Mayflies
- Ecology: Good
- Chemical: Unknown
SEPA (Scotland) · UKSC020637
Water temperature for Atlantic Salmon
Warm — slow19°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Water at 18.7°C — above the atlantic salmon caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Mayflies
- Blue-winged oliveMost likely#16–18 · DunDuns are up; a sherry spinner fall may follow.
- Anglers curse mayfliesAlso possibleLower confidence#20–22 · SpinnerGo tiny: 20-22 spent spinner, single fly, long tippet.
- Green drakeAlso possibleLower confidence#8–10 · DunDuns are up — the Spent Gnat spinners fall at dusk.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 5 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Atlantic Salmon fly box
Top
single / small tube · Small Spate River Salmon Fly
River-specific pack, filled from the regional salmon default.
Beats · 3 · 1 reaches
The whole Thurso is managed as one fishery by Thurso River Ltd — 26 miles of double-bank fly fishing divided into 12 beats, each fished by just two rods, so a maximum of 24 anglers a day. Rods rotate through the beats over a week, and most fishing is sold with accommodation through the Ulbster Arms Hotel rather than as casual day rods. It is fly-only, no Sunday fishing, and loch-fed from Loch More, which keeps it fishing when rain-only spate rivers are off. There is no walk-up day-ticket culture here: book the beat package and check the river's terms before travelling.
River Thurso — 12-beat rotation · 3 beatsMixed
Thurso rotating beats (whole river), Lower & middle Thurso beats, Upper Thurso & Loch More
The 3 beats
Thurso rotating beats (whole river)Ballot
Thurso River Ltd / Ulbster Arms Hotel
The river's core product: 26 miles, 12 beats, two rods per beat, rods rotating through the beats over a fishing week. Sold largely as a fly-fishing-plus-accommodation package through the Ulbster Arms Hotel; ghillie support and beat allocation are part of the deal. The rotation is the access unit, not individual day rods.
Fly only. Maximum two rods per beat. No Sunday fishing. Statutory C&R on all salmon before 1 April. A river-specific rule requires release of all fish above 8 lb through the season (verify against the current River Thurso terms before treating as a hard rule). Early-season spring fish are valuable — handle with care.
Lower & middle Thurso beatsBallot
Thurso River Ltd
The lower and middle beats sit closer to the town and estuary and tend to see the first fresh fish; the middle beats are the core rotating-beat fishing. Not separately bookable as day rods — you reach them through the whole-river rotation and the Ulbster Arms package.
Fly only; two rods per beat; no Sunday fishing; statutory C&R before 1 April; 8 lb release rule (verify). Access is via the whole-river beat rotation, not a standalone permit.
Upper Thurso & Loch MoreMembers-only
Thurso River Ltd (verify)
The headwater context that makes the Thurso reliable: the river drains Loch More, whose regulating effect keeps flows steadier than a pure spate river and sustains summer fishing. Upper beats are part of the rotation; the loch itself is a separate trout context rather than a salmon day rod.
Loch More's buffering means rainfall response is delayed and summer flows better held — don't score the Thurso as a simple rain-only spate river. Access via the river rotation; verify any separate loch permit route.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
The River Thurso seen upstream from Thurso Bridge, Caithness, one of Scotland's premier salmon rivers. Terrain map
Water quality (WFD)
The full read · show the working · for Atlantic Salmon · confidence 85%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Directions
Seasons & zones
- Salmon 11 January → 5 October
Related guides
Booking & contacts
Clubs & associations
River Thurso
Water temperature for Atlantic Salmon
Warm — slow19°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Water at 18.7°C — above the atlantic salmon caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Mayflies
- Blue-winged oliveMost likely#16–18 · DunDuns are up; a sherry spinner fall may follow.
- Anglers curse mayfliesAlso possibleLower confidence#20–22 · SpinnerGo tiny: 20-22 spent spinner, single fly, long tippet.
- Green drakeAlso possibleLower confidence#8–10 · DunDuns are up — the Spent Gnat spinners fall at dusk.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 5 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Atlantic Salmon fly box
Top
single / small tube · Small Spate River Salmon Fly
River-specific pack, filled from the regional salmon default.
Beats · 3 · 1 reaches
The whole Thurso is managed as one fishery by Thurso River Ltd — 26 miles of double-bank fly fishing divided into 12 beats, each fished by just two rods, so a maximum of 24 anglers a day. Rods rotate through the beats over a week, and most fishing is sold with accommodation through the Ulbster Arms Hotel rather than as casual day rods. It is fly-only, no Sunday fishing, and loch-fed from Loch More, which keeps it fishing when rain-only spate rivers are off. There is no walk-up day-ticket culture here: book the beat package and check the river's terms before travelling.
River Thurso — 12-beat rotation · 3 beatsMixed
Thurso rotating beats (whole river), Lower & middle Thurso beats, Upper Thurso & Loch More
The 3 beats
Thurso rotating beats (whole river)Ballot
Thurso River Ltd / Ulbster Arms Hotel
The river's core product: 26 miles, 12 beats, two rods per beat, rods rotating through the beats over a fishing week. Sold largely as a fly-fishing-plus-accommodation package through the Ulbster Arms Hotel; ghillie support and beat allocation are part of the deal. The rotation is the access unit, not individual day rods.
Fly only. Maximum two rods per beat. No Sunday fishing. Statutory C&R on all salmon before 1 April. A river-specific rule requires release of all fish above 8 lb through the season (verify against the current River Thurso terms before treating as a hard rule). Early-season spring fish are valuable — handle with care.
Lower & middle Thurso beatsBallot
Thurso River Ltd
The lower and middle beats sit closer to the town and estuary and tend to see the first fresh fish; the middle beats are the core rotating-beat fishing. Not separately bookable as day rods — you reach them through the whole-river rotation and the Ulbster Arms package.
Fly only; two rods per beat; no Sunday fishing; statutory C&R before 1 April; 8 lb release rule (verify). Access is via the whole-river beat rotation, not a standalone permit.
Upper Thurso & Loch MoreMembers-only
Thurso River Ltd (verify)
The headwater context that makes the Thurso reliable: the river drains Loch More, whose regulating effect keeps flows steadier than a pure spate river and sustains summer fishing. Upper beats are part of the rotation; the loch itself is a separate trout context rather than a salmon day rod.
Loch More's buffering means rainfall response is delayed and summer flows better held — don't score the Thurso as a simple rain-only spate river. Access via the river rotation; verify any separate loch permit route.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
The River Thurso seen upstream from Thurso Bridge, Caithness, one of Scotland's premier salmon rivers. Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
SEPA (Scotland) · UKSC020637
The full read · show the working · for Atlantic Salmon · confidence 85%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Directions
Seasons & zones
- Salmon 11 January → 5 October
Related guides
Booking & contacts
Clubs & associations