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Whiteson Dip Bridge


Whiteson Dip Bridge

Side elevation - from the southeast.

Photo taken by Mike Goff in March 2018


BH Photo #444071

Street View 


The Whiteson Dip Bridge is a unique structure in the sense that in the design it both marks the end of one bridge building era and the beginning of another.

Being built in 1956 with a large timber trestle substructure, the bridge was a relatively late use of timber construction on a major highway route. The center portion of the structure features a framed timber trestle that measures over 40-feet tall. The timber trestle design made for a inexpensive structure to cross the nearly 300-foot wide ravine over the Whiteson Dip.

The concrete superstructure on the bridge while standard for the era, also marked an important step in engineering advancements. The girders were pre-cast and then placed on the substructure. Once the girders were placed the deck and rails could be constructed. This method of construction was a precursor to the Interstate Era that would dawn shortly after the Whiteson Dip Bridge was completed.


Concrete deck girder bridge over Whiteson Dip on OR-99W
Yamhill County, Oregon
Open to traffic
Built 1956
Concrete deck girder supported by timber trestle
Length of largest span: 24.9 ft.
Total length: 274.9 ft.
Deck width: 29.9 ft.
Approximate latitude, longitude
+45.14947, -123.19740   (decimal degrees)
45°08'58" N, 123°11'51" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/484482/4999574 (zone/easting/northing)
Average daily traffic (as of 2017)
Inventory numbers
OR 08208 (Oregon Dept. of Transportation structure number)
BH 84567 (Bridgehunter.com ID)
Inspection report (as of March 2018)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 80 (out of 100)
View more at BridgeReports.com


Built 1956 (335)
Built during 1950s (4,058)
Concrete girder (1,090)
Continuous (2,674)
Deck girder (6,464)
Girder (11,439)
Have street view (30,051)
OR 99 (26)
OR 99W (9)
Open (41,258)
Oregon (1,276)
Owned by state (16,705)
Span length under 25 feet (7,141)
Timber Trestle (67)
Total length 250-500 feet (5,643)
US 99 (76)
Yamhill County, Oregon (29)

Update Log 

  • April 4, 2019: New photos from Mike Goff
  • February 27, 2019: New photos from Mike Goff


  • Mike Goff - michael [dot] goff [at] hotmail [dot] com


Whiteson Dip Bridge
Posted March 1, 2019, by Tony Dillon (spansaver [at] hotmail [dot] com)

Could this be the only bridge to officially span a "Dip"? ;-p

Whiteson Dip Bridge
Posted March 1, 2019, by Mike Goff (michael [dot] goff [at] hotmail [dot] com)


You are correct, that stretch of highway was built in the mid to late 1940's during a realignment of the Pacific Highway. Many of the overflow structures around the Santiam River were timber pile supported bridges.

The interesting part about the Whiteson Dip structure, at least to me, is that it roughly dates to the same time period in which I-5 was being constructed in the Santiam River area as you described. However, it was when the concrete bridges were being constructed and not the earlier timber structures.

The choice for such a large timber structure to be placed on a state highway at such a late date is quite an interesting one to me.

On a side note, we still have well over 200 bridges with timber members sprinkled throughout the state highway system in Western Oregon, with even more on the local roads. Timber, though not necessarily king anymore is still holding strong as a bridge material (at least when it is maintained).

Have a good day,


Whiteson Dip Bridge
Posted March 1, 2019, by Scott Gavin (trainnut1956 [at] gmail [dot] com)

On the southbound lanes of I-5, between Salem and Eugene, there were several bridges of this type with wooden trestle underpinnings and concrete decks and rails. The northbound lanes, which I presume were built later, were concrete above and below. I believe those timber bridges were all replaced in the 1990s.