Small Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3.0
Situational Awareness; Communication Breakdown; Confusion; Distraction
ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Taxiway; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Became Reoriented
Weather; Human Factors; Chart Or Publication; Airport
Aircraft X requested taxi from south ramp. I issued taxi instructions to Runway 31 via C; A. Aircraft X requested an intersection departure; I re-issued taxi instructions to Runway 31 at B. Due to the moderate snow and reduced visibility from the Tower cab; I was not able to see Aircraft X from the Tower cab. Aircraft X then asked if Taxiway B was swept or cleared. I asked Airport Sweeper if they had plowed Taxiway B; Airport Sweeper then advised that Aircraft X had turned the wrong direction on Taxiway A and proceeded to the old Taxiway B location which does not exist; but is still depicted on the current airport diagram. If Airport Sweeper had not advised this; Aircraft X would have taxied off of the Taxiway A surface. Ensure the airport diagram is updated in a timely manner to prevent this confusion. Aircraft X is a locally based aircraft and was unfamiliar with the airfield changes; ensure that the local airport authority is keeping airport tenants notified and updated on airfield changes. FAA Central Region Airports Office needs to issue an airport construction diagram as current airfield NOTAMs have been slow to be updated. FAA SUX ATCT Management has verbally been advising ATCS's not to put Airfield Surface NOTAMs on the ATIS broadcast; Airfield Surface NOTAMs in my opinion are critical safety messages; they should not be interpreted by ATCS's whether or not they should go on an ATIS broadcast and should be placed on the ATIS broadcast as written by the issuing authority.
SUX Tower Controller reported an aircraft taxied onto a closed taxiway due to the airport diagram chart not being updated and ATC being instructed not to include the taxiway change on the ATIS broadcast.