A motorcyclist is dead after crashing into the side of a bridge in the Waikato today.

The accident happened on Roto O Rangi Rd, between Te Awamutu and Cambridge, shortly after 5pm today.

Police said the motorcyclist appears to have hit the side of a bridge.

No other vehicles were involved in the crash.

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Roto O Rangi Rd is currently closed and diversions are in place on Storey Rd and Long Road.

The Serious Crash Unit is in attendance and police expect the road to remain closed for at least another two hours.