Mayflies
Chironomids
Gammarids
A well-known Allamakee County creek near Dorchester, just over the line from Minnesota, with wild and stocked browns and rainbows in cold limestone water. A Driftless favourite that fishes hard and rewards persistence.
- Limestone
Rules at a glance
- Fly only
Water temperature for Brown Trout
Ideal13°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 right today, though time of day could be better.
Likely species
Mayflies
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
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
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
Brown Trout fly box
8-12 · Pattern
Proven pattern for this period
Local fly shops: Driftless Fly Fishing Co.
Permits & access
Permit required — see local rules.
- Iowa DNR — verify regulations.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Terrain map
About this water
Water quality · US Clean Water Act
- Aquatic life: Impaired
- Recreation: Impaired
What this classification means
Recreation: Bacteria/pathogen advisory — mind wading cuts and immersion.
EPA ATTAINS assessment unit 'Waterloo Creek' (IA 01-UIA-253), 2024 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Pathogens, Cause Unknown Impaired Biota. 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) · IA 01-UIA-253
The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 84
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 Open all year → Open all year
Related guides
Booking & contacts
Waterloo Creek
A well-known Allamakee County creek near Dorchester, just over the line from Minnesota, with wild and stocked browns and rainbows in cold limestone water.
Water temperature for Brown Trout
Ideal13°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 right today, though time of day could be better.
Likely species
Mayflies
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
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
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
Brown Trout fly box
8-12 · Pattern
Proven pattern for this period
Local fly shops: Driftless Fly Fishing Co.
Permits & access
Permit required — see local rules.
- Iowa DNR — verify regulations.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Terrain map
About this water
A well-known Allamakee County creek near Dorchester, just over the line from Minnesota, with wild and stocked browns and rainbows in cold limestone water. A Driftless favourite that fishes hard and rewards persistence.
- Limestone
Water quality · US Clean Water Act
- Aquatic life: Impaired
- Recreation: Impaired
What this classification means
Recreation: Bacteria/pathogen advisory — mind wading cuts and immersion.
EPA ATTAINS assessment unit 'Waterloo Creek' (IA 01-UIA-253), 2024 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Pathogens, Cause Unknown Impaired Biota. 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) · IA 01-UIA-253
The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 84
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 Open all year → Open all year
Related guides
Booking & contacts