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LakeQuality
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Little Sand Lake

Forest County, WisconsinOligotrophic

On the LakeGrade rubric, Little Sand Lake pulls an A: clarity at 26.2 ft and 16 µg/L of phosphorus put it in the top bracket for Wisconsin. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake bottoms out at 20 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 237 acres, Little Sand Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Little Sand Lake ranks 5 of 35 in Forest County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Little Sand Lake — the lake remains off the Wisconsin infested-waters roster. Walleye are documented at Little Sand Lake, one of 4 fish species on record for the lake. A documented public access point at Little Sand Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-09-21. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 26.2 ft down. Phosphorus level: 15.9 µg/L. Trophic State Index: 37.

MetricValueGrade
Water Clarity (Secchi Depth)26.2 ftA
Phosphorus15.9 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)37Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth20 ft
Surface Area237 acres
Public AccessYes

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Little Sand Lake (14-day solunar calendar)

→ Is it safe to eat fish from Little Sand Lake? (mercury & PFAS guide)

Little Sand Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Declining

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Phosphorus Declining+1.5 µg/L/yr2
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #5 of 35 lakes in Forest County

Nearby Lakes in Forest County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).

Fish Species (DNR-rated)

Panfish(Common)Largemouth Bass(Present)Northern Pike(Present)Walleye(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2022-09-21

Monitoring stations: 1