Occoquan Bay National Wildlife Refuge

This moderate 43.0-mile road cycling loop around the Occoquan Reservoir and River offers scenic views and a substantial workout.

This moderate 33.2-mile (53.4 km) road cycling loop in Mason Neck State Park offers scenic views of Occoquan Bay and Belmont Bay.

This ambitious road cycling route, the Neabsco Creek Boardwalk – Four Mile Run Park loop from Lorton (Auto Train), is a demanding 125.2 miles (201.5 km) with 6250 feet (1905 metres) of elevation gain, requiring approximately 9 hours and 14 minutes to complete. It's a challenging, long-distance ride that connects two distinct trail experiences: the serene Neabsco Creek Boardwalk, an elevated path through wetlands, and the urban Four Mile Run Trail, which winds through shaded stream valleys. Expect to navigate significant stretches of public roads between these two points, making it best suited for experienced road cyclists comfortable with varied traffic conditions. You'll encounter unique scenery, from the Potomac waterfront and abundant birdlife on the boardwalk to views of Ronald Reagan Washington National Airport along Four Mile Run.

Planning for this difficult route requires careful attention, as there isn't a direct, established loop connecting these two locations from Lorton. For the Neabsco Creek Boardwalk, you can access it via Rippon Landing Park, which offers parking. The Four Mile Run Trail has numerous entry points, but be mindful that some sections can flood after heavy rain. This journey is a serious undertaking, demanding thorough route planning and an early start to manage the extensive distance and time required.

Both the Neabsco Creek Boardwalk and the Four Mile Run Trail are significant regional assets, each offering unique natural and recreational value. The boardwalk is part of the larger Potomac Heritage National Scenic Trail and is known for its wildlife viewing opportunities, while the Four Mile Run Trail is a key link in the