Klaus Lake
Klaus Lake in Oconto County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 3 ft visibility. Phosphorus: 92.7 µg/L. Maximum depth: 50 ft. Surface area: 22 acres.
- Clarity
- 3 ft
- Max depth
- 50 ft
- Area
- 22 acres
- Type
- Eutrophic
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Klaus Lake →
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Klaus Lake is a 22-acre productive, nutrient-rich eutrophic lake in Oconto County, Wisconsin with a maximum depth of 50 feet. Water quality is graded D based on 1 sampling years through 2020. Compared to the 38 other monitored lakes in Oconto County, Klaus Lake ranks #39 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-09-14. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 3 ft of visibility. Phosphorus level: 92.7 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 92.7 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Klaus Lake
Compare lakeside cabins, hotels, and vacation rentals near Klaus Lake in Oconto 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Klaus Lake are listed below.
Top-rated places to stay near Klaus Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2020).
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 50 ft |
| Surface Area | 22 acres |
Fishing Klaus Lake
EPA Impairment Status
Klaus 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 WI10009573 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Klaus Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Suring Wastewater Treatment FacilitySuring · 3.9 mi away · NPDES WI0020877Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #39 of 39 lakes in Oconto County
Nearby Lakes With Higher Grades
Klaus Lake holds Grade D. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Oconto County
Frequently asked questions about Klaus Lake
Where is Klaus Lake?
- Klaus Lake is a lake in Oconto County, Wisconsin. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Klaus Lake?
- Klaus Lake in Oconto County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 3 ft visibility. Phosphorus: 92.7 µg/L. Maximum depth: 50 ft. Surface area: 22 acres.
Is Klaus Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Klaus Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
How deep is Klaus Lake?
- Klaus Lake has a maximum depth of 50 feet. The lake covers 22 acres.
Explore Klaus Lake across LakeQuality
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Fish species and best lakes in Oconto County
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
11 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX11 samples · 2020
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes