What is the cleanest lake near Upper Turtle Lake?

Echo Lake in Barron County holds a Grade B water quality score and is null miles from Upper Turtle Lake.

Why is Upper Turtle Lake not Grade A?

Upper Turtle Lake holds Grade C, with about 4 ft of water clarity and 38.2 µg/L of phosphorus. The letter is nutrients and algae against that lake’s EPA ecoregion classes. Clarity is shown separately. Cleaner alternatives nearby have a strictly higher nutrient-and-algae score.

Are these recommendations based on real data?

Yes. Every grade is calculated from EPA Water Quality Portal samples for the lake. Recommendations are limited to lakes within 30 miles of Upper Turtle Lake in Wisconsin, with strictly higher numeric grade scores and sufficient monitoring data.

Cleaner Lakes Than Upper Turtle Lake, Top 3 Within 30 Miles

Cleaner Lakes Than Upper Turtle Lake

3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.

Upper Turtle Lake carries a Grade C (Fair) water quality score. Within 30 miles, 3 lakes hold a higher grade. Echo Lake (Barron County, Grade B, null mi away) is the closest meaningful upgrade.

Echo Lake

Barron County, Wisconsin · mi from Upper Turtle Lake

+Higher grade (C → B)
++9 ft water clarity
+Lower phosphorus (14.8 vs 38.2 µg/L)

Horseshoe Lake

Polk County, Wisconsin · mi from Upper Turtle Lake

+Higher grade (C → B)
++4.5 ft water clarity
+Lower phosphorus (22.1 vs 38.2 µg/L)

Big Moon Lake at

Barron County, Wisconsin · mi from Upper Turtle Lake

+Higher grade (C → B)
++6 ft water clarity
+Lower phosphorus (23.3 vs 38.2 µg/L)

Reading the cohort

Only 3 lakes within a 30-mile radius score better than Upper Turtle Lake's Grade C. 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 closest cleaner alternative — Echo Lake in Barron County, Grade B — sits miles from Upper Turtle Lake. At that distance, the substitution cost is essentially zero: same drive time, same regional access, demonstrably cleaner water on the EPA indicators. For repeat visitors who care about clarity or phosphorus levels, swapping the routine to Echo Lake is mostly a habit change rather than a logistics change.

The EPA water-quality grading combines clarity (Secchi depth), phosphorus, and chlorophyll-a measurements from state environmental sampling. A higher letter grade reflects measurably cleaner water on those indicators, 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. See the methodology page for the full grading formula.

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.