Quarry Lake
Quarry Lake in Brown County, Wisconsin has a water quality grade of B (Good). Water clarity: 8 ft visibility. Phosphorus: 34 µg/L. Chlorophyll-a (algae): 9.6 µg/L.
- Clarity
- 8 ft
- Typical in August
- 71°F
- Type
- Eutrophic
- Trend
- ↑ Improving
Next lake in Brown County
Quarry Lake is a productive, nutrient-rich eutrophic lake in Brown County, Wisconsin. Water quality is graded B based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 1 other monitored lakes in Brown County, Quarry Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Moderate clarity, visible to about 8 ft. Phosphorus level: 34 µg/L. Chlorophyll-a: 9.6 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | 34 µg/L | Good |
| Chlorophyll-a (Algae) | 9.6 µg/L | Good |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Quarry Lake
Compare lakeside cabins, hotels, and vacation rentals near Quarry 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 Quarry Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Quarry Lake typically sits around 71°F at the surface in August. Summer average is about 73°F. Usually warmest in Jul (about 76°F) and coldest in Apr (about 55°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 48 field readings (2024–2025) via the EPA Water Quality Portal. See the full Quarry Lake water temperature breakdown →
Fishing Quarry Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +2 m/yr | 2 |
| Phosphorus | → Stable | +0.26 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -3.48 µg/L/yr | 6 |
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Quarry Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Oneida WwtfOneida · 1.7 mi away · NPDES WI0071323Recent violation
- Village Of Hobart Small MS4Hobart · 1.5 mi away · NPDES WI0073024
- Oneida Tribe Of IndiansOneida · 1.7 mi away · NPDES WI0073032
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.
County Ranking
Ranked #1 of 2 lakes in Brown County
Nearby Lakes With Higher Grades
Quarry Lake holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Brown County
Frequently asked questions about Quarry Lake
What is the water quality grade for Quarry Lake?
- Quarry Lake in Brown County, Wisconsin has a water quality grade of B (Good). Water clarity: 8 ft visibility. Phosphorus: 34 µg/L. Chlorophyll-a (algae): 9.6 µg/L.
Is Quarry Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Quarry Lake has a water quality grade of B (Good). Algae concentration (chlorophyll-a) is 9.6 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Quarry Lake?
- Quarry Lake typically sits around 71°F at the surface in August, from 48 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
65 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Oneida Nation
ONEIDA_WQX65 samples · 2020–2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
- 4500 P E ~ Phosphorus by Ascorbic Acid
- UNKNOWN
- 10200 H ~ Chlorophyll a-b-c Determination
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)