It ends at an intersection with SR 641 (Chapel Road) on the Clifton / Fairfax Station border.

SR 612 then turns southwest on Yates Ford Road at the Clifton / Fairfax Station border and travels through another residential area consisting of single-family homes.

[4] Old Yates Ford Road starts at the Y intersection mentioned above, and continues west toward the SR 612 Fairfax / Prince William Bridge.

When SR 612 empties from the bridge to Prince William County, the speed limit is raised to 40 mph (64 km/h).

Yates Ford Road was known as early as 1716, for there are records that, on December 7, 1716, Lady Catherine Fairfax granted Wansford Arrington 335 acres (1.36 km2).

[7] Yates Ford can be found on the 1862 War Department Map, where its position is consistent with the present terminus of Birmingham Drive.

http://www.davidrumsey.com/maps4020.html The original Yates Ford appears to be between Yates Ford Road in Clifton, at Hemlock Regional Park, and Birmingham Drive on the Manassas Park / Prince William County border.

[8][9] In 1997 the original 30-year-old bridge crossing Bull Run was replaced by the Virginia Department of Transportation.

[7][9] That section of Yates Ford Road is now a group of large single-family homes that are nestled against the boundary of the park.

Silt filled up the Occoquan River, making Colchester untenable as a seaport.