US Bridges

Dersham RD over HWY 47 US 26

Fair

Washington County, Oregon · 19.3 MI W of Portland Cc · Structure no. 06519A047 05519

Built
1971
54 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
262 ft
2 main spans
Daily traffic
8,000
2010 count
Owner
State
State Highway Agency

About this bridge

Dersham RD over HWY 47 US 26 is a prestressed concrete continuous stringer/multi-beam or girder carrying Dersham RD over HWY 47 US 26 in Washington County, Oregon. It was built in 1971, so it is 54 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 8,000 vehicles a day, roughly 1% of them trucks, projected to reach 8,100 by 2030. The structure is 262 ft (79.9 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesDersham RD
CrossesHWY 47 US 26
Location19.3 MI W of Portland Cc
RouteCounty Highway 0
CountyWashington County
StateOregon
Coordinates45.604, -123.03276
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.5 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length262 ft (79.9 m)
Longest span109 ft (33.2 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2010)
Projected traffic8,100 by 2030
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Dersham RD over HWY 47 US 26 built?

It was built in 1971, making it 54 years old in 2025.

What condition is Dersham RD over HWY 47 US 26 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Dersham RD over HWY 47 US 26 carry?

About 8,000 vehicles per day (2010 count), of which roughly 1% are trucks.

How long is Dersham RD over HWY 47 US 26?

The structure is 262 ft (79.9 m) long with a longest span of 109 ft (33.2 m) and a deck 34 ft wide.

Who owns Dersham RD over HWY 47 US 26?

It is owned by the State Highway Agency.