US Bridges

Airport RD over Shelton Ditch

Fair

Marion County, Oregon · .25MI N. Mission ST · Structure no. 470445

Built
1954
71 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
8,475
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Airport RD over Shelton Ditch is a concrete continuous tee beam carrying Airport RD over Shelton Ditch in Marion County, Oregon. It was built in 1954, so it is 71 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 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 8,475 vehicles a day, roughly 5% of them trucks, projected to reach 9,225 by 2025. The structure is 85 ft (25.9 m) long and 31 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesAirport RD
CrossesShelton Ditch
Location.25MI N. Mission ST
RouteCity Street 0
CountyMarion County
StateOregon
Coordinates44.92501, -123.0039
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span52 ft (15.9 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,475 (2020)
Projected traffic9,225 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$435,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Airport RD over Shelton Ditch built?

It was built in 1954, making it 71 years old in 2025.

What condition is Airport RD over Shelton Ditch 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 August 2023.

How much traffic does Airport RD over Shelton Ditch carry?

About 8,475 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Airport RD over Shelton Ditch?

The structure is 85 ft (25.9 m) long with a longest span of 52 ft (15.9 m) and a deck 31 ft wide.

Who owns Airport RD over Shelton Ditch?

It is owned by the City or Municipal Highway Agency.