Deep Hole Lake
Langlade County, WisconsinLimited DataEutrophic
Deep Hole Lake earns a D — measurements through 2026 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.
Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. At only 10 ft deep, Deep Hole Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. At 8 acres, Deep Hole Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Within the 33 graded lakes of Langlade County, Deep Hole Lake sits at rank 26, near the bottom of the county list.
An invasive species record — Rusty Crayfish — has been logged at Deep Hole Lake; Wisconsin DNR maintains the official infested-waters list. 1 fish species are documented at Deep Hole Lake, a mixed warm-water community typical for Wisconsin lakes of this size. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-08. 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 4 ft. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10 ft |
| Surface Area | 8 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)
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 | ↑ Improving | +0.348 m/yr | 7 |
| Phosphorus | ↓ Declining | +1.79 µg/L/yr | 7 |
Location
County Ranking
Ranked #26 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 (2.34 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: 2026-06-08
Monitoring stations: 1
Where to stay near Deep Hole Lake
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