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2 lakes in Montana

Filter by water quality, level stability, size, and region. Every lake carries a scored profile and, where a gauge exists, live readings.

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Water ABCD What do these grades mean?
Water quality grade
Water A
ExcellentClear, low-nutrient water. Typically oligotrophic with high clarity and little seasonal algae.
Water B
GoodHealthy water with moderate clarity. Some seasonal variation, no persistent problems.
Water C
FairProductive water — good fishing, reduced clarity. Algae possible in late summer.
Water D
PoorNutrient-rich or heavily drawn down. Swimmable conditions vary; check before you rely on them.

Computed from measured clarity, trophic state, and drawdown magnitude — not an opinion. See the formula.

Overall score, 1–10
8.0+
ExceptionalStrong on every axis we measure.
7.0–7.9
StrongClearly above average, usually with one standout axis.
6.0–6.9
SolidA good lake with a trade-off worth understanding.
5.0–5.9
MixedReal strengths and real compromises.
Under 5
CompromisedSomething material — volatility, water quality, or access.

Weighted: water 26% · recreation 22% · investment 20% · value 18% · access 14%.

2 lakes · page 1 of 1
At Flathead Lake in Montana (48539746062).jpg Water A

Flathead Lake

Montana · 126,000 acres
370 ft deep · 30 ft clarity
7.2
Managed 185 mi shore Natural
$1,075,000 median est. +2.9%
Fort Peck Lake (5346035133).jpg Water C

Fort Peck Lake

Montana · 245,000 acres
220 ft deep · 8 ft clarity
5.2
Volatile 1,520 mi shore Reservoir
$740,000 median est. -1.9%

2 results

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All 2 matching lakes plotted. Circle size reflects surface area; color reflects overall score. Click a lake to open its report.