Page Index

• Shepperd's Dell Bridge: HAER Report

Robert W. Hadlow, Columbia River Highway Historic District, National Historic Landmark Nomination

CS7. Structure: Shepperd’s Dell Bridge, No. 4528 HAER No. OR-23

Location: HMP 27.4

Date: 1914

Designer: K. P. Billner, Oregon State Highway Dept.

Builder: Pacific Bridge Company, Portland

Owner: Oregon Department of Transportation

This bridge consists of a single 100-foot, open spandrel, reinforced-concrete ribbed deck arch. Total length with approaches is 150 feet. It has a 17-foot-wide roadway, two sidewalks, and spindle-and-cap railings. A staircase at the eastern end leads down to a masonry-walled pedestrian trail that takes visitors to the stream. A bronze plaque on the southeast masonry railing end post reads:

SHEPPERD’S DELL

Presented to the

City of Portland

by George Shepperd

May 6th 1915

"The Shepperd's Dell bridge is 135 above the stream, which is spanned with a reinforced concrete arch 100 feet in length, the total length from end to end being 150 feet."

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BridgeHunter.com: Shepperds Dell Bridge

Overview: Concrete arch bridge over Shepperds Dell on Historical Columbia River Highway

Location: Multnomah County, Oregon

Status: Open to traffic

History: Built 1914

Builders

- Charles H. Purcell (Bridge Engineer)

- Karl P. Billner (Design Engineer)

- Pacific Bridge Co. of Portland, Oregon (Prime Contractor)

- The Construction Co. (Sub-Contractor)

Design: Open-spandrel concrete arch

Dimensions

Length of largest span: 100.0 ft.

Total length: 149.9 ft.

Deck width: 16.9 ft.

Also called: Youngs Creek Bridge

Average daily traffic (as of 2016): 1,300

Inventory numbers

OR 04528 (Oregon Dept. of Transportation structure number)

BH 30115 (Bridgehunter.com ID)

BridgeReports.com: HWY 100 over SHEPPERDS DELL

Latest Available Inspection: September 2017

Good/Fair/Poor Condition: Fair

Status: Open, no restriction [A]

Average daily traffic: 1,300 [as of 2016]

Truck traffic: 3% of total traffic

Deck condition: Satisfactory [6 out of 9]

Superstructure condition: Fair [5 out of 9]

Substructure condition: Satisfactory [6 out of 9]

Structural appraisal: Basically intolerable requiring high priority of corrrective action [3]

Deck geometry appraisal: Basically intolerable requiring high priority of replacement [2]

Water adequacy appraisal: Equal to present desirable criteria [8]

Roadway alignment appraisal: Equal to present minimum criteria [6]

Channel protection: Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]

Pier/abutment protection: Navigation protection not required [1]

Scour condition: Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]

Sufficiency rating: 30.8

Recommended work: Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]

Estimated cost of work: $769,000

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