Narrative:

I had been sitting at the sector for about 15 mins. Bigsky approach (boise) flashed aircraft X; a (C421) probably 15 minutes before the aircraft would be in my airspace. The aircraft X had a final altitude of 090 in the data block. I brought up my mias knowing that this altitude would be below the mia along the route. After doing this; I came to the conclusion that 100 would be a safe altitude for aircraft X. Bigsky approach called me for something (don't remember now) and I asked the controller to climb aircraft X to 100 for terrain. She responded 'wilco' and took the hand off back. I continued to work and sometime later accepted the hand off on aircraft X at 120. 'Even better;' I thought to myself. I issued the boi altimeter to aircraft X when the aircraft checked on and went back to working without re-checking my mias. Aircraft X was now between 5 and 10 nm north of the original route that I had looked at earlier. The MSAW alert went off on aircraft X for a 129 mia ahead. I measured aircraft X's current heading and believe it was like a 092. I issued a right turn to a heading of 110 to aircraft X thinking that I went more then needed on the heading. I continued to work and kept checking back on aircraft X. It looked close to me; but I believed the heading was working and would ultimately work. The MSAW never stopped flashing that kept me second guessing. I felt that the aircraft was on the boundary of the 129 mia; but still clear. But; the fact that the MSAW didn't stop flashing until the aircraft was clear of the mia makes me question if I was safe or not?first off; I should have re-examined aircraft X's route and the mia's along it. Secondly I should have issued a stronger turn to the aircraft ensuring that it would stay plenty clear of the higher mia.

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Original NASA ASRS Text

Title: Salt Lake Center Controller reported an unsafe situation where an aircraft was given an altitude to maintain below the Minimum IFR Altitude.

Narrative: I had been sitting at the sector for about 15 mins. BigSky APCH (Boise) flashed Aircraft X; a (C421) probably 15 minutes before the aircraft would be in my airspace. The Aircraft X had a final altitude of 090 in the data block. I brought up my MIAs knowing that this altitude would be below the MIA along the route. After doing this; I came to the conclusion that 100 would be a safe altitude for Aircraft X. BigSky APCH called me for something (don't remember now) and I asked the controller to climb Aircraft X to 100 for terrain. She responded 'wilco' and took the hand off back. I continued to work and sometime later accepted the hand off on Aircraft X at 120. 'Even better;' I thought to myself. I issued the BOI altimeter to Aircraft X when the aircraft checked on and went back to working without re-checking my MIAs. Aircraft X was now between 5 and 10 nm north of the original route that I had looked at earlier. The MSAW alert went off on Aircraft X for a 129 MIA ahead. I measured Aircraft X's current heading and believe it was like a 092. I issued a right turn to a heading of 110 to Aircraft X thinking that I went more then needed on the heading. I continued to work and kept checking back on Aircraft X. It looked close to me; but I believed the heading was working and would ultimately work. The MSAW never stopped flashing that kept me second guessing. I felt that the aircraft was on the boundary of the 129 MIA; but still clear. But; the fact that the MSAW didn't stop flashing until the aircraft was clear of the MIA makes me question if I was safe or not?First off; I should have re-examined Aircraft X's route and the MIA's along it. Secondly I should have issued a stronger turn to the aircraft ensuring that it would stay plenty clear of the higher MIA.

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.