Greenwood Furnace S. P.

Greenwood Furnace S.P. sits in Pennsylvania along East Branch Standing Stone Creek. Swimmers come for a natural day on the water without resort amenities.

The park sits on land once dominated by a 19th-century iron-making operation, and the ghost town remnants of Greenwood village still stand among the trees, lending the whole place an atmosphere that feels both haunted and alive. When you arrive in summer, the air carries the green, resinous scent of surrounding Rothrock State Forest, and the sound of water drawing you toward the lake is hard to resist. The lake's natural origins give it that characteristic Pennsylvania freshwater feel. Cool even on the hottest July afternoons, with a clarity that hints at its clean, creek-fed source. The surrounding landscape is layered and textured: old stone ruins peek through the undergrowth, herons pick their way along the shallows, and if you arrive early in the morning, mist still clings to the water's surface before the day burns it away. Adjacent to Rothrock State Forest, the park connects to a vast network of trails and wild terrain that makes even a simple swim feel like part of something larger. The lake's cool temperatures make it especially welcome during the peak of summer heat, and the creek-fed water maintains a freshness that distinguishes it from warmer, murkier alternatives.

You'll find this is a . Not a manicured resort pool, but a genuine natural lake experience with all its pleasures and textures. The park provides a full range of on-site facilities, so you can arrive without worrying about the basics. Restrooms, changing areas, and other amenities are in place to make your visit comfortable. Entry to the park carries no fee, making it an accessible option for families and budget-conscious travelers. Camping is available on-site as well, which means you can extend your time here and catch the lake at golden hour, when the light turns amber and the ridges go dark against the sky. Local Character and When to Visit What sets Greenwood Furnace apart from a straightforward .

Treat Greenwood Furnace S.P. as a wild swim: no lifeguard, variable depth, and rules that can change by season.

Greenwood Furnace S.P. works well as a day trip from State College. Stock up in town, then head to the water with food, water, and sun protection. Combine the swim with camping at Mount Gretna Lake or browse more Pennsylvania lake spots in our directory. For the full list in Pennsylvania, see our state directory.

Park entry does not require a fee. All necessary facilities, including restrooms and picnic areas, are available on-site. The swimming area is accessible from the main parking lot via marked paths.

Rich industrial history tied to Pennsylvania’s iron-making heritage; ghost town remnants provide a glimpse into 19th-century life.

Adherence to Leave No Trace principles is essential to protect the ecosystem and preserve the park’s biodiversity.