US Bridges

Petes Mountain RD over Tualatin River

Fair

Clackamas County, Oregon · 0.2 MI from Willamette R. · Structure no. 01654A003 00354

Built
1977
48 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
394 ft
3 main spans
Daily traffic
2,060
2020 count
Owner
County
County Highway Agency

About this bridge

Petes Mountain RD over Tualatin River is a prestressed concrete stringer/multi-beam or girder carrying Petes Mountain RD over Tualatin River in Clackamas County, Oregon. It was built in 1977, so it is 48 years old, younger 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 2,060 vehicles a day, roughly 14% of them trucks, projected to reach 2,090 by 2025. The structure is 394 ft (120.1 m) long and 41 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesPetes Mountain RD
CrossesTualatin River
Location0.2 MI from Willamette R.
RouteCounty Highway 9585
CountyClackamas County
StateOregon
Coordinates45.33951, -122.65468
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length394 ft (120.1 m)
Longest span130 ft (39.6 m)
Deck width41 ft (12.5 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,060 (2020)
Projected traffic2,090 by 2025
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Petes Mountain RD over Tualatin River built?

It was built in 1977, making it 48 years old in 2025.

What condition is Petes Mountain RD over Tualatin 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 May 2023.

How much traffic does Petes Mountain RD over Tualatin River carry?

About 2,060 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is Petes Mountain RD over Tualatin River?

The structure is 394 ft (120.1 m) long with a longest span of 130 ft (39.6 m) and a deck 41 ft wide.

Who owns Petes Mountain RD over Tualatin River?

It is owned by the County Highway Agency.