Harper Lake
Harper Lake in Langlade County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. 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 →
- Clarity
- 2.8 ft
- Max depth
- 19 ft
- Area
- 10 acres
- Trend
- ↓ Declining
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Why Harper 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 Harper Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not 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.
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. 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 Harper Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.8 ft of visibility. Phosphorus level: 27.5 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 ft | Not graded |
| Phosphorus | 27.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Harper Lake
Compare lakeside cabins, hotels, and vacation rentals near Harper Lake in Langlade 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 Harper Lake
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Wisconsin DNR lists Panfish as common on Harper 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 Harper Lake — official chemistry is on file, not a letter, 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
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 10 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Harper Lake
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.045 m/yr | 7 |
| Phosphorus | ↓ Declining | +2.5 µg/L/yr | 2 |
Graded lakes near Harper Lake
Harper Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Langlade County
Frequently asked questions about Harper Lake
Where is Harper Lake?
- Harper Lake is a lake in Langlade 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 Harper Lake?
- Harper Lake in Langlade County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. 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?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Harper 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 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 a water-quality grade. LakeQuality does not assign an A–F grade on Harper Lake — official chemistry is on file, not a letter, 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)
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
Fish and recreation data from Wisconsin DNR Lakes