O'Leary Lake
Grant County, Wisconsin
About O'Leary Lake
O'Leary Lake is a consistent bass fishery tucked into Grant County — the kind of lake that rewards anglers who know it, a intimate 7-acre lake reaching 14 feet at its deepest. Access is limited, which keeps boat traffic low — a plus for solitude seekers. Anglers primarily target Panfish. Note that invasive species (Zebra Mussel) have been documented here — clean your boat before leaving.
Bottom composition: 80% sand, 0% gravel, 0% rock, 20% muck
Type: lake · Hydrology: DRAINED
Lake Location
42.54070° N, 90.63830° W
WBIC 721200 · Wisconsin DNRFish Species
Full table →Fishing Tips
- ·Largemouth bass relate to shallow structure. Work topwater lures at dawn in summer, then switch to soft plastics rigged weedless around lily pads and fallen wood.
- ·Bluegill and crappie stack up in 8–15 ft of water near weedlines. Small jigs tipped with a waxworm are hard to beat.
- ·Panfish are often excellent for kids and beginners — look for them around any dock or submerged brush piles.
Local's Guide
Fishing
Species-specific tips above. Wisconsin fishing license required for ages 16+. See current season regulations below.
View fishing regulations ↓Swimming
O'Leary Lake has limited visibility and a gravel and sand bottom, making it better suited for boating and fishing than swimming. The 7-acre lake offers a quieter, more intimate swimming experience.
Nearby Dining
Local dining recommendations for O'Leary Lake are coming soon. Know a great spot near O'Leary Lake? Share it at staynorthern.com/contact. Looking for restaurants near Grant County lakes? Visit staynorthern.com/eats for our full northwoods dining guide.
Insider Tips
O'Leary Lake is one of Grant County's lesser-known gems — the kind of place locals return to year after year. Early mornings before 9am offer the calmest water and best fishing before boat traffic picks up. If you're visiting for the first time, check the DNR boat landing locations before you arrive — some are well-marked, others take a local to find. Know something about O'Leary Lake that visitors should? Share a tip at staynorthern.com/contact — we add the best ones to this page.
Lake Conditions
Water Clarity
—
No data
Trophic Status
—
No data
Invasive Weeds
Present
Zebra Mussel
Seasonal Notes
See below
Ice-out dates, peak fishing windows
Ice out arrives in late March to early April on southern Wisconsin lakes. Bass and panfish fishing is excellent from early May onward. Swimming season runs from early June through September. Fall color peaks in mid-October. Ice fishing is possible in most winters but season length varies — check conditions before heading out.
Condition data sourced from Wisconsin DNR surveys. Real-time weed and clarity reports coming soon.
Invasive Species Present
Zebra Mussel has been documented in O'Leary Lake. Clean, drain, and dry all watercraft and equipment before leaving.
Report sightings to the Wisconsin DNR invasive species hotline.Frequently Asked Questions
What fish can you catch in O'Leary Lake?
O'Leary Lake is home to Largemouth Bass, and Panfish (Common). Wisconsin fishing regulations apply — check current seasons and size limits before heading out.
Can you boat on O'Leary Lake?
O'Leary Lake does not currently have a public boat landing listed in the Wisconsin DNR database. Shore fishing or kayak/canoe access may still be available — check local access points.
How big is O'Leary Lake?
O'Leary Lake has 7 acres in surface area, a maximum depth of 14 feet.
What is the bottom of O'Leary Lake like?
The lake bottom is composed of 80% sand, 0% gravel, 0% rock, 20% muck. Sandy and gravel bottoms typically support good swimming and healthy fish habitat.
Are there invasive species in O'Leary Lake?
Yes — Zebra Mussel has been documented in O'Leary Lake. Please clean, drain, and dry your watercraft and all equipment before leaving any Wisconsin water body to prevent the spread of invasive species.
Where is O'Leary Lake located?
O'Leary Lake is located in Grant County, Wisconsin. GPS coordinates: 42.5407° N, 90.6383° W.
Are there vacation rentals on O'Leary Lake?
Stay Northern is building the most complete rental directory for Grant County lakes. Check our O'Leary Lake vacation rentals listing — if none are available yet, check back soon or browse nearby Grant County lake rentals.
Fishing Regulations
Current season regulations for O'Leary Lake
Regulation data is not available for this lake. Check with the Wisconsin DNR for current season rules before fishing.
Regulations sourced from Wisconsin DNR fisheries data. Always verify current regulations before fishing.
Lake Details
- WBIC
- 721200
- County
- Grant County
- Surface Area
- 7 acres
- Max Depth
- 14 ft
- Bottom
- 80% sand, 0% gravel, 0% rock, 20% muck
- Lake Type
- lake
- Coordinates
- 42.5407, -90.6383
Boat Rentals Nearby
Pontoon
Listing soonFishing Boat + Motor
Listing soonKayak / Canoe
Listing soonKnow a local boat rental operator near O'Leary Lake? Let us know.
Lake data sourced from the Wisconsin DNR. Last updated 4/30/2026.