US Bridges

Or 224 (hwy 171) over Clack River (armstrong)

Fair

Clackamas County, Oregon · 15.7 MI SE Estacada · Structure no. 08989 171 03915

Built
1954
71 years old
Condition
Fair
inspected August 2023
Type
Truss - Thru
Steel
Length
427 ft
1 main span
Daily traffic
337
2022 count
Owner
State
State Highway Agency

About this bridge

Or 224 (hwy 171) over Clack River (armstrong) is a steel truss - thru carrying Or 224 (hwy 171) over Clack River (armstrong) in Clackamas County, Oregon. It was built in 1954, so it is 71 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 337 vehicles a day, roughly 22% of them trucks, projected to reach 350 by 2042. The structure is 427 ft (130 m) long and 29 ft wide. If it were closed, the detour would be 52.8 mi (85 km).

Location

Open in Google Maps
CarriesOr 224 (hwy 171)
CrossesClack River (armstrong)
Location15.7 MI SE Estacada
RouteState Highway 224
CountyClackamas County
StateOregon
Coordinates45.16221, -122.15133
Functional classRural Major 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 protection8 Very GoodNo problems noted.
Last inspectionAugust 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 rating30.3 US tons
Inventory rating23.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadH 20
Structure length427 ft (130 m)
Longest span240 ft (73.2 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic337 (2022)
Projected traffic350 by 2042
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.8 mi (85 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 224 (hwy 171) over Clack River (armstrong) built?

It was built in 1954, making it 71 years old in 2025.

What condition is Or 224 (hwy 171) over Clack River (armstrong) 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 August 2023.

How much traffic does Or 224 (hwy 171) over Clack River (armstrong) carry?

About 337 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is Or 224 (hwy 171) over Clack River (armstrong)?

The structure is 427 ft (130 m) long with a longest span of 240 ft (73.2 m) and a deck 29 ft wide.

Who owns Or 224 (hwy 171) over Clack River (armstrong)?

It is owned by the State Highway Agency.