fire 138L = length of largest Fire Appliance (currently 13m) d - cut-back distance is obtained by intersecting the imaginary corner of a building with A - C The minimum permissible widthI 15 N HWY 138. Fire Detail. Name: I 15 N HWY 138: Incident Type Category: Wildfire: Fire Cause: Undetermined: Fire Discovery Date Time: July 15, 2025, 4:26 p.m.