1
ALacey Keosauqua Lake
Van Buren County, Iowa · 25 mi from Lake Fisher
- +Two grade letters higher (F → A)
- ++5.1 ft water clarity
- +Lower phosphorus (21.5 vs 85 µg/L)
Cleaner Lakes Than Lake Fisher
2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lake Fisher carries a Grade F (Algae-prone) water quality score. Within 30 miles, 2 lakes hold a higher grade. Lacey Keosauqua Lake (Van Buren County, Grade A, 25 mi away) is the closest meaningful upgrade.
Reviewed by LakeQuality Editorial Team · Updated
2
CRathbun Lake
Appanoose County, Iowa · 24 mi from Lake Fisher
- +Two grade letters higher (F → C)
- +Lower phosphorus (48 vs 85 µg/L)
Reading the cohort
Only 2 lakes within a 30-mile radius score better than Lake Fisher's Grade F. The narrow set of options reflects either a fairly clean lake to begin with or a region without a wide range of cleaner alternatives — the trip-planning decision is more constrained than the headline "cleaner lakes nearby" suggests.
The nearest cleaner alternative — Lacey Keosauqua Lake in Van Buren County — sits 25 miles from Lake Fisher, putting it firmly in "destination trip" rather than "neighborhood swap" range. The water-quality gap has to be the deciding factor; for a casual outing, Lake Fisher is the practical choice and the cleaner options are reserved for purpose-specific visits.
Lakes are graded A to F on nutrients and algae — total phosphorus, total nitrogen, chlorophyll-a, and turbidity — measured against the EPA National Lakes Assessment 2022 condition classes for that lake's own ecoregion, so a lake is judged against the lakes it would naturally resemble. A higher letter reflects measurably lower nutrient and algae levels, not subjective beauty or access quality — a Grade A lake might have worse boat-launch facilities or shoreline access than a Grade C neighbor, so the ranking is one input alongside the rest of trip planning. The full grading formula is on our methodology page.
How this list is built
Rated lakes on LakeQuality have a letter from EPA Water Quality Portal samples — nutrients and algae measured against EPA National Lakes Assessment ecoregion classes. Secchi is shown, not scored. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.