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B

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.

MetricValueGrade
Water Clarity (Secchi Depth)7.5 ftC
Phosphorus23.7 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)49Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth90 ft
Surface Area1,210 acres
Public AccessYes

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.

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedEurasian Water-MilfoilHybrid Eurasian / Northern Water-MilfoilPurple LoosestrifeZebra MusselStarry Stonewort

Water Quality Trend: Stable

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-1.912 m/yr3
Phosphorus Improving-1.13 µg/L/yr3

Recreation & Access

2
Boat Landings
Yes
Public Access

Location

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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

State Parks Near Okauchee Lake Deep Hole Usgs

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1995. 17 stations on file (most recent sample 2025).

DNR Assessment
Reported
Trophic State Index 45 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Musky(Common)Largemouth Bass(Common)Northern Pike(Common)Panfish(Present)Smallmouth Bass(Present)Walleye(Present)

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

Nutrients (phosphorus, nitrogen)

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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