US Bridges

Terwilliger Blvd. over HWY 001

Fair

Multnomah County, Oregon · 1.7 M S of Ross Isl. Br. · Structure no. 08392C001C29717

Built
1993
32 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
687 ft
5 main spans
Daily traffic
113,008
2020 count
Owner
State
State Highway Agency

About this bridge

Terwilliger Blvd. over HWY 001 is a prestressed concrete continuous box beam or girders - multiple carrying Terwilliger Blvd. over HWY 001 in Multnomah County, Oregon. It was built in 1993, so it is 32 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 113,008 vehicles a day, roughly 11% of them trucks, projected to reach 155,000 by 2040. The structure is 687 ft (209.4 m) long and 62 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTerwilliger Blvd.
CrossesHWY 001
Location1.7 M S of Ross Isl. Br.
RouteCity Street 0
CountyMultnomah County
StateOregon
Coordinates45.4698, -122.68627
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length687 ft (209.4 m)
Longest span205 ft (62.5 m)
Deck width62 ft (18.8 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic113,008 (2020)
Projected traffic155,000 by 2040
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$7.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Terwilliger Blvd. over HWY 001 built?

It was built in 1993, making it 32 years old in 2025.

What condition is Terwilliger Blvd. over 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 January 2024.

How much traffic does Terwilliger Blvd. over HWY 001 carry?

About 113,008 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Terwilliger Blvd. over HWY 001?

The structure is 687 ft (209.4 m) long with a longest span of 205 ft (62.5 m) and a deck 62 ft wide.

Who owns Terwilliger Blvd. over HWY 001?

It is owned by the State Highway Agency.