A large dock with a commemoration plaque in Japanese has washed ashore on the Oregon coast, raising speculation that it could be debris from last year’s tsunami in Japan.

Oregon parks spokesman Chris Havel said Wednesday that a photo of the plate was emailed to the Japanese consulate in Seattle for review.

The dock washed ashore Tuesday on Agate Beach, a mile north of Newport in central Oregon. It’s made of concrete with a metal pontoon and measures 66 feet long, 19 feet wide and 7 feet high.

Fast-moving debris from the tsunami has begun arriving on the shores of North America. It includes a soccer ball and a shipping container holding a Harley-Davidson motorcycle with Japanese license plates.

The bulk of the debris is not expected until winter.