US Bridges

Or 211 (hwy 161) over Rock Creek

Fair

Clackamas County, Oregon · 055 M W of Woodburn · Structure no. 01802C161 00550

Built
1986
39 years old
Condition
Fair
inspected July 2023
Type
Slab
Prestressed Concrete
Length
130 ft
3 main spans
Daily traffic
5,304
2022 count
Owner
State
State Highway Agency

About this bridge

Or 211 (hwy 161) over Rock Creek is a prestressed concrete slab carrying Or 211 (hwy 161) over Rock Creek in Clackamas County, Oregon. It was built in 1986, so it is 39 years old, younger 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 5,304 vehicles a day, roughly 14% of them trucks, projected to reach 6,400 by 2042. The structure is 130 ft (39.6 m) long and 44 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesOr 211 (hwy 161)
CrossesRock Creek
Location055 M W of Woodburn
RouteState Highway 211
CountyClackamas County
StateOregon
Coordinates45.14496, -122.72246
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 25 or greater
Structure length130 ft (39.6 m)
Longest span50 ft (15.2 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,304 (2022)
Projected traffic6,400 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 211 (hwy 161) over Rock Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Or 211 (hwy 161) over Rock 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 July 2023.

How much traffic does Or 211 (hwy 161) over Rock Creek carry?

About 5,304 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Or 211 (hwy 161) over Rock Creek?

The structure is 130 ft (39.6 m) long with a longest span of 50 ft (15.2 m) and a deck 44 ft wide.

Who owns Or 211 (hwy 161) over Rock Creek?

It is owned by the State Highway Agency.