refuge. Fish dawn and dusk only or rest the venue. Barbless hooks. Land it fast. Wet hands. No air shots. If a fish swims off slowly, rolls, or needs more than half a minute to revive, stop. That is the welfare signal — not the temperature.
- DepthDeep waters: a fast sinker to four to ten metres, but watch the colder deeps for poor oxygen late in the season. Shallow fisheries: no refuge. First light, last light, or come back another day.
- TimingTwo hours after dawn and the hour before dark. Nothing else. The real stop signal is the fish on release — if recovery is slow, stop.
A patient day, if you fancy it
Useful ripple, fishable wave. Take your time — read the water before you cast.
29% confidence — low-confidence read — verify locally
Conditions
Wind
W 23 km/h
Moderate breeze
Wave
40 cm chop
Water temp
—
No reading
Air temp
27°C
Cloud
Clear
Pressure
1015 hPa
Rain · 24h
0.0 mm
No rain
Some readings unavailable — check directly before fishing.
Condition match
41%
Cloud70%
Wind30%
Temp25%
Conditions are away from this venue's sweet spot — it usually fishes best in ripple wind with mixed skies.
How to fish it · for brown trout
When
The terrestrials are on.
Where
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
Plan B
If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.
Watch for
Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.
Boat — at anchor
Windy conditions suit anchoring in productive areas rather than open-water drifting.
Why this score
- Wind conditions (windy) are not ideal for this water.
- High temperatures may push fish deeper and reduce surface activity.
- Terrestrials are in their seasonal window, boosting the chance of targeted feeding.
Through the year
0–3 scale · June 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
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Gray DrakeHatch
2
2
Silverhorns & LonghornsHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Permits & access
Permit required — see local rules.
- CDFW regulations — verify season and gear rules.
Directions
About this water
A small, cold afterbay below Trinity Dam, kept frigid year-round by the deep, dark water it draws off the bottom of Trinity Lake — which is exactly why the trout grow so well in it. It's a no-motor (or trolling-motor only) pond, best worked from a pram or a tube, and it fishes when the freestones around it are too warm or too high. Midges and Callibaetis are the staples, with leeches and damsels working the drop-offs. Quiet, cold, scenic water with a steady reputation for fat rainbows and the odd big brown.
- Reservoir
- Mixed
Seasons & zones
- Trout1 January → 31 December
About this water · Lough note · 4 min read
A small, cold afterbay below Trinity Dam, kept frigid year-round by the deep, dark water it draws off the bottom of Trinity Lake — which is exactly why the trout grow so well in it. It's a no-motor (or trolling-motor only) pond, best worked from a pram or a tube, and it fishes when the freestones around it are too warm or too high. Midges and Callibaetis are the staples, with leeches and damsels working the drop-offs. Quiet, cold, scenic water with a steady reputation for fat rainbows and the odd big brown.
Other water nearby · 3