Deep Hole Lake
Deep Hole Lake in Langlade County, Wisconsin has a water quality grade of C (Fair). Water clarity: 9 ft visibility. Phosphorus: 37.7 µg/L.
- Clarity
- 9 ft
- Type
- Eutrophic
- Trend
- ↓ Declining
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Deep Hole Lake is a productive, nutrient-rich eutrophic lake in Langlade County, Wisconsin. Water quality is graded C based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. Compared to the 10 other monitored lakes in Langlade County, Deep Hole Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-08. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 9 ft. Phosphorus level: 37.7 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | Not graded |
| Phosphorus | 37.7 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Deep Hole Lake
Compare lakeside cabins, hotels, and vacation rentals near Deep Hole 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 Deep Hole Lake
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Fishing Deep Hole Lake
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.018 m/yr | 7 |
| Phosphorus | ↓ Declining | +1.79 µg/L/yr | 7 |
County Ranking
Ranked #9 of 11 lakes in Langlade County
Nearby Lakes With Higher Grades
Deep Hole Lake holds Grade C. 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 Langlade County
Frequently asked questions about Deep Hole Lake
Where is Deep Hole Lake?
- Deep Hole Lake is a lake in Langlade County, Wisconsin. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Deep Hole Lake?
- Deep Hole Lake in Langlade County, Wisconsin has a water quality grade of C (Fair). Water clarity: 9 ft visibility. Phosphorus: 37.7 µg/L.
Is Deep Hole Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Deep Hole Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Explore Deep Hole Lake across LakeQuality
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Where this data comes from
83 measurements from 3 monitoring stations, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX83 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (3)
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)