Blackwell Engineering Co.

of Merrifield, Virginia
Donaldson Run Bridge (Arlington County, Virginia)
Built 1959
Deck plate girder bridge over Donaldson Run on Gwmp
Open to traffic

Gulf Branch Bridge (Arlington County, Virginia)
Built 1959
Deck plate girder bridge over Gulf Branch on Gwmp
Open to traffic

Windy Run Bridge (Arlington County, Virginia)
Built 1959
Deck plate girder bridge over Windy Run on Gwmp
Open to traffic