US Bridges

Arndt Road over Pudding River

Fair

Clackamas County, Oregon · 00.3 MI W of Knights Br R · Structure no. 06521A000 00117

Built
1979
46 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
181 ft
1 main span
Daily traffic
14,416
2020 count
Owner
County
County Highway Agency

About this bridge

Arndt Road over Pudding River is a prestressed concrete stringer/multi-beam or girder carrying Arndt Road over Pudding River in Clackamas County, Oregon. It was built in 1979, so it is 46 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 14,416 vehicles a day, roughly 12% of them trucks, projected to reach 15,899 by 2025. The structure is 181 ft (55.2 m) long and 45 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesArndt Road
CrossesPudding River
Location00.3 MI W of Knights Br R
RouteCounty Highway 0A616
CountyClackamas County
StateOregon
Coordinates45.25954, -122.73894
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.
Superstructure7 GoodSome minor problems.
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 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 rating51 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+1 approach)
Design loadHS 20
Structure length181 ft (55.2 m)
Longest span116 ft (35.4 m)
Deck width45 ft (13.7 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,416 (2020)
Projected traffic15,899 by 2025
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Arndt Road over Pudding River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Arndt Road over Pudding River 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 Arndt Road over Pudding River carry?

About 14,416 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Arndt Road over Pudding River?

The structure is 181 ft (55.2 m) long with a longest span of 116 ft (35.4 m) and a deck 45 ft wide.

Who owns Arndt Road over Pudding River?

It is owned by the County Highway Agency.