The lake reaches a maximum depth of approximately 13 feet, fed by deep underground springs that maintain cool water temperatures.
The surrounding landscape was shaped by the Green Bay Lobe of the Wisconsin Glaciation, creating the characteristic 'kettle and moraine' topography.
The property is connected to the wider Kettle Moraine trail system, which spans over 22,000 acres of protected state forest.
The nature center on-site functions as a research and education hub for local driftless area flora and fauna.
The lake is managed specifically for small-craft recreation, prohibiting high-speed gas-powered boat motors.
The Ottawa Lake Recreation Area is a primary hub within the Kettle Moraine State Forest—Southern Unit, centered around a 17-acre spring-fed lake. The site provides 100 developed campsites equipped with electrical hookups, vault toilets, and showers. A designated swimming beach is situated on the lake's north shore, featuring an adjacent bathhouse. The recreation area serves as a terminus for several hiking trails, including access to the Ice Age National Scenic Trail. Visitors can utilize a concrete boat launch for non-motorized and electric-motor watercraft. Fishing opportunities include populations of largemouth bass, northern pike, and panfish. The site hosts an interpretive nature center that details the geological history of the surrounding glacial moraines. Picnic areas are dispersed near the shoreline with available grills and tables.
The elevated boardwalk and observation platform near the nature center overlooking the lake.
Reserve campsites well in advance, as sites are fully booked months ahead of time during peak summer weekends.
Bring insect repellent, as the humid, forested environment near the lake attracts significant mosquito activity in mid-summer.
Verify current trail conditions on the official state website before arrival, as heavy rains can cause seasonal closures of lower forest segments.
Assuming watercraft rentals are available on-site; visitors must bring their own kayaks or canoes.
Campgrounds operate seasonally from spring through late autumn; day-use areas generally remain open year-round.
Leashed pets are allowed in campsites but strictly prohibited on the swimming beach and in buildings.
