Ivan D. Merchant

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Ivan D. Merchant (1906-1997) was an engineer with the Oregon State Highway Department from 1929 until his retirement in 1972. During his time with the department Merchant served in many positions within the bridge department beginning as a construction inspector and finally retiring the state bridge engineer. Merchant was an instrumental design engineer within the staff of Conde B. McCullough during the design and construction of the large bridges along the Oregon coast.

Merchant began his carrier after graduating from Oregon Agricultural College in 1929. One of his first assignments was as a construction inspector on the Rogue River Bridge in Gold Beach. By 1933 Merchant had promoted to a designer position and at the age of 27 he designed the main arch spans for the Yaquina Bay Bridge.

In 1957 Merchant became the State Bridge Engineer for the highway department. Under his direction the bridge department designed and constructed many of Oregonís largest structures including the Astoria-Megler Bridge over the mouth of the Columbia River and the Marquam Bridge over the Willamette River in Portland. Merchant is best recognized for leading the design and construction of Oregonís tallest bridge the Thomas Creek Bridge on U.S. 101 along the South Oregon Coast.

Merchant retired from the highway department in 1972 and died in 1997 in Salem, Oregon. Merchant was the last engineer at the Oregon State Highway Department to work along side notable bridge engineer Conde McCullough.

ENGINEERING HISTORY:

- Construction Inspector, Oregon State Highway Department (1929-1932)

- Bridge Design Engineer, Oregon State Highway Department (1932-1957)

- State Bridge Engineer, Oregon State Highway Department (1957-1972)


Astoria-Megler Bridge (Clatsop County, Oregon)
Bridge Engineer - Oregon, 1966
Continuous rigid-cantilever Warren through truss bridge over Columbia River on US 101 in Astoria
Open to traffic

I-5 - Booth Ranch Bridge (Southbound) (Douglas County, Oregon)
Bridge Engineer, 1965
Warren deck truss bridge over South Umpqua River on Southbound I-5
Open to traffic

I-5 - Marquam Bridge (Multnomah County, Oregon)
Bridge Engineer, 1966
Cantilevered Warren deck truss bridge over Willamette River on I-5 in Portland
Open to traffic

I-5 - Shady Bridges (Douglas County, Oregon)
Bridge Engineer - Southbound, 1955
Lost pair of Warren deck truss bridges over South Umpqua River I-5 in Green
Replaced by a concrete box girder bridge in 2009

I-5 - Winchester Bridge (Southbound) (Douglas County, Oregon)
Bridge Engineer, 1964
Warren deck truss bridge over North Umpqua River on I-5 Southbound
Open to traffic

Isaac Lee Patterson Bridge (Curry County, Oregon)
Construction Inspector, 1930
Concrete arch bridge over Rogue River on US 101 in Gold Beach
Open to traffic

John Day River Bridge (Gilliam County, Oregon)
Bridge Engineer, 1963
Warren deck truss bridge over John Day River on I-84
Open to traffic

Thomas Creek Bridge (Curry County, Oregon)
Bridge Engineer, 1961
Continuous Warren deck truss bridge over Thomas Creek on US 101
Open to traffic

Unity Overcrossing (Baker County, Oregon)
1965 - Reconfig. Bridge Engineer, 1922
Concrete tee beam bridge over Union Pacific Railroad on Old US 30
Open to traffic

Yaquina Bay Bridge (Lincoln County, Oregon)
Design Engineer - Main Steel Spans, 1934
Steel through arch bridge over Yaquina Bay on US 101 in Newport
Open to traffic

Youngs Bay Bridge (New) (Clatsop County, Oregon)
Bridge Engineer, 1964
Vertical lift bridge over Youngs Bay on US 101 in Astoria
Open to traffic