Mayflies
Chironomids
Gammarids
Official Wild Trout water in the upper Mokelumne system: a Sierra freestone counterpart to the lower Mokelumne tailwater. Expect pocket water, smaller wild trout, runoff timing and access-specific planning rather than boat-tailwater tactics.
- Mixed
Rules at a glance
- Fly only
Water temperature for Brown Trout
Cool — slow9°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown 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 working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Hatch timeline · tomorrowPeak at 9pm
12pm(now) — Western Blue-Winged Olive
Stage: On emergersApproach: Emerger or dryActivity: 32%
Also:Black Midge26%
Peak emergence windowWeather boost5 food groups active
Peak activity at 9pm — Brown Dun (Brown Dun, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Supporters see what else is on the menu.
Start free trial14-day free trial. Cancel anytime.
Evidence
Records-basedModerate confidence
Based on species-occurrence records, not local invertebrate surveys.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
1
Brown DunHatch
2
3
3
3
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
- CDFW Wild Trout designation; verify reach boundaries and current rules.
What's coming
Plan ahead
5-day outlook
Other water nearby · 4
Gallery · 2
Terrain map
About this water
Water quality · US Clean Water Act
- Aquatic life: Supporting
What this classification means
EPA ATTAINS assessment unit 'Mokelumne River, North Fork' (CAR5326001420041208150818), 2024 Integrated Report. Aquatic Life use: Fully Supporting. 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) · CAR5326001420041208150818
The full read · show the working · for Brown Trout · confidence 75%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity69 × 12%8.3
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
Seasons & zones
- Trout Last Saturday in April → 15 November
Related guides
Booking & contacts
North Fork Mokelumne River
Official Wild Trout water in the upper Mokelumne system: a Sierra freestone counterpart to the lower Mokelumne tailwater.
Water temperature for Brown Trout
Cool — slow9°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown 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 working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Hatch timeline · tomorrowPeak at 9pm
12pm(now) — Western Blue-Winged Olive
Stage: On emergersApproach: Emerger or dryActivity: 32%
Also:Black Midge26%
Peak emergence windowWeather boost5 food groups active
Peak activity at 9pm — Brown Dun (Brown Dun, Weather boost)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Supporters see what else is on the menu.
Start free trial14-day free trial. Cancel anytime.
Evidence
Records-basedModerate confidence
Based on species-occurrence records, not local invertebrate surveys.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
1
Brown DunHatch
2
3
3
3
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
- CDFW Wild Trout designation; verify reach boundaries and current rules.
What's coming
Plan ahead
5-day outlook
Other water nearby · 4
Gallery · 2
Terrain map
About this water
Official Wild Trout water in the upper Mokelumne system: a Sierra freestone counterpart to the lower Mokelumne tailwater. Expect pocket water, smaller wild trout, runoff timing and access-specific planning rather than boat-tailwater tactics.
- Mixed
Water quality · US Clean Water Act
- Aquatic life: Supporting
What this classification means
EPA ATTAINS assessment unit 'Mokelumne River, North Fork' (CAR5326001420041208150818), 2024 Integrated Report. Aquatic Life use: Fully Supporting. 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) · CAR5326001420041208150818
The full read · show the working · for Brown Trout · confidence 75%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity69 × 12%8.3
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
Seasons & zones
- Trout Last Saturday in April → 15 November
Related guides
Booking & contacts