Napowan Lake
Napowan Lake in Waushara County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Maximum depth: 18 ft. Surface area: 52 acres.
- Max depth
- 18 ft
- Area
- 52 acres
- Trend
- → Stable
- Public access
- Yes
Next lake in Waushara County
Why Napowan Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Napowan Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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.
Napowan Lake is a 52-acre lake in Waushara County, Wisconsin with a maximum depth of 18 feet. Water clarity is declining over recent sampling years. 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 2026-04-20. Grade methodology: LakeGrade 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 Napowan Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Napowan Lake
Compare lakeside cabins, hotels, and vacation rentals near Napowan Lake in Waushara 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 18 ft |
| Surface Area | 52 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lake NapowanPublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Napowan 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: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.576 m/yr | 7 |
| Phosphorus | ↑ Improving | -2.3 µg/L/yr | 2 |
Graded lakes near Napowan Lake
Napowan Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Waushara County
Frequently asked questions about Napowan Lake
What is the water quality grade for Napowan Lake?
- Napowan Lake in Waushara County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Maximum depth: 18 ft. Surface area: 52 acres.
Is Napowan Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Napowan Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Napowan Lake?
- Napowan Lake has a maximum depth of 18 feet. The lake covers 52 acres.
What fish are in Napowan Lake?
- Fish species found in Napowan Lake include Panfish, Largemouth Bass, Northern Pike. Napowan Lake is located in Waushara County, Wisconsin.
Are there boat ramps on Napowan Lake?
- Napowan Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Napowan. Public access is listed as yes.
Explore Napowan Lake across LakeGrade
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Where this data comes from
4 measurements from 1 monitoring station, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX4 samples · 2025–2026
Analytical methods
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
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
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