Ball of light that flew overhead across the sky at a steady speed

I arrived just before 5:00 am to fish in the morning at the Merwin fish hatchery boat ramp in Woodland, WA. Looking towards the west above the tree line I saw a bright light and after a few seconds I noticed it moving at a steady pace heading towards me in the west. I started recording the object on my phone about 10 seconds from the time I noticed it. It continued to fly west above my head until it disappeared behind the horizon directly on the other side of the dam at Merwin reservoir. While watching the object the bright light stayed illuminated at the same brightness ever after passing overhead as if the entire outside of the object was illuminated. The object appeared to be close enough and bright enough that I would be able to see the red and green navigation lights found on planes. It also seemed close enough that I would be able to hear the sound of an engine. The area was completely silent and I was the only one there for the first 75% of the encounter. My friend John arrived as it was in the west where I ended the video and showed him the object. Both of us were unable to explain the encounter.