One of the most serious objections raised against covered wooden bridges is the lack of light. This was overcome in this case, as in other wooden bridges on primary roads designed by this Department, by whitewashing the interior and the addition of open windows at panel points. These are provided with returns, and with the asphaltic wearing surface on the floors of such bridges prevent moisture coming in contact with the structural timbers of the bridge.
This bridge was built by the Portland Bridge Company and the total cost will be about $25,000.00. The payments on the bridge to November 30, 1918, amounted to $21,051.52. Mr. Leigh M. Huggins was resident engineer in charge of construction.
Big Creek Bridge
This bridge is located on the Columbia River Highway near Knappa. It consists of two forty-five-foot reinforced concrete spans, and was built by the State Highway Department with State forces at a cost of $8,446.70.
Plympton Creek Bridge
The Plympton Creek Bridge is located on the Columbia River Highway in the town of Westport. It is a two thirty-foot span structure and was built by the State Highway Department with State forces at a cost of $6,413.19.
Little Creek Culvert
This is a 6 by 12 reinforced concrete structure and is located on the Columbia River Highway near Knappa. It was built by the Highway Department with State forces at a cost of $929.69.