Deep Hole Lake
Langlade County, WisconsinLimited DataEutrophic
Deep Hole Lake earns a D — measurements through 2025 show persistent nutrient pressure that limits clarity through the summer. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
At a TSI of 54, Deep Hole Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Deep Hole Lake is a shallow lake at 10 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. At 18 acres, Deep Hole Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Deep Hole Lake ranks 29 of 33 in Langlade County — at the lower end of the locally monitored distribution.
No invasive species are currently listed at Deep Hole Lake — the lake remains off the Wisconsin infested-waters roster. The lake's fish records list 1 species — a varied community without one dominant gamefish. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-06-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10 ft |
| Surface Area | 18 acres |
Fish Species
Click a species to see every graded lake where it is documented.
→ Best fishing times for Deep Hole Lake (14-day solunar calendar)
→ Is it safe to eat fish from Deep Hole Lake? (mercury & PFAS guide)
→ Deep Hole Lake fishing regulations (limits, seasons, special rules)
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.018 m/yr | 7 |
Location
County Ranking
Ranked #29 of 33 lakes in Langlade County
Cleaner Lakes Within 30 Miles
Deep Hole Lake holds Grade D. 3 nearby lakes hold higher grades.
Nearby Lakes in Langlade County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2015. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
EPA Impairment Status
Deep Hole Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10007039 · Official waterbody report · Matched by proximity (1.18 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Most recent sample: 2025-06-21
Monitoring stations: 1
Where to stay near Deep Hole Lake
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