US Bridges

South Shore Blvd over Oswego Lake

Fair

Clackamas County, Oregon · 2 MI S of Lakeview Blvd · Structure no. 06072 220 00020

Built
1934
91 years old, rebuilt 1955
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
3 main spans
Daily traffic
9,661
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

South Shore Blvd over Oswego Lake is a steel stringer/multi-beam or girder carrying South Shore Blvd over Oswego Lake in Clackamas County, Oregon. It was built in 1934 and reconstructed in 1955, so it is 91 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 9,661 vehicles a day, roughly 10% of them trucks, projected to reach 10,411 by 2025. The structure is 65 ft (19.8 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSouth Shore Blvd
CrossesOswego Lake
Location2 MI S of Lakeview Blvd
RouteCounty Highway 9527
CountyClackamas County
StateOregon
Coordinates45.40385, -122.718
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length65 ft (19.8 m)
Longest span29 ft (8.8 m)
Deck width29 ft (8.9 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,661 (2020)
Projected traffic10,411 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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$323,000
NavigationNo navigation control on waterway

Frequently asked questions

When was South Shore Blvd over Oswego Lake built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1955.

What condition is South Shore Blvd over Oswego Lake 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 May 2023.

How much traffic does South Shore Blvd over Oswego Lake carry?

About 9,661 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is South Shore Blvd over Oswego Lake?

The structure is 65 ft (19.8 m) long with a longest span of 29 ft (8.8 m) and a deck 29 ft wide.

Who owns South Shore Blvd over Oswego Lake?

It is owned by the City or Municipal Highway Agency.