US Bridges

HWY 3 SB over Oswego Creek

Fair

Clackamas County, Oregon · 1.0 M S of Terwilliger Bv · Structure no. 00409 003 00676

Built
1930
95 years old
Condition
Fair
inspected December 2023
Type
Arch - Deck
Concrete
Length
330 ft
1 main span
Daily traffic
8,805
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 3 SB over Oswego Creek is a concrete arch - deck carrying HWY 3 SB over Oswego Creek in Clackamas County, Oregon. It was built in 1930, so it is 95 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 8,805 vehicles a day, roughly 1% of them trucks, projected to reach 9,700 by 2042. The structure is 330 ft (100.7 m) long and 22 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY 3 SB
CrossesOswego Creek
Location1.0 M S of Terwilliger Bv
RouteState Highway 43
CountyClackamas County
StateOregon
Coordinates45.41035, -122.66407
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.5 US tons
Inventory rating17.5 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadH 15
Structure length330 ft (100.7 m)
Longest span130 ft (39.6 m)
Deck width22 ft (6.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,805 (2022)
Projected traffic9,700 by 2042
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 3 SB over Oswego Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is HWY 3 SB over Oswego Creek 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 2023.

How much traffic does HWY 3 SB over Oswego Creek carry?

About 8,805 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is HWY 3 SB over Oswego Creek?

The structure is 330 ft (100.7 m) long with a longest span of 130 ft (39.6 m) and a deck 22 ft wide.

Who owns HWY 3 SB over Oswego Creek?

It is owned by the State Highway Agency.