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Hawthorne Bridge

After our trip along the east side of Mount Rainier and Mount St. Helens we arrived late in the afternoon in Portland. The next day we should have a long trip along the pacific coast to Ashland, so we had just the evening to explore Portland. Afterwards we did regret that we didn’t plan to stay one day longer, for Portland appears to be an attractive, fast developing city with a lot of interesting buildings and bridges.
One of these bridges is the Hawthorne Bridge, a vertical lift bridge.

The main picture shows one of the two counterweights (450 tons)
Workshop one shows the bridge from the south side.
Workshop two shows the bridge from the north side with the Marquam Bridge and the Tilikum Crossing in the background.

Make: SONY
Model: ILCE-6300
Software: PaintShop Pro 19,00
Exposure Time: 1/125 sec
F-Stop: f/5.6
ISO Speed Ratings: 160
Focal Length: 81 mm
Date Taken: 2017-08-03 19:44
Metering Mode: Pattern
Flash: Flash did not fire, compulsory flash mode
File Size: 6130 kb


Originally constructed in 1910, the Hawthorne Bridge is the oldest operating vertical lift bridge in the United States. The Hawthorne Bridge is one of Portland’s busiest bridges, safely carrying approximately 30,000 cars and trucks, 800 TriMet buses, 8000 bicycles and untold pedestrians daily across the Willamette River. Vertical clearance for river traffic is lower than the other bridges, requiring as many as 200 openings per month. The main span can be raised 33m. to allow vessels to pass underneath.

Like other vertical lift bridges, the Hawthorne Bridge uses a system of counterweights and cables to move the lift span straight up and down. The operating system is mostly original, but the electrical power and control systems—which were installed in 1975—were upgraded in 1999. Hawthorne’s counterweights each weigh 450 tons and are supported by the bridge’s two towers, which rise 50m. above the bridge deck. Major structural modifications on the truss spans have included:

The Hawthorne’s main river span is made up of six spans for a total length of 420m. The three spans east of the lift span section are each 64m. long; the lift span is about 145m. long; the tower spans (which flank the lift span) are each 75m. long. The towers rise 50m. above the bridge deck and support the bridge’s two counterweights, which each weigh 450 tons. (www.multco.us/bridges)

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Additional Photos by Rob Zwemmer (alvaraalto) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4296 W: 318 N: 6297] (25352)
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