Thursday, February 1, 2024

1936,2018 US-101 Conde B. McCullough Memorial Bridge over Coos Bay at North Bend, OR

(Bridge Hunter broke Mar 22, 2023; Historic Bridges; HAER; Satellite, 269 photos)

Street View, Jul 2019

HAER ORE,6-NOBE,1--11
11. Perspective view from southwest - Coos Bay Bridge, Spanning Coos Bay on Oregon Coast Highway, North Bend, Coos County, OR

Phil Block posted
Conde B. McCullough Memorial Bridge 
On a Foggy Morning
Opened in 1936 and listed on the National Register of Historic Places, the 5,305 foot [1.6km, 1mile] bridge crosses Coos Bay.  Previously named the North Bend Bridge it was renamed in 1947 after Mr McCullough passed away.  He designed 11 bridges on the Oregon Coast Highway.

Significance: The Coos Bay Bridge is historically significant as one of the five Depression-era PW A bridges that completed the Oregon Coast Highway. The completion of these bridges marks the dividing line between the period of relative isolation and dependence on sea transportation of Oregon's southern coastal region to its modern era of land transportation and connection with the hinterland. The Coos Bay Bridge is also representative of the innovative designs by State Bridge Engineer Conde B. McCullough, a pioneer in American concrete bridge design. The McCullough Memorial Bridge includes early examples of concrete arches constructed using Considere-type hinges. The cantilever truss design also represents McCullough's attention to aesthetics, in that the upper and lower chords were curved to complete the arch motif of the bridge. The sway bracings of the truss are also curved to give motorists the impression of driving under a series of arches as they travel over the bridge. [HAER_data
I got a portal view after reading about the sway bracings.
Street View, Jul 2022

I noticed that ODOT has recently done some needed maintenance. HistoricBridges explains: "As of 2018, this bridge had received an extensive rehabilitation of its concrete arch spans. In 2019, a three year project to repaint the bridge will take place."
Street View, May 2018

HistoricBridges
Main span length: 793' (241.7m)

Engineering News-Record

HistoricBridges, 1 of several construction photos

Even the piers have an aesthetic touch.
OregonsAdventureCoast

A source indicated that pedestrians can use the bridge. The portal views made me wonder because the sidewalks are so narrow, and there is no barrier between the pedestrian and vehicular traffic. But this photo shows that it does support pedestrian traffic. I did see in another portal view that the speed limit is 35mph.
HAER ORE,6-NOBE,1--15
15. Detail, Art Deco motifs on stairway at south abutment

When completed, it was the longest bridge in the state highway system. The navigation channel is 793' (243m) wide with a clearance of 150' (45.7m). [OregonEncyclopedia]

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