“Flash vs. Arrow” Filming Locations
The Flash episode “Flash vs. Arrow” was filmed in Vancouver in Canada.
Pacific Backlot Services as Central City Homeless Shelter
Barry paints a homeless shelter using his super-speed.
Homer Street (between Dunsmuir & Pender) as Barry Attacks Eddie
Barry pulls Eddie from Iris's car and attacks him before being stopped by Oliver.
Alley (south of Homer, west of Pender) as Flash vs. Arrow Fight
Oliver tries to stop Barry who is under the control of Rainbow Raider.
Alaska Street (between Juneau & Alpha) as Under the Bridge
The guys come upon Ronnie under a bridge and turn into Firestorm.
Source: TudoutheCorgi — Twitter via What's Filming