C172 pilot reports 4-day-old NOTAM for ice at PLK that did not exist at the time and date of his arrival.

Narrative

There was an ice storm in the area of the airport. On the day of flight; DUATS was used for weather briefing; accompanied by a call to the airport (which did not connect) and a call to a local resident. DUATS reported VFR and clear; but reported 'Point Lookout MO (M. Graham Clark -- Taney County) [PLK]: January NOTAM XXX issued by Columbia MO [COU] Aerodrome 1 in ICE braking action nil.' Since this was four days old; the calls to the local area were made. It was reported that the ice had initially caused very slick conditions; but that subsequent snow (approx 1-2 inches) and sleet had improved the conditions considerably and warm temperatures had further improved braking. Conditions would be similar to snow-packed runways; with which I had experience. Upon arriving in the area; calls to the UNICOM went unanswered. The runway was snow covered; but tire tracks visible confirmed the local report received earlier that day. Landing and taxi was uneventful; braking action was reasonably good for snow-packed conditions. The airport facilities were open; but the desk operator indicated that he thought that planes would not be landing due to the NOTAM; and used the term 'closed.' I inquired whether there was anything but the braking action NOTAM and was told that there was not. I reported that the braking action was reasonably good for snow-packed conditions. The airport was in use by helicopter traffic at the time. Departure about 2 hours later was similarly uneventful. Taxi and takeoff were performed with soft field technique since the snow had softened slightly in the afternoon. Tire indentations into the snow was approx 3/4 to 1 inch. Takeoff roll was normal for soft-field conditions. My primary concern is the outdated NOTAM. Runway conditions were actually considerably better regarding braking than reported. Snow/ice conditions change fairly quickly over time and a 4-day old NOTAM becomes questionable. An updated NOTAM on the reported conditions was in order. In retrospect; it would have been better had I been able to contact the airport desk; rather than rely upon other local sources for runway information. Unfortunately; Flight Service would be of little help; because they would be relying upon the same outdated NOTAM.