Ghost Rivers: Sumwalt Run Walking Tour

The story

Underneath the brick rowhouses and concrete grid of Remington, a 1.5-mile ghost is trapped in a storm sewer. In the early 1900s, city engineers encased Sumwalt Run—a rocky stream that carved out the wooded ravine now known as Wyman Park Dell—into underground concrete culverts to expand Baltimore’s municipal sewer system and smooth over the land for development. Artist Bruce Willen mapped its grave, embedding capri-blue thermoplastic lines across city sidewalks, curbs, and asphalt to trace where the stream once ran above ground.

The self-guided trail links 12 powder-coated metal markers that document what was lost when the waterway was buried. The signage digs into more than just urban hydrology: it marks where local ice ponds were harvested, how 19th-century stone quarries supplied building foundations across the city, and how mid-century Appalachian migrants like bluegrass pioneer Hazel Dickens settled along the former stream corridor.

Because the stream is still very much alive, it periodically rebels against the paved grid overhead. Fluctuating water tables and heavy rains regularly force Sumwalt Run back into rowhouse basements, muddying feet in the Dell and sending subterranean echoes up through street-level storm grates. The installation doesn't physically daylight the river, but it forces you to walk through central Baltimore aware that thousands of gallons of water are rushing 30 to 40 feet directly beneath your shoes.