We hear many positive comments about the graceful arches that support the new Interstate 5 bridge over the Willamette River. Currently, all I-5 traffic crosses the river on the new southbound bridge, supported by four arches.
Now our contractor is focused on building the four arches for the new northbound bridge. The first pair of arches stretches from the center of the river to the north. The arches will take about a year to construct. Then, crews will build the bridge roadway deck on top of them.
Looking north toward the riverbank, you can see the arch falsework that will form the arches for the new northbound bridge and the concrete columns that will soon help support the bridge deck. The matching southbound bridge is in the background.
To build the arches, concrete, poured in a series, fills in the falsework form around the rebar framework, and then is allowed to cure before the next pour higher up the arch. It will take many pours to reach the top of the arches. The smallest pour is the first 28 feet of the arch beginning at the bottom. The largest pour is 103 feet long, reaching to the top of the arch.
The wooden arch falsework supports the rebar skeleton of the arch for the second concrete pour.
Workers will follow the same process to build the arches from the center of the river to the south bank. After all the concrete is poured and cured, the arches will be ready for the final step of jacking them apart and filling in the remaining space with concrete. Then work on the deck will start.
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