Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 26
Situational Awareness; Human-Machine Interface; Confusion; Time Pressure
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic
Human Factors; Procedure
The Denver 8 Controller handed us two aircraft at the same altitude. Aircraft X and Aircraft Y were on converging courses at FL350. I called the Denver 8 Controller to reroute Aircraft Y to direct BDF when Aircraft Y was one minute outside our boundary. Aircraft X was 4 miles in front of Aircraft Y. Aircraft X was flying at MACH .77 and Aircraft Y was flying at MACH .80. If I hadn't initiated the call and given the Denver 8 Controller Control instructions; these two aircraft would have lost separation within two minutes of crossing our boundary!Recommendation: retrain Denver Center.
Minneapolis Center Controller reported that Denver Center would have given him a loss of separation if he had not called them and fixed it prior to aircraft entering his sectors airspace.