PROSSER -- A semi-truck hauling potato silage rolled over south of Prosser, forcing the closure of Highway 221 for about four hours.
The wreck happened around 2:45 p.m., about 17 miles south of Prosser, authorities said.
Initial reports indicated there were no injuries to the driver.
State Department of Transportation officials closed Highway 221 in both directions while crash debris and potato silage was cleared.
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A single lane of alternating traffic was allowed to move through the scene by around 5 p.m., and the highway was re-opened 90 minutes later.