US Bridges

Tigard Street over Fanno Creek

Poor

Washington County, Oregon · 0005 West of Tiedeman · Structure no. 67T002000000000

Built
1958
67 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
63 ft
4 main spans
Daily traffic
5,667
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tigard Street over Fanno Creek is a wood or timber stringer/multi-beam or girder carrying Tigard Street over Fanno Creek in Washington County, Oregon. It was built in 1958, so it is 67 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 5,667 vehicles a day, roughly 5% of them trucks, projected to reach 6,250 by 2025. The structure is 63 ft (19.2 m) long and 29 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesTigard Street
CrossesFanno Creek
Location0005 West of Tiedeman
RouteCity Street C0000
StateOregon
Coordinates45.43627, -122.7843
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 20
Structure length63 ft (19.2 m)
Longest span15 ft (4.6 m)
Deck width29 ft (8.8 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,667 (2020)
Projected traffic6,250 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$323,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Tigard Street over Fanno Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is Tigard Street over Fanno Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Tigard Street over Fanno Creek carry?

About 5,667 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Tigard Street over Fanno Creek?

The structure is 63 ft (19.2 m) long with a longest span of 15 ft (4.6 m) and a deck 29 ft wide.

Who owns Tigard Street over Fanno Creek?

It is owned by the City or Municipal Highway Agency.