Okauchee Lake Deep Hole Usgs
Waukesha County, WisconsinMesotrophic
Okauchee Lake Deep Hole Usgs carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
Mesotrophic conditions dominate at Okauchee Lake Deep Hole Usgs: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. Okauchee Lake Deep Hole Usgs is unusually deep for Wisconsin at 90 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. With 1,210 acres of surface and partial shoreline records, Okauchee Lake Deep Hole Usgs is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Okauchee Lake Deep Hole Usgs ranks 36 of 45 in Waukesha County — at the lower end of the locally monitored distribution.
Okauchee Lake Deep Hole Usgs is on the Wisconsin infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. Public access is available — the lake is on the Wisconsin DNR public-access list. 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 2026-04-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 23.7 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | C |
| Phosphorus | 23.7 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 90 ft |
| Surface Area | 1,210 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
→ Best fishing times for Okauchee Lake Deep Hole Usgs (14-day solunar calendar)
→ Is it safe to eat fish from Okauchee Lake Deep Hole Usgs? (mercury & PFAS guide)
→ Okauchee Lake Deep Hole Usgs 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 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.912 m/yr | 3 |
| Phosphorus | ↑ Improving | -1.13 µg/L/yr | 3 |
Recreation & Access
Location
County Ranking
Ranked #36 of 45 lakes in Waukesha County
Cleaner Lakes Within 30 Miles
Okauchee Lake Deep Hole Usgs holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Waukesha County
More Wisconsin Lake Rankings
State Parks Near Okauchee Lake Deep Hole Usgs
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Compare Okauchee Lake Deep Hole Usgs With Nearby Lakes
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)
EPA Impairment Status
Okauchee Lake Deep Hole Usgs is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10009840 · Official waterbody report · Matched by proximity (0.48 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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2026-04-20
Monitoring stations: 1
Where to stay near Okauchee Lake Deep Hole Usgs
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