Spring Creek · Limestone · Minnesota

Garvin Brook

Garvin Brook venue image
Poor · Rainbow Trout
Pink Squirrel · 14-16
Poorlive now
Not the day for it
River dropping into shape after a lift. Not much stacked in your favour today. Worth an hour if you are nearby, not worth the special trip.
90% confidence
What moved it
  • LevelModerate rain recentlyNo gauge reading
  • Water temp22.2°C
  • ClaritySlightly coloured
Today's fly
Pink Squirrel
Pink Squirrel14-16
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Moderate rain recently
No gauge reading
Water temp22.2°C
ClaritySlightly coloured
Weather28°C
WindS 9 km/h
Pressure1013 hPa
Rain · recent15.3 mm
Rain · ahead15.2 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Rainbow Trout
Warm — slow
22°C est.ideal 10–18°C
0°14°28°
How to fish it · for Rainbow 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
Water at 22.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 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
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
Rainbow Trout fly box
SU
Sulphur
16-18 · Pattern
Proven pattern for this period
Local fly shops: Driftless Fly Fishing Co.
Permits & access
Permit required — see local rules.
  • MN DNR — verify season dates and regulations.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
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 'Garvin Brook' (MN07040003-542), 2024 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Turbidity, Pathogens. 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) · MN07040003-542

The full read · show the working · for Rainbow Trout · confidence 90%
How the 15 is built — score × weight = contribution
Temperature9 × 28%2.5
Flow95 × 22%20.9
Clarity90 × 18%16.2
Feeding Time50 × 13%6.5
Pressure75 × 7%5.3
Insect activity48 × 12%5.8
Limiting factor: Water temperature (22.2°C) is outside Rainbow Trout's preferred range (10–18°C)= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • TroutJanuary 1 (winter catch-and-release) → September 30 (harvest from mid-April)
Related guides
Euro Nymphingsubsurface methods
Booking & contacts