US Bridges

1C from NB I-5 over SW Terwilliger Blvd.

Fair

Multnomah County, Oregon · 1.7 M S of Ross Isl. Br. · Structure no. 08392D001C29709

Built
1993
32 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
290 ft
3 main spans
Daily traffic
6,649
2022 count
Owner
State
State Highway Agency

About this bridge

1C from NB I-5 over SW Terwilliger Blvd. is a concrete continuous box beam or girders - multiple carrying 1C from NB I-5 over SW Terwilliger Blvd. 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 5 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 6,649 vehicles a day, roughly 10% of them trucks, projected to reach 77,500 by 2040. The structure is 290 ft (88.4 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries1C from NB I-5
CrossesSW Terwilliger Blvd.
Location1.7 M S of Ross Isl. Br.
RouteInterstate 5
CountyMultnomah County
StateOregon
Coordinates45.4698, -122.68627
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating19.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length290 ft (88.4 m)
Longest span130 ft (39.6 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,649 (2022)
Projected traffic77,500 by 2040
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed3.1 mi (5 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 1C from NB I-5 over SW Terwilliger Blvd. built?

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

What condition is 1C from NB I-5 over SW Terwilliger Blvd. 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 1C from NB I-5 over SW Terwilliger Blvd. carry?

About 6,649 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is 1C from NB I-5 over SW Terwilliger Blvd.?

The structure is 290 ft (88.4 m) long with a longest span of 130 ft (39.6 m) and a deck 37 ft wide.

Who owns 1C from NB I-5 over SW Terwilliger Blvd.?

It is owned by the State Highway Agency.