The accident was reported about 12:40 p.m. at the onramp to southbound I-5 from the Boeing Freeway, officer Aaron Snell said.
The ramp was temporarily closed to remove the truck and its load from the road, Snell said.
The driver was 41, of Woodburn, Ore.
Police are looking at speed as a possible factor in the crash, Snell said.
No other vehicles were believed to be involved.
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