Oconomowoc Lake (Waukesha County)

Waterbody ID (WBIC): 849600 — permanent page /lakes/849600/.

Oconomowoc Lake is in Waukesha County; records show 818 acres and DNR fish-frequency records.

Size

818 acres

Lake type

DRAINAGE

Max depth

60 ft

Mean depth

32 ft

• 5 fish species/groups with abundance categories (DNR lake page)
• Fish stocking documented through 2024 (DNR stocking records)
• Summer Secchi clarity median 12 ft (field measurements)
• Official DNR depth map available (PDF)

Back to results Show on map Depth map (PDF) Check current DNR regulations

Plan your visit

• Lake directory: public landing — No
• Lake directory: public beach — No
• Lake directory: public park — No

Each statement is bounded to its named source; absence of a record is never evidence of no access. The DNR access database may lag reality; posted signs at the landing are authoritative.

Verify at the DNR public boat access program page.

Fishing

The DNR lake page publishes 5 fish species/groups with abundance categories — categories are source labels, never a population count.

DNR fish labels: Largemouth Bass—Common; Northern Pike—Common; Panfish—Present; not population counts.

Stocking records: 25 documented events through 2024, 708,380 fish total. Species: Walleye (Frequent), Northern Pike (Historic). Events in 2015 or later count as recent.

No fisheries survey population estimate is published for this lake in the covered report families.

• Musky reproductive status (DNR mapped): Reproduction UNK, stocking occurs (Cat. 0)

Fishing limits — 2026-2027 season: 17 normalized rows across 17 species entries. Normalized from the DNR ruleset retrieved 2026-08-04. Source text remains authoritative.

2026-2027 retained fishing rules: 17 published rows for 17 species; effective through 2027-03-07. Check current DNR rules.

Water and setting

• Field-measured summer Secchi clarity: median 12 ft from 97 samples, latest sample 2025-08-25
• Satellite clarity estimate: 9.53 ft (2017) — a remote-sensing estimate, kept separate from field measurements
• Lake directory clarity class: Very Clear

Official DNR depth map (PDF) — Historical lake map; not for navigation. Link checked 2026-07-16.

• AIS record: Eurasian watermilfoil — Verified (vouchered), latest documented 2007-09-06
• AIS record: Hybrid Eurasian / northern watermilfoil — Verified (vouchered), latest documented 1994-05-01
• AIS record: Zebra mussel — Verified, latest documented 1999-01-01

Occurrence records come from a non-exhaustive DNR inventory; a record documents presence at observation time and a missing record is never evidence of absence.

• Public-land proximity (GIS proxy, not access evidence): none mapped within 1,000 ft; nearest: Statewide Public Access (Wisconsin DNR); ≈0% of shoreline buffer
• Shoreline development (landcover proxy, 2025 source): ≈50.3% developed land within 300 m, ≈11.4% impervious
• Road proximity (TIGER proxy, 2025 source): nearest local road or city street ≈0 m; ≈7.7 km of road per km² within 1 km

• Priority Navigable Waterway — basis: musky area

Designations are legally defined DNR records shown as their sources state them; no composite rating is implied.

Data & sources

Published data families

• Fish species and abundance (DNR lake pages)
• Fish stocking history
• Fishing regulations (normalized snapshot)
• Directory access facts (landing, beach, park)
• Satellite water clarity estimate
• Field-measured Secchi clarity
• Aquatic invasive species occurrences

Original records: Wisconsin DNR lake page.

Missing values are unpublished, never zero; each fact above is bounded to its named source and date. Full sourcing detail: Data & methods.