US Bridges

SE 55th Avenue over Johnson Creek

Fair

Clackamas County, Oregon · 00.2 MI S of John CR Blvd · Structure no. 06556 000 00019

Built
1955
70 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
51 ft
2 main spans
Daily traffic
982
2020 count
Owner
County
County Highway Agency

About this bridge

SE 55th Avenue over Johnson Creek is a steel continuous stringer/multi-beam or girder carrying SE 55th Avenue over Johnson Creek in Clackamas County, Oregon. It was built in 1955, so it is 70 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 982 vehicles a day, roughly 5% of them trucks, projected to reach 1,083 by 2025. The structure is 51 ft (15.5 m) long and 30 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSE 55th Avenue
CrossesJohnson Creek
Location00.2 MI S of John CR Blvd
RouteCounty Highway C1283
CountyClackamas County
StateOregon
Coordinates45.45714, -122.60736
Functional classUrban Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating28.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length51 ft (15.5 m)
Longest span27 ft (8.2 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic982 (2020)
Projected traffic1,083 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 55th Avenue over Johnson Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is SE 55th Avenue 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 SE 55th Avenue over Johnson Creek carry?

About 982 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SE 55th Avenue over Johnson Creek?

The structure is 51 ft (15.5 m) long with a longest span of 27 ft (8.2 m) and a deck 30 ft wide.

Who owns SE 55th Avenue over Johnson Creek?

It is owned by the County Highway Agency.