Narrative:

Cruising wbound on airway at 10500 ft in radar contact with ZLC VFR flight following. Center did not call out traffic and I didn't see traffic. However, about 20 mins past dru VOR, I reported on to spokane approach, at which point another aircraft told controller that I had missed him by 100 ft near dru VOR. Not sure of registration number of other aircraft.

Google
 

Original NASA ASRS Text

Title: SMA PLT HAD NMAC IN THE VICINITY OF A VOR.

Narrative: CRUISING WBOUND ON AIRWAY AT 10500 FT IN RADAR CONTACT WITH ZLC VFR FLT FOLLOWING. CTR DID NOT CALL OUT TFC AND I DIDN'T SEE TFC. HOWEVER, ABOUT 20 MINS PAST DRU VOR, I RPTED ON TO SPOKANE APCH, AT WHICH POINT ANOTHER ACFT TOLD CTLR THAT I HAD MISSED HIM BY 100 FT NEAR DRU VOR. NOT SURE OF REGISTRATION NUMBER OF OTHER ACFT.

Data retrieved from NASA's ASRS site as of July 2007 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.