US Bridges

170th Ave over Beaverton Creek

FairPosted for load

Washington County, Oregon · 0055 MI N HWY-8 · Structure no. 671333113500080

Built
1969
56 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
50 ft
2 main spans
Daily traffic
18,596
2020 count
Owner
County
County Highway Agency

About this bridge

170th Ave over Beaverton Creek is a prestressed concrete slab carrying 170th Ave over Beaverton Creek in Washington County, Oregon. It was built in 1969, so it is 56 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 18,596 vehicles a day, roughly 5% of them trucks, projected to reach 20,509 by 2025. The structure is 50 ft (15.2 m) long and 33 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

Open in Google Maps
Carries170th Ave
CrossesBeaverton Creek
Location0055 MI N HWY-8
RouteCounty Highway C0955
CountyWashington County
StateOregon
Coordinates45.50079, -122.85199
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating19.3 US tons
Inventory rating15 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,596 (2020)
Projected traffic20,509 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$256,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 170th Ave over Beaverton Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is 170th Ave over Beaverton Creek 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 September 2024.

How much traffic does 170th Ave over Beaverton Creek carry?

About 18,596 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 170th Ave over Beaverton Creek?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns 170th Ave over Beaverton Creek?

It is owned by the County Highway Agency.