US Bridges

HWY 160 over Molalla River

Fair

Clackamas County, Oregon · 1.5 MI S Mulino · Structure no. 01352A160 01244

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
542 ft
6 main spans
Daily traffic
14,731
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 160 over Molalla River is a prestressed concrete continuous stringer/multi-beam or girder carrying HWY 160 over Molalla River in Clackamas County, Oregon. It was built in 1975, so it is 50 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 14,731 vehicles a day, roughly 10% of them trucks, projected to reach 16,600 by 2042. The structure is 542 ft (165.2 m) long and 56 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

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CarriesHWY 160
CrossesMolalla River
Location1.5 MI S Mulino
RouteState Highway 213
CountyClackamas County
StateOregon
Coordinates45.2, -122.581
Functional classRural Minor 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
Deck7 GoodSome minor problems.
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length542 ft (165.2 m)
Longest span120 ft (36.6 m)
Deck width56 ft (17 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,731 (2022)
Projected traffic16,600 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 160 over Molalla River built?

It was built in 1975, making it 50 years old in 2025.

What condition is HWY 160 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 June 2023.

How much traffic does HWY 160 over Molalla River carry?

About 14,731 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is HWY 160 over Molalla River?

The structure is 542 ft (165.2 m) long with a longest span of 120 ft (36.6 m) and a deck 56 ft wide.

Who owns HWY 160 over Molalla River?

It is owned by the State Highway Agency.