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How was McKee Bridge built?

McKee Bridge is the only bridge in Oregon that combines Howe trusses and outriggers. How did Jaston Hartman come up with this rare design?

Hartman was born in Ohio in 1868, grew up on a farm and received an 8th grade education. He followed his uncle, Arthur Bird Pool, to Jackson County in the 1890s and became a skilled builder of barns, houses, and ultimately bridges. Hartman’s cousin and assistant, Benton Pool, lived 3 miles downriver from where you are standing. When the county contracted “Hartman & Sons” to build the bridge, the sons – Wes and Lyal – were ages 16 and 15!

Building the Saltmarsh barn on Little Applegate in
1895. Jaston is on the peak, Benton second from right.
Wes and Lyal, Medford Mail-Tribune,
July 19, 1959.

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Left: Benton LaFayette Pool, May 16, 1940.
Right: Benton Pool’s log home, 1913.

Hartman added outriggers to the usual Howe truss design. They stabilize the upper chords and add a touch of elegance. Construction was largely a non-mechanized process, especially given the scarcities of World War I. Full trees were squared into beams. Port Orford cedars were split by hand into shakes for the roof. A team of four men strained on the wheel wrench to tighten bolts.

A Howe truss bridge incorporates diagonal
timber
beams slanting towards the center,
vertical iron rods,
and top chords.
William Howe patented the design
in 1840.