B737NG captain reported finding 'minimal braking' available after landing on the snow covered runway...

Attributes
ACN	1410151
Time
Date	201612
Local Time Of Day	0601-1200
Place
Locale Reference	DTW.Airport
State Reference	MI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Air Traffic Control Fully Certified Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Air Traffic Control Military 4 Air Traffic Control Non Radar 2 Air Traffic Control Radar 2 Air Traffic Control Supervisory 2 Flight Crew Last 90 Days 450 Flight Crew Total 20000 Flight Crew Type 1100
Events
Anomaly	ATC Issue All Types Inflight Event / Encounter Weather / Turbulence

Narrative:

Dtw was having a snow event. ATC assigned and we accepted 21L. Braking action 3;3;3. On 8 mile final the first officer (first officer) as flying pilot asked to switch and have me land. He had to urinate so badly he could not concentrate.we landed and the deceleration seemed slow. I interpreted that we had minimal braking. ATC asked us to turn off at taxiway T. We were unable as the wheels did not have enough traction to make the turn. We asked for and received clearance to exit on 27L.27L was snow covered and may have been on the list as unusable as per snow removal perspective. We needed it to make a safe turnoff. Needless to say; when we were clear of 21L on 27L; we stopped and the first officer went to the restroom.snow crew cleared off T6 at our request and we taxied to the gate uneventfully.I think ATC and snow crew needed to coordinate better as not 15 mins after our landing another aircraft slid onto the grass while turning near 21L and T. ATC should have been more proactive in asking us why we could not turn off. We should have volunteered more information as well.

Original NASA ASRS Text

Title: B737NG Captain reported finding 'minimal braking' available after landing on the snow covered runway.

Narrative: DTW was having a snow event. ATC assigned and we accepted 21L. Braking action 3;3;3. On 8 mile final the First Officer (FO) as flying pilot asked to switch and have me land. He had to urinate so badly he could not concentrate.We landed and the deceleration seemed slow. I interpreted that we had minimal braking. ATC asked us to turn off at taxiway T. We were unable as the wheels did not have enough traction to make the turn. We asked for and received clearance to exit on 27L.27L was snow covered and may have been on the list as unusable as per snow removal perspective. We needed it to make a safe turnoff. Needless to say; when we were clear of 21L on 27L; we stopped and the FO went to the restroom.Snow crew cleared off T6 at our request and we taxied to the gate uneventfully.I think ATC and snow crew needed to coordinate better as not 15 mins after our landing another aircraft slid onto the grass while turning near 21L and T. ATC should have been more proactive in asking us why we could not turn off. We should have volunteered more information as well.

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.