John'S Lake
Waushara County, Wisconsin71 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for John'S Lake. Here is what has been measured.
- Zebra Mussel
- 41 ft max depth
- Public access
- Limited data
John'S Lake in Waushara County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 12.5 ft visibility. Maximum depth: 41 ft. Surface area: 71 acres.
Wisconsin DNR lists Panfish as common on John'S Lake. DNR survey details →
John'S Lake is a 71-acre lake in Waushara County, Wisconsin with a maximum depth of 41 feet. Overall water quality is declining over recent sampling years. The lake supports 3 documented fish species including Panfish, Northern Pike, and Trout. Public access is available.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-10. Methodology: how these readings are compared.
What John'S Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12.5 ft of visibility
- Fishing3 species recorded
- Deep water41 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether John'S Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for John'S Lake
These are the measurements Wisconsin DNR publishes for John'S Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 12.5 ft. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 12.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about John'S Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on John'S Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows John'S Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. 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 1986. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
41 ft
Surface area
71 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.4 mi
HydroLAKES / HydroSHEDS
Elevation
866 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
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Stays near John'S Lake
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Follow John'S Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing John'S 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.
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Nearby Lakes in Waushara County
Frequently asked questions about John'S Lake
Where is John'S Lake?
- John'S Lake is a lake in Waushara County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of John'S Lake?
- John'S Lake in Waushara County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 12.5 ft visibility. Maximum depth: 41 ft. Surface area: 71 acres.
Is John'S Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is John'S Lake?
- John'S Lake has a maximum depth of 41 feet. The lake covers 71 acres.
What fish are in John'S Lake?
- Fish species found in John'S Lake include Panfish, Northern Pike, Trout. John'S Lake is located in Waushara County, Wisconsin.
What did the DNR fisheries survey find at John'S Lake?
- Wisconsin DNR lists Panfish as common on John'S Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows John'S Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at John'S Lake?
- Public access to John'S Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
23 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX23 samples · 2020–2026
Analytical methods
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes