US Bridges

Linwood Ave over Johnson Creek

Fair

Clackamas County, Oregon · 0.07 MI S of John CR Blvd · Structure no. 06546 149 00161

Built
1938
87 years old, rebuilt 1953
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
64 ft
2 main spans
Daily traffic
7,673
2020 count
Owner
County
County Highway Agency

About this bridge

Linwood Ave over Johnson Creek is a steel continuous stringer/multi-beam or girder carrying Linwood Ave over Johnson Creek in Clackamas County, Oregon. It was built in 1938 and reconstructed in 1953, so it is 87 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 7,673 vehicles a day, roughly 7% of them trucks, projected to reach 7,783 by 2025. The structure is 64 ft (19.5 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLinwood Ave
CrossesJohnson Creek
Location0.07 MI S of John CR Blvd
RouteCounty Highway 9727
CountyClackamas County
StateOregon
Coordinates45.45473, -122.59899
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span34 ft (10.4 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,673 (2020)
Projected traffic7,783 by 2025
Trucks7%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$328,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Linwood Ave over Johnson Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1953.

What condition is Linwood Ave over Johnson 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 May 2023.

How much traffic does Linwood Ave over Johnson Creek carry?

About 7,673 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is Linwood Ave over Johnson Creek?

The structure is 64 ft (19.5 m) long with a longest span of 34 ft (10.4 m) and a deck 32 ft wide.

Who owns Linwood Ave over Johnson Creek?

It is owned by the County Highway Agency.