Narrative:

While performing an ILS approach to the hayden airport on an IFR flight plan, after reporting procedure turn inbound to den center and hayden (yampa valley) unicom, upon breaking out of the low overcast at approximately 400' and 1/2 mi visibility. I observed and had to fly over a snow plow truck on the runway at the T/D end of the active. There was no NOTAM. After inquiry, I was told that the trucks are not equipped to monitor unicom. Fortunately the truck was not moving in my same direction. A missed approach was not desirable.

Google
 

Original NASA ASRS Text

Title: GA SMA LANDED OVER THE TOP OF A SNOW PLOW TRUCK WORKING ON THE TOUCHDOWN END OF THE RWY.

Narrative: WHILE PERFORMING AN ILS APCH TO THE HAYDEN ARPT ON AN IFR FLT PLAN, AFTER RPTING PROC TURN INBND TO DEN CENTER AND HAYDEN (YAMPA VALLEY) UNICOM, UPON BREAKING OUT OF THE LOW OVCST AT APPROX 400' AND 1/2 MI VIS. I OBSERVED AND HAD TO FLY OVER A SNOW PLOW TRUCK ON THE RWY AT THE T/D END OF THE ACTIVE. THERE WAS NO NOTAM. AFTER INQUIRY, I WAS TOLD THAT THE TRUCKS ARE NOT EQUIPPED TO MONITOR UNICOM. FORTUNATELY THE TRUCK WAS NOT MOVING IN MY SAME DIRECTION. A MISSED APCH WAS NOT DESIRABLE.

Data retrieved from NASA's ASRS site as of August 2007 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.