Black Oak Lake
Black Oak Lake in Langlade County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.3 ft visibility. Phosphorus: 29.1 µg/L. Maximum depth: 34 ft. Surface area: 56 acres.
- Clarity
- 4.3 ft
- Max depth
- 34 ft
- Area
- 56 acres
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Langlade County
Why Black Oak Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Black Oak Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. 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.
Black Oak Lake is a 56-acre lake in Langlade County, Wisconsin with a maximum depth of 34 feet. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-07-31. Grade methodology: LakeGrade 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 Black Oak Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.3 ft. Phosphorus level: 29.1 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | Not graded |
| Phosphorus | 29.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Black Oak Lake
Compare lakeside cabins, hotels, and vacation rentals near Black Oak 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 Black Oak Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 34 ft |
| Surface Area | 56 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Long LakePublic
- Black Oak LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Black Oak Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.42 m/yr | 6 |
Graded lakes near Black Oak Lake
Black Oak Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Langlade County
Frequently asked questions about Black Oak Lake
What is the water quality grade for Black Oak Lake?
- Black Oak Lake in Langlade County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.3 ft visibility. Phosphorus: 29.1 µg/L. Maximum depth: 34 ft. Surface area: 56 acres.
Is Black Oak Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Black Oak 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 Black Oak Lake?
- Black Oak Lake has a maximum depth of 34 feet. The lake covers 56 acres.
What fish are in Black Oak Lake?
- Fish species found in Black Oak Lake include Panfish, Largemouth Bass, Northern Pike. Black Oak Lake is located in Langlade County, Wisconsin.
Are there boat ramps on Black Oak Lake?
- Black Oak Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Long Lake, Black Oak Lake. Public access is listed as yes.
Explore Black Oak Lake across LakeGrade
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Where this data comes from
14 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX14 samples · 2021–2022
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory