B767 First Officer reports failure of the Center Hydraulic System approaching destination. QRH procedures are complied with and aircraft lands with flaps 20 at destination airport.

Narrative

I was the pilot flying. Approximately one hour out from landing there was an indication of low hydraulic pressure in the center hydraulic system indicated by the EICAS and on the overhead hydraulic panel. I continued to fly the aircraft while the pilot not flying ran the appropriate checklist in the QRH. After completing the checklist and ensuring a stable flight condition we recalled the Captain to the flight deck and briefed him on what had happened. I continued to fly the aircraft and monitor ATC communications while the Captain and First Officer contacted Dispatch and Maintenance Control. After conferring with both; we elected to declare an emergency with ATC and continued to destination. We requested and received clearance for an extended straight in approach and configured the aircraft for a flaps 20 approach and landing. I accomplished the approach and landing; which were uneventful. After landing the Captain took control of the aircraft and exited the runway at a high speed taxiway where we stopped and had the aircraft inspected by Airfield Operations and the Fire Department before taxiing to the gate.