Architect and engineer . nd one 28-foot approach span;and 1800 feet of wooden approach also requires 600 lineal feet of concretepaving on the Longview end and three-fourths mile of paving on the south end. The roadway is 27 feet wide; there aretwo 3-foot sidewalks. The bridge is de-signed for two twenty-ton trucks passingabreast and for standard specifications ofthe American Association of State High- June. There are four principal piers, fiveminor piers, and two sets of pedestals onthe north bank. Elevations for the bridge are referred tothe U. S. Engineers datum at Slaug
Architect and engineer . nd one 28-foot approach span;and 1800 feet of wooden approach also requires 600 lineal feet of concretepaving on the Longview end and three-fourths mile of paving on the south end. The roadway is 27 feet wide; there aretwo 3-foot sidewalks. The bridge is de-signed for two twenty-ton trucks passingabreast and for standard specifications ofthe American Association of State High- June. There are four principal piers, fiveminor piers, and two sets of pedestals onthe north bank. Elevations for the bridge are referred tothe U. S. Engineers datum at Slaughterbar on Columbia River. Mean low wateris at plus 2 feet with a main channel depthof 37 feet; the highwater elevation is plus27 feet. The river-bed elevation ranges fromminus 30 to minus 35 feet. Pier foundationsare in a gravel and boulder stratum whichslopes regularly from minus 25 feet underpier 7, near the Rainier side, to minus 84feet under pier 1 on the Longview side. Thedistance from river bed to pier foundations. COLUMBIA RIVER LUNItN lEW BRBethlehem Steel Com way Officials. The main trusses are de-signed for 60 pounds per square foot ofroadway and for forty pounds per squarefoot of sidewalk. Secondary stresses werefigured throughout. Carbon and siliconsteel members were employed; the siliconbeing used where enough weight is saved topay for its added cost. The substructure was begun in October,1928, and was completed the following U)t,E, lUlLT AI CU^r OF $5,800,000pany, Steel Fabricators varies from 20 to 38 feet. Pedestals A and B, C and D, are spaced40 feet on centers, and carry a steel toweron which are joined the wooden approachtrestle from Longview and 168-foot ap-proach span. Pier 1, which supports one end of thenorth anchor span, rests on a cluster of 216timber piles with cut-off at elevation minus48 feet. The pier was built with a timber 94 AflCHlTECT AND ENGINEER, April, 1930 crib which extended from elevation minus50 feet to the top of pedestals at elevationp
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