The Menai Suspension Bridge was closed for a safety inspection after it was crossed by an overweight vehicle.
It's the second time this month that the bridge has been closed temporarily after being used by a vehicle exceeding the weight restrictions.
A 7.5 tonne limit is in place while phase two of extensive maintnenance work is continuing.
TraffIc Wales said on Monday afternoon that the road had to be closed to carry out an inspection as a result.
A spokesperson added: "Apologies for the inconvenience but our priority is your safety. We wish to remind you that only vehicles under 7.5t are allowed to use Menai Bridge."
The bridge was reopened shortly before 7pm on Monday evening.
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