US Bridges

Or 99E (hwy 81) over Partial Viaduct

Fair

Clackamas County, Oregon · In Oregon City · Structure no. 02732 01E 01222

Built
1940
85 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete Continuous
Length
336 ft
11 main spans
Daily traffic
19,677
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99E (hwy 81) over Partial Viaduct is a concrete continuous tee beam carrying Or 99E (hwy 81) over Partial Viaduct 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 5 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 19,677 vehicles a day, roughly 1% of them trucks, projected to reach 25,600 by 2042. The structure is 336 ft (102.4 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesOr 99E (hwy 81)
CrossesPartial Viaduct
LocationIn Oregon City
RouteState Highway 99
CountyClackamas County
StateOregon
Coordinates45.35968, -122.60654
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.4 US tons
Inventory rating15.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadH 15
Structure length336 ft (102.4 m)
Longest span33 ft (10.1 m)
Deck width16 ft (5 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,677 (2022)
Projected traffic25,600 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$1.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 99E (hwy 81) over Partial Viaduct built?

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

What condition is Or 99E (hwy 81) over Partial Viaduct 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 Partial Viaduct carry?

About 19,677 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Or 99E (hwy 81) over Partial Viaduct?

The structure is 336 ft (102.4 m) long with a longest span of 33 ft (10.1 m) and a deck 16 ft wide.

Who owns Or 99E (hwy 81) over Partial Viaduct?

It is owned by the State Highway Agency.