Harper Lake
Langlade County, Wisconsin10 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Harper Lake. Here is what has been measured.
- 19 ft max depth
- Limited data
Harper Lake in Langlade County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 2.8 ft visibility. Phosphorus: 27.5 µg/L. Maximum depth: 19 ft. Surface area: 10 acres.
Wisconsin DNR lists Panfish as common on Harper Lake. DNR survey details →
Harper Lake is a 10-acre lake in Langlade County, Wisconsin with a maximum depth of 19 feet. Overall water quality is declining over recent sampling years. The lake supports 2 documented fish species including Panfish and Largemouth Bass.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-08-22. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Harper 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 Harper Lake
These are the measurements Wisconsin DNR publishes for Harper Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.8 ft of visibility. Phosphorus 27.5 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27.5µg/L | Measured, not scored 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. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Harper Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on Harper Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Harper Lake’s water-quality measurements separately, and the water-quality trend over 7 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. 1 station on file (most recent sample 2024).
Fish Species (DNR-rated)
Lake Details
Max depth
19 ft
Surface area
10 acres
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Fish Species
Click a species to see every lake where it is documented.
Fishing Harper Lake
Water Quality Trend: Worsening
Based on 7 years of monitoring (2020–2026).
Water clarity
Stable7 years
Phosphorus
Worsening+2.5 µg/L/yr2 years
Nearby Lakes in Langlade County
Frequently asked questions about Harper Lake
Where is Harper Lake?
- Harper Lake is a lake in Langlade County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Harper Lake?
- Harper Lake in Langlade County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 2.8 ft visibility. Phosphorus: 27.5 µg/L. Maximum depth: 19 ft. Surface area: 10 acres.
Is Harper Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Harper Lake?
- Harper Lake has a maximum depth of 19 feet. The lake covers 10 acres.
What fish are in Harper Lake?
- Fish species found in Harper Lake include Panfish, Largemouth Bass. Harper Lake is located in Langlade County, Wisconsin.
What did the DNR fisheries survey find at Harper Lake?
- Wisconsin DNR lists Panfish as common on Harper Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Harper Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
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Where this data comes from
2 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX2 samples · 2024
Analytical methods
- Phosphorus by Colorimetry
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
Fish and recreation data from Wisconsin DNR Lakes