Regional Jet 900 (CRJ900)
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
ATC Issue All Types; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action; Flight Crew Requested ATC Assistance / Clarification
Environment - Non Weather Related; Procedure
Given takeoff clearance from 21R in DTW behind a 757 before the aircraft had finished rotating. I turned on continuous ignition in case of wake turbulence encounter. We got a small jolt of wake turbulence at 200-300 ft AGL. At less than 1000ft; we encountered significant wake turbulence requiring full deflection of roll controls at least 3 times. I saw the 757 had turned left and told the First Officer (FO) to ask for runway heading to get out of the turbulence. When the FO advised the Tower; the reply was 'there is no wake turbulence.' I informed the controller that we had been full deflection on the flight controls to counter the turbulence. He then gave us runway heading. The Tower no longer [provides] wake turbulence separation on 757s. Provide wake turbulence separation on 757s.
CRJ-900 Captain reported encountering wake turbulence departing DTW in trail of a B757.