Lilly Lake
Lilly Lake in Marathon County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 82 acres.
- Area
- 82 acres
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Why Lilly Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lilly Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lilly Lake is a 82-acre lake in Marathon County, Wisconsin.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lilly Lake water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lilly Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Lilly Lake
Compare lakeside cabins, hotels, and vacation rentals near Lilly Lake in Marathon County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lilly Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 82 acres |
No bathymetric survey has been published for Lilly Lake, so its depth is not documented here.
Fishing Lilly Lake
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Frequently asked questions about Lilly Lake
Where is Lilly Lake?
- Lilly Lake is a lake in Marathon County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lilly Lake?
- Lilly Lake in Marathon County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 82 acres.
Is Lilly Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lilly Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Lilly Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.