Description
The Riverside Bridge project consists of replacing the existing bridge that spans the Skagit River, connecting the city of Mount Vernon to the city of Burlington. The new bridge will be a four-lane, 850-foot-long concrete girder bridge. It replaces the existing two-lane steel trestle bridge built in 1938.
The replacement structure has six piers, four of which are in the Skagit River. The piers are founded on 20 oscillated shafts, each 9 feet, 10 inches. Ranging from 84 to 95 feet in length each, 13 of these shafts are oscillated in the river. A 7-foot-diameter round column tops each shaft. Each of the piers in the river has a standard pier cap.
There are up to 10 girder lines that are almost 8 feet deep, and up to 186 feet long per span. The girders will be cast off-site. Three girder sections will be spliced and post-tensioned on-site, before erection. Next, these spliced "triples" will be erected and endure another phase of post-tensioning in the air.
On top of the girders, there will be a 27,500-square-foot conventional bridge deck.
Additional work includes demolition of the existing bridge, as well as improvements to the at-grade approaches and the new structure.
Contractor:
Kiewit Pacific Co., 215 V St., Vancouver, WA 98661, (360) 693-1478
Engineers:
Harding ESE Inc., 411 108th Ave. N.E., Suite 400, Bellevue, WA 98004, (425) 453-5545
GeoTest Services Inc., materials testing
Leonard, Boudinot, & Skodje, surveyor
Pharos Corp., right-of-way acquisition
Shannon & Wilson, geotechnical
West Consultants, hydraulic
Widener & Associates, environmental
Construction manager:
Washington State Department of Transportation, Mount Vernon office
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Other Participants
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Asphalt Services of Oregon Inc.
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Associated Sand & Gravel Co. Inc.
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Avar Construction Systems Inc.
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Chandler Construction Inc.
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CM Trucking & Construction Inc.
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Concrete Nor’West
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Concrete Technology Corp.
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Contech Construction Products
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Coral Sales Co.
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CSR Associated (CSR West LLC)
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DPK Inc.
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F-1 Enterprises
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Geo-Tech Exploration Inc.
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Gillis Walls Northwest Inc.
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Gloria Jeane Hauling & Highway Rehab Inc.
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Golder Associates
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Harvard Steel Inc.
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Hayward Baker Inc.
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Herman Hobbick
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Landel Corp.
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McCallum Rock Drilling Inc.
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Meridian Aggregates Co. LP
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Mettler Trucking
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Northwest Linings & Geotextile Products Inc.
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Northwest Logging
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Out West Landscape Inc.
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Pacific Surveying & Engineering Services Inc.
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Peterson Brothers Inc.
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RPM Inc.
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Sail Electric Inc.
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Schwetz Construction Inc.
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Sligar Construction Inc.
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Steve Sauer Trucking & Construction Inc.
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The Becker Co.
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The D.S. Brown Co.
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Van Zanter & Son LLC
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Western Refinery Services Inc.
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