Okauchee Lake Site
Waukesha County, Wisconsin1,210 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Okauchee Lake Site. Here is what has been measured.
- Mesotrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- 3 aquatic invasives
- 90 ft max depth
- Public access
Okauchee Lake Site in Waukesha County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 4.6 ft visibility. Phosphorus: 16.2 µg/L. Maximum depth: 90 ft. Surface area: 1210 acres.
Wisconsin DNR lists Musky as common on Okauchee Lake Site. DNR survey details →
Okauchee Lake Site is a 1,210-acre mesotrophic lake in Waukesha County, Wisconsin with a maximum depth of 90 feet. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available. Compared to the 34 other monitored lakes in Waukesha County, Okauchee Lake Site ranks #34 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-08-28. Methodology: how these readings are compared.
Okauchee Lake Site covers about 1,200 acres in Waukesha County. For a place on the water, look through cabin and lake-house rentals near Okauchee Lake Site on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Okauchee Lake Site is good for
From access and monitoring records, not editorial picks.
- Fishing6 species recorded
- Deep water90 ft surveyed max depth
- Big water1,210 acres
Swimming conditions
Readings onlyRecreation use not supported
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Okauchee Lake Site is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Okauchee Lake Site is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Okauchee Lake Site
These are the measurements Wisconsin DNR publishes for Okauchee Lake Site, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.6 ft. Phosphorus 16.2 µg/L. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 16.2µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 50 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Okauchee Lake Site
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Musky as common on Okauchee Lake Site.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Okauchee Lake Site’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1995. 17 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
90 ft
Surface area
1,210 acres
Public access
Yes
Listed by Wisconsin DNR
Stays via Stay22
Stays near Okauchee Lake Site
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Fish Species
Click a species to see every lake where it is documented.
Fishing Okauchee Lake Site
- → Okauchee Lake Site fishing: DNR survey catch rates, species & stocking
- → Okauchee Lake Site fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Okauchee Lake Site fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Okauchee Lake Site? (mercury & PFAS guide)
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: Improving
Based on 7 years of monitoring (2020–2026).
Water clarity
Improving7 years
Phosphorus
Stable-0.09 µg/L/yr7 years
Chlorophyll-a
Improving-0.4 µg/L/yr2 years
EPA Impairment Status
Okauchee Lake Site is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
Source: EPA ATTAINS assessment unit WI10009840 · Official waterbody report
Nearby Lakes in Waukesha County
Frequently asked questions about Okauchee Lake Site
Where is Okauchee Lake Site?
- Okauchee Lake Site is a lake in Waukesha County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Okauchee Lake Site?
- Okauchee Lake Site in Waukesha County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 4.6 ft visibility. Phosphorus: 16.2 µg/L. Maximum depth: 90 ft. Surface area: 1210 acres.
Is Okauchee Lake Site safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Okauchee Lake Site is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Okauchee Lake Site?
- Okauchee Lake Site has a maximum depth of 90 feet. The lake covers 1210 acres.
What fish are in Okauchee Lake Site?
- Fish species found in Okauchee Lake Site include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Okauchee Lake Site is located in Waukesha County, Wisconsin.
What did the DNR fisheries survey find at Okauchee Lake Site?
- Wisconsin DNR lists Musky as common on Okauchee Lake Site. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Okauchee Lake Site’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Okauchee Lake Site?
- Public access to Okauchee Lake Site is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Okauchee Lake Site across LakeQuality
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Where this data comes from
19 measurements from 2 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX19 samples · 2020–2024
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Fish and recreation data from Wisconsin DNR Lakes