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The Grist Mill Trail at Patapsco Valley State Park course for 2.5 miles through the heavily wooded park between Ilchester Road and Lost Lake. The trail is gentle and wheelchair accessible. It passes by the Swinging Bridge and the site of the former Bloede's Dam. The bridge crosses the Patapsco at Orange Grove and allowed locals to cross the river to work in the Orange Grove Flour Mill. The mill burned in 1905, but you can cross the bridge to view the ruins. Bloede's Dam, on the National Register of Historic Places, was said to be the world's first submerged electrical generating plant, which was housed under water inside the dam. No longer generating electricity since the 1930s, the dam was removed in September 2017 to restore river habitat upstream.
Patapsco Valley State Park was created in 1907 and is one of Maryland's oldest state parks. As a consequence, the area has many historic sites and also preserves a valuable greenway in this urban area. Railroad remnants can also be seen, like that of the Baltimore and Ohio (B&O) Railroad, which ran between Baltimore and Ellicott City.
Parking is available at Patapsco Valley State Park (5120 South Street, Halethorpe). Once in the park, the closest parking lot for the southeastern trailhead is on Glen Artney Rd, just north of its intersection with Soapstone Trail road in Halethorpe. Additional parking is available at various locations in the park.
There is a fee to enter the park. For just the entrance fee information, visit the Maryland DNR Patapsco Valley State Park Service Charge page. For the park's amenity fees (including camping), visit the Service Charges for Maryland State Parks page and view the information for Patapsco Valley State Park.
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