Lily Lake
Lily Lake in Brown County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9.6 ft visibility. Maximum depth: 19 ft. Surface area: 42 acres.
Wisconsin DNR rates Largemouth Bass as abundant on Lily Lake. DNR survey details →
- Clarity
- 9.6 ft
- Typical in August
- 72°F
- Max depth
- 19 ft
- Area
- 42 acres
- Public access
- Yes
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Why Lily 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 Lily Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
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.
Lily Lake is a 42-acre lake in Brown County, Wisconsin with a maximum depth of 19 feet. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-30. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lily Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 9.6 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lily Lake
Compare lakeside cabins, hotels, and vacation rentals near Lily Lake in Brown 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 Lily Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Lily Lake typically sits around 72°F at the surface in August. Summer average is about 76°F. Usually warmest in Jul (about 79°F) and coldest in Apr (about 52°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 8 field readings (2025–2025) via the EPA Water Quality Portal. See the full Lily Lake water temperature breakdown →
Wisconsin DNR rates Largemouth Bass as abundant on Lily Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lily Lake — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1995. 4 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 42 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lily Lake ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lily Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Lily Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Stencil Dairy Farms LlcDenmark · 2.8 mi away · NPDES WI0056731Recent violation
- Belgioioso Cheese Inc DenmarkGlenmore · 4.4 mi away · NPDES WI0051128Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Lily Lake
Lily Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Brown County
Frequently asked questions about Lily Lake
Where is Lily Lake?
- Lily Lake is a lake in Brown County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Lily Lake?
- Lily Lake in Brown County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9.6 ft visibility. Maximum depth: 19 ft. Surface area: 42 acres.
Is Lily Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lily Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Lily Lake?
- Lily Lake typically sits around 72°F at the surface in August, from 8 EPA Water Quality Portal field readings (2025–2025). That is a typical value for the month, not a live reading.
How deep is Lily Lake?
- Lily Lake has a maximum depth of 19 feet. The lake covers 42 acres.
What fish are in Lily Lake?
- Fish species found in Lily Lake include Panfish, Largemouth Bass, Northern Pike. Lily Lake is located in Brown County, Wisconsin.
What did the DNR fisheries survey find at Lily Lake?
- Wisconsin DNR rates Largemouth Bass as abundant on Lily Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lily Lake — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lily Lake?
- Lily Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lily Lake Park. Public access is listed as yes.
Explore Lily Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX4 samples · 2025
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory