DURING RELIEF BRIEFING ARTCC RELIEVING AT ZMP DID NOT HEAR THE RELIEVED CTLR TELL HIM THAT ALPENA APCH CTL WAS IN OP. THIS RESULTED IN THE ARTCC CTLR CLRING AN ACFT FOR A VISUAL APCH TO ALPENA ARPT RESULTING IN AN OPDEV.

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I RECEIVED A POS RELIEF BRIEFING AND ASSUMED CTL OF THE SECTOR AT XA34. FLINT LOW SECTOR APREQED ACFT X OFF DTW DIRECT APN AT 13000 FT. ACFT X CHKED ON FREQ AND SEVERAL MINS LATER ASKED FOR LOWER. I ASSIGNED DSCNT TO 5800 FT. ACFT X RPTED ALPENA; MI; ARPT IN SIGHT; WAS ISSUED A VISUAL APCH; AND CHANGED TO ARPT ADVISORY FREQ. ABOUT 2 MINS LATER ALPENA APCH CALLED ON THE VOICE PAGE LINE AND ASKED IF I HAD ANY ACFT IN THEIR AREA. I TOLD THEM I FORGOT THEY WERE OPEN AND IMMEDIATELY GAVE THEM THE INFO ON ACFT X. I DID NOT IN FACT REMEMBER THE MENTION OF ALPENA APCH DURING MY RELIEF BRIEFING WHEN ASSUMING CTL OF THE SECTOR. AT THE TIME OF THE INCIDENT; I BELIEVED THAT ALPENA APCH WAS CLOSED. I BELIEVE THE MAIN CONTRIBUTING FACTOR TO THIS INCIDENT IS THE IRREGULAR HRS OF OP BY THIS PART TIME APCH CTL. THE SECOND CONTRIBUTING FACTOR WAS LACK OF USE OF RELIEF BRIEFING CHKLIST IN A CHALLENGE/RESPONSE FORMAT. THE CHKLIST ITEMS WERE COVERED BUT IN A RAPID-FIRE FASHION AND MY MIND WAS BUSY DIGESTING A PREVIOUS CHKLIST ITEM WHEN MENTION OF 'ALPENA APCH IS OPEN' WAS MADE; SO I DIDN'T 'HEAR' IT. THE APCH CTL AIRSPACE WAS NOT 'TAGGED' ON THE RADAR SCOPE WITH A CST DATA BLOCK.