US Bridges

Or 99E (hwy 81) over Willamette River

Fair

Clackamas County, Oregon · In Oregon City · Structure no. 02374 01E 01229

Built
1940
85 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete Continuous
Length
372 ft
8 main spans
Daily traffic
19,211
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99E (hwy 81) over Willamette River is a concrete continuous tee beam carrying Or 99E (hwy 81) over Willamette River in Clackamas County, Oregon. It was built in 1940, so it is 85 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 19,211 vehicles a day, roughly 1% of them trucks, projected to reach 25,000 by 2042. The structure is 372 ft (113.3 m) long and 62 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesOr 99E (hwy 81)
CrossesWillamette River
LocationIn Oregon City
RouteState Highway 99
CountyClackamas County
StateOregon
Coordinates45.35919, -122.60753
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.7 US tons
Inventory rating16.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length372 ft (113.3 m)
Longest span70 ft (21.3 m)
Deck width62 ft (18.8 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,211 (2022)
Projected traffic25,000 by 2042
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.9 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 99E (hwy 81) over Willamette River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Or 99E (hwy 81) over Willamette 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 November 2024.

How much traffic does Or 99E (hwy 81) over Willamette River carry?

About 19,211 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Or 99E (hwy 81) over Willamette River?

The structure is 372 ft (113.3 m) long with a longest span of 70 ft (21.3 m) and a deck 62 ft wide.

Who owns Or 99E (hwy 81) over Willamette River?

It is owned by the State Highway Agency.