US Bridges

Skidmore ST over HWY 001 (I-5)

Fair

Multnomah County, Oregon · 24 MI N of Burnside Br · Structure no. 09012 001 30388

Built
1964
61 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
487 ft
7 main spans
Daily traffic
107,945
2020 count
Owner
State
State Highway Agency

About this bridge

Skidmore ST over HWY 001 (I-5) is a concrete continuous box beam or girders - multiple carrying Skidmore ST over HWY 001 (I-5) in Multnomah County, Oregon. It was built in 1964, so it is 61 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 107,945 vehicles a day, roughly 15% of them trucks, projected to reach 141,800 by 2040. The structure is 487 ft (148.4 m) long and 60 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesSkidmore ST
CrossesHWY 001 (I-5)
Location24 MI N of Burnside Br
RouteCity Street 0
CountyMultnomah County
StateOregon
Coordinates45.55464, -122.67826
Functional classUrban Collector

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 inspectionDecember 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length487 ft (148.4 m)
Longest span88 ft (26.9 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic107,945 (2020)
Projected traffic141,800 by 2040
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.7 mi (14 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 Skidmore ST over HWY 001 (I-5) built?

It was built in 1964, making it 61 years old in 2025.

What condition is Skidmore ST over HWY 001 (I-5) 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 December 2024.

How much traffic does Skidmore ST over HWY 001 (I-5) carry?

About 107,945 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Skidmore ST over HWY 001 (I-5)?

The structure is 487 ft (148.4 m) long with a longest span of 88 ft (26.9 m) and a deck 60 ft wide.

Who owns Skidmore ST over HWY 001 (I-5)?

It is owned by the State Highway Agency.