ZLC center controller reported that an aircraft reported a near midair collision with another aircra...

Attributes
ACN	1466533
Time
Date	201707
Local Time Of Day	0601-1200
Place
Locale Reference	ZLC.ARTCC
State Reference	UT
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft High Wing 1 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 7.8
Events
Anomaly	Conflict NMAC

Narrative:

Aircraft X called on ground at riw looking for an IFR clearance to ZZZ. Advised aircraft that there was no flight plan on file but would file it for him. Aircraft X gave the flight info; requested routing; requested altitude; etc. I then issued aircraft X an IFR clearance. In the area of riw there is poor to no radar coverage below 12000 ft MSL. Aircraft X checked on after departure climbing to 16000 ft. Because aircraft X was adsb equipped I was able to radar identify the aircraft out of 7000 and went on with other duties. A couple minutes later; the pilot of aircraft X broadcast that he had just had a near miss with another aircraft about 500 ft from him. There were no other targets in the area due to the lack of radar coverage so there was no way to call any traffic to him. Aircraft X happened to be on my scope because he has adsb onboard.

Original NASA ASRS Text

Title: ZLC Center Controller reported that an aircraft reported a NMAC with another aircraft in an area of poor radar coverage.

Narrative: Aircraft X called on ground at RIW looking for an IFR clearance to ZZZ. Advised aircraft that there was no flight plan on file but would file it for him. Aircraft X gave the flight info; requested routing; requested altitude; etc. I then issued Aircraft X an IFR clearance. In the area of RIW there is poor to no radar coverage below 12000 ft MSL. Aircraft X checked on after departure climbing to 16000 ft. Because Aircraft X was ADSB equipped I was able to radar identify the aircraft out of 7000 and went on with other duties. A couple minutes later; the pilot of Aircraft X broadcast that he had just had a near miss with another aircraft about 500 ft from him. There were no other targets in the area due to the lack of radar coverage so there was no way to call any traffic to him. Aircraft X happened to be on my scope because he has ADSB onboard.

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.

ZLC center controller reported that an aircraft reported a near midair collision with another aircraft in an area of poor radar coverage.