US Bridges

Road over Clackamas River

Fair

Clackamas County, Oregon · S-01 T-8S R-7E Wm · Structure no. 060603000001444

Built
1964
61 years old
Condition
Fair
inspected October 2023
Type
Frame
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
270
2006 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over Clackamas River is a concrete continuous frame carrying Road over Clackamas River in Clackamas County, Oregon. It was built in 1964, so it is 61 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 270 vehicles a day, roughly 15% of them trucks, projected to reach 405 by 2045. The structure is 90 ft (27.4 m) long and 31 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesRoad
CrossesClackamas River
LocationS-01 T-8S R-7E Wm
RouteFederal Lands Road 46000
CountyClackamas County
StateOregon
Coordinates44.90433, -121.89094
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating31 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length90 ft (27.4 m)
Longest span60 ft (18.3 m)
Deck width31 ft (9.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2006)
Projected traffic405 by 2045
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road over Clackamas River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Road over Clackamas 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 October 2023.

How much traffic does Road over Clackamas River carry?

About 270 vehicles per day (2006 count), of which roughly 15% are trucks.

How long is Road over Clackamas River?

The structure is 90 ft (27.4 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.

Who owns Road over Clackamas River?

It is owned by the U.S. Forest Service.