US Bridges

HWY 081 NB over Molalla River

Fair

Clackamas County, Oregon · In Canby · Structure no. 02061 01E 02203

Built
1936
89 years old
Condition
Fair
inspected November 2024
Type
Truss - Deck
Steel
Length
600 ft
3 main spans
Daily traffic
11,423
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 081 NB over Molalla River is a steel truss - deck carrying HWY 081 NB over Molalla River in Clackamas County, Oregon. It was built in 1936, so it is 89 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 11,423 vehicles a day, roughly 4% of them trucks, projected to reach 14,400 by 2042. The structure is 600 ft (182.8 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesHWY 081 NB
CrossesMolalla River
LocationIn Canby
RouteState Highway 99
CountyClackamas County
StateOregon
Coordinates45.2555, -122.7074
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+9 approach)
Design loadH 15
Structure length600 ft (182.8 m)
Longest span81 ft (24.8 m)
Deck width35 ft (10.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,423 (2022)
Projected traffic14,400 by 2042
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 081 NB over Molalla River built?

It was built in 1936, making it 89 years old in 2025.

What condition is HWY 081 NB over Molalla 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 HWY 081 NB over Molalla River carry?

About 11,423 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is HWY 081 NB over Molalla River?

The structure is 600 ft (182.8 m) long with a longest span of 81 ft (24.8 m) and a deck 35 ft wide.

Who owns HWY 081 NB over Molalla River?

It is owned by the State Highway Agency.