MILWAUKEE COUNTY, Wis. (CBS 58) -- The National Avenue off-ramp from northbound I-43 closed Monday, Dec. 19, due to a rolled over semi. 

The Milwaukee County Sheriff's Office says the overturned semi was caring a full load of scrap metal. 

Officials expect the closure to be lengthy. 

TRAFFIC ALERT: The N/B I-43 off-ramp to National Ave. is closed, as MCSO responds to an overturned semi that was caring a full load of scrap metal. No word yet on any associated injuries. Expect the closure to be lengthy, given the payload & cleanup.

— Milwaukee County Sheriff's Office (@MilwCoSheriff) December 19, 2022