PLT WAS EXECUTING CATEGORY I ILS APCH TO RWY 34L AFTER FLYING FROM HON TO SLC. PLT SAID HE 'CAME OFF GAUGES' AT 300 FT AGL EXPECTING TO SEE RWY BUT DIDN'T. AT 200 FT AGL, HE SAW RWY 150 FT TO LEFT BUT LOST ALL DEPTH PERCEPTION. PLT CONSIDERED EXECUTING MISSED APCH BUT FELT HE COULD ALIGN ACFT WITH RWY WITH ALT REMAINING. WHILE MANEUVERING, NO. 1 ENG STRUCK RWY, LEAVING 50-60 FT LONG, 1-INCH DEEP GOUGE. IN PREVIOUS 30 HR PERIOD, PLT HAD BEEN ON DUTY 18 HRS, 30 MIN, AND HAD FLOWN 13 HRS, 25 MIN. HE HAD BEEN OFF DUTY 11 HRS, 24 MIN, BUT HAD SLEPT ONLY 1 HR.