After arriving in the area the pilot was unable to locate the destination strip. He decided to land on a gravel road near a house to seek directions. Shortly after a normal touchdown the nosegear collapsed and the aircraft came to rest in a drain beside the road. The pilot reported that there had been nosewheel shimmy during the previous take-off and just prior to the nose leg collapsing. The pilot had not previously operated into the strip at his intended destination. The nose wheel tyre was found to be deflated, and it is likely that it had become deflated during the previous take-off. However, due to the extent of the damage caused to the tyre during the landing, it was not possible to determine the reason the tyre had become deflated.