Lake Koshkonong · Fort Atkinson, Wisconsin
Your private sand beach on Southern Wisconsin's largest lake
The rarest shoreline on the lake
Nearly every lakefront lot on Lake Koshkonong meets the water with a boulders-only shoreline or a bluff with several flights of stairs. This one doesn’t. Here, a level lawn rolls straight into 130 feet of private sand beach - a walk-in swimming beach with a sand bottom that stays gentle past the end of the pier.
Kids wade in without a ladder. Grandparents walk to the pontoon without a single stair. The beach chairs sit on pristine beach. Swim, boat, jet ski, fish, ski, and tube by day. Relax in the hot tub or with a camp fire by night.
Walk-in sand beach
Easy access, kid friendly, and ready for dawn-to-dusk lake activities
Custom brick, 4,100 sq ft
4 bedrooms, 4 full baths, hot tub, granite & stainless kitchen, heated 2-car garage.
Turnkey lake fun
Pier and boat lift included. Pontoon boat, jet skis, and the water-toy fleet available.
Gallery
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Property details
The residence
| Living area | 4,100 sq ft — all above grade |
| Bedrooms | 4 |
| Bathrooms | 4 full |
| Built | 2001, custom brick construction |
| Kitchen | Granite counters, large stainless range & oven, stainless appliances |
| Screened porch | Hot tub, conveys with the sale |
| Attached garage | 2-car, heated |
| Driveway | Concrete |
The waterfront
| Frontage | 130 ft on Lake Koshkonong |
| Shoreline | 100% private sand beach, sand bottom |
| Included | Pier & boat lift |
| Water at pier | ~3 ft - ideal for pontoon boat & jet skis |
| Exposure | East — sunrise over the water, shaded deck evenings |
Land & outbuildings
| Lot | 1.28 acres across two parcels, conveying together |
| Detached garage | 25 × 40 ft (1,000 sq ft) - shop, storage, toys |
| Irrigation | Lawn irrigation system |
Taxes & district
| Property taxes (2025) | $10,146 |
| Schools | School District of Fort Atkinson |
| County | Jefferson County — Town of Sumner |
| Lake district | Rock-Koshkonong Lake District |
Southern Wisconsin’s largest lake
Ten thousand acres of big, open water forty minutes from Madison’s doorstep. Lake Koshkonong is one of Wisconsin’s largest inland lakes - a broad, warm lake fed by the Rock River. It's famous for pontoon afternoons, sandbar summers, and some of the best fishing in southern Wisconsin.
Shallow and sun-warmed, Lake Koshkonong turns swimmable weeks before the deep glacial lakes do — and its sand-bottom shallows are exactly what pontoon-and-beach summers are made of. Anglers work the same water for walleye, crappie, white bass, and channel cats. Hunters know the marshes as a legendary waterfowl flyway. Winter brings ice fishing villages and snowmobile trails straight off the shore.
Buyer’s agents welcome
This home is offered for sale by owner. The sellers welcome representation and are offering buyer-agent compensation of 2.5%, confirmed in a written compensation agreement with each offer.
Schedule a private showing
Private showings by appointment. We ask for a mortgage pre-approval letter or proof of funds before confirming a showing.