US Bridges

HWY 1W NB to 1 NB over I-5 (hwy 001)

Fair

Washington County, Oregon · 1.3 MI N of Tigard Cc · Structure no. 07758D01WC00788

Built
1985
40 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
284 ft
2 main spans
Daily traffic
11,560
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 1W NB to 1 NB over I-5 (hwy 001) is a steel continuous stringer/multi-beam or girder carrying HWY 1W NB to 1 NB over I-5 (hwy 001) in Washington County, Oregon. It was built in 1985, so it is 40 years old, younger 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 11,560 vehicles a day, roughly 2% of them trucks, projected to reach 10,000 by 2030. The structure is 284 ft (86.6 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesHWY 1W NB to 1 NB
CrossesI-5 (hwy 001)
Location1.3 MI N of Tigard Cc
RouteState Highway 99
CountyWashington County
StateOregon
Coordinates45.44307, -122.7401
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 25 or greater
Structure length284 ft (86.6 m)
Longest span124 ft (37.8 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,560 (2022)
Projected traffic10,000 by 2030
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 HWY 1W NB to 1 NB over I-5 (hwy 001) built?

It was built in 1985, making it 40 years old in 2025.

What condition is HWY 1W NB to 1 NB over I-5 (hwy 001) 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 February 2024.

How much traffic does HWY 1W NB to 1 NB over I-5 (hwy 001) carry?

About 11,560 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is HWY 1W NB to 1 NB over I-5 (hwy 001)?

The structure is 284 ft (86.6 m) long with a longest span of 124 ft (37.8 m) and a deck 37 ft wide.

Who owns HWY 1W NB to 1 NB over I-5 (hwy 001)?

It is owned by the State Highway Agency.