PORTLAND, Ore. (AP) Oregon Parks and Recreation officials say four Portland bridges across the Willamette River have been listed this week in the National Register of Historic Places.

The four Broadway, Burnside, Hawthorne and Morrison represent a range of bridge technology used nationally during the 20th century.

Oregon Transportation Department senior historian Robert Hadlow says bridges have connected Portland residents on both sides of the river since the 1880s. He says listing four of the city's bridges recognizes just how important these structures are for their engineering and for their role in the city's rich history.

The oldest of the four, the Hawthorne Bridge of 1910 was originally built for horse and street-car systems. It was converted by the 1950s to serve car and bus traffic.

The newest bridge, the Morrison, opened in 1958 at the location of two previous bridges.

Portland stages an annual bridge festival and a bridge ride for bicycles.

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