US Bridges

4th Ave in Canby over Mollala Forest Rail Road

Fair

Clackamas County, Oregon · 0.1 MI E JCT Redwood · Structure no. 21712 000 00000

Built
1950
75 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
130
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

4th Ave in Canby over Mollala Forest Rail Road is a prestressed concrete slab carrying 4th Ave in Canby over Mollala Forest Rail Road in Clackamas County, Oregon. It was built in 1950, so it is 75 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 130 vehicles a day, roughly 1% of them trucks, projected to reach 145 by 2025. The structure is 71 ft (21.6 m) long and 54 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
Carries4th Ave in Canby
CrossesMollala Forest Rail Road
Location0.1 MI E JCT Redwood
RouteCity Street 0
CountyClackamas County
StateOregon
Coordinates45.26146, -122.67308
Functional classUrban Collector

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length71 ft (21.6 m)
Longest span69 ft (21 m)
Deck width54 ft (16.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2020)
Projected traffic145 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$359,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was 4th Ave in Canby over Mollala Forest Rail Road built?

It was built in 1950, making it 75 years old in 2025.

What condition is 4th Ave in Canby over Mollala Forest Rail Road 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 April 2023.

How much traffic does 4th Ave in Canby over Mollala Forest Rail Road carry?

About 130 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is 4th Ave in Canby over Mollala Forest Rail Road?

The structure is 71 ft (21.6 m) long with a longest span of 69 ft (21 m) and a deck 54 ft wide.

Who owns 4th Ave in Canby over Mollala Forest Rail Road?

It is owned by the City or Municipal Highway Agency.