B737-800 captain reported experiencing a 'severe rolling motion' shortly after takeoff from dfw from...

Attributes
ACN	1354227
Time
Date	201605
Local Time Of Day	1201-1800
Place
Locale Reference	DFW.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

We experienced a severe rolling motion due to wake turbulence behind a B-757 on takeoff from dfw 36R. I was cleared for takeoff immediately after tower cleared the B-757 for takeoff. I started my takeoff roll about 1:25 after the B-757. I encountered the wake turbulence approximately 250-300 AGL and had to use approximately 60 degrees of aileron to counter the wake upset. This is the first time I did not use a two minute separation behind a B-757. I notified tower of the encounter with the wake turbulence. I will now accept only a 2 minute interval behind B-757 per my option from aim 7-3-9 and part 1; 5..7.2.B.

Original NASA ASRS Text

Title: B737-800 Captain reported experiencing a 'severe rolling motion' shortly after takeoff from DFW from wake turbulence in trail of a B757.

Narrative: We experienced a severe rolling motion due to wake turbulence behind a B-757 on takeoff from DFW 36R. I was cleared for takeoff immediately after tower cleared the B-757 for takeoff. I started my takeoff roll about 1:25 after the B-757. I encountered the wake turbulence approximately 250-300 AGL and had to use approximately 60 degrees of aileron to counter the wake upset. This is the first time I did not use a two minute separation behind a B-757. I notified tower of the encounter with the wake turbulence. I will now accept only a 2 minute interval behind B-757 per my option from AIM 7-3-9 and Part 1; 5..7.2.B.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737-800 captain reported experiencing a 'severe rolling motion' shortly after takeoff from dfw from wake turbulence in trail of a B757.