Eckhart Field,  Porthill, Idaho (1S1).  Eckhart is an excellent grass strip 3650 feet long and 150 feet wide - elevation 1756'.   CTAF 122.8 Land on runway 33 and taxi to the north end of the field.  Customs monitors 122.8 if you need help.  Follow the signs to customs as you taxi across a road, past a hanger and on to a tie down area.  Park on the Canada side to the left. You may call 1-888-CANPASS from your cell phone after landing, or you can walk a block (up the wooden stairs to the road) to the customs office one block north to use their phone. Customs usually does not want to look at the aircraft.  US customer is also on the road, one block south of the tie down area.