US Bridges

HWY 161 over Canyon Crk

Fair

Clackamas County, Oregon · 8.8 MI NE of Molalla · Structure no. 01608A161 02154

Built
1932
93 years old, rebuilt 1972
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
106 ft
3 main spans
Daily traffic
3,276
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 161 over Canyon Crk is a prestressed concrete slab carrying HWY 161 over Canyon Crk in Clackamas County, Oregon. It was built in 1932 and reconstructed in 1972, so it is 93 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 3,276 vehicles a day, roughly 19% of them trucks, projected to reach 4,300 by 2042. The structure is 106 ft (32.3 m) long and 49 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesHWY 161
CrossesCanyon Crk
Location8.8 MI NE of Molalla
RouteState Highway 211
CountyClackamas County
StateOregon
Coordinates45.1723, -122.43021
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.8 US tons
Inventory rating12.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length106 ft (32.3 m)
Longest span48 ft (14.6 m)
Deck width49 ft (14.9 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,276 (2022)
Projected traffic4,300 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 161 over Canyon Crk built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1972.

What condition is HWY 161 over Canyon Crk 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 161 over Canyon Crk carry?

About 3,276 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is HWY 161 over Canyon Crk?

The structure is 106 ft (32.3 m) long with a longest span of 48 ft (14.6 m) and a deck 49 ft wide.

Who owns HWY 161 over Canyon Crk?

It is owned by the State Highway Agency.