COUNCIL BLUFFS, Iowa (FOX 42 KPTM) -- Officials a semi was driving eastbound on I-480 when the trailer began to tip from the curve.
They say at some point the load or the trailer hit the guardrail causing concrete chunks to fall onto I-480.
Officials say the trailer was hauling rolls of steel that got loose.
They say no one was hurt.
Officials say the ramp from I-480 east to I-29 North will remain closed over night.
The Iowa Department of Transportation Motor Vehicle Enforcement and the CBPD Traffic Unit are investigating the crash.