US Bridges

HWY 029 over Dairy Creek

Fair

Washington County, Oregon · 2.9 MI E Forest Grove · Structure no. 00744B029 01431

Built
1923
102 years old, rebuilt 1956
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete Continuous
Length
330 ft
7 main spans
Daily traffic
28,179
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 029 over Dairy Creek is a concrete continuous tee beam carrying HWY 029 over Dairy Creek in Washington County, Oregon. It was built in 1923 and reconstructed in 1956, so it is 102 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.

It carries about 28,179 vehicles a day, roughly 3% of them trucks, projected to reach 40,800 by 2042. The structure is 330 ft (100.6 m) long and 68 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesHWY 029
CrossesDairy Creek
Location2.9 MI E Forest Grove
RouteState Highway 8
CountyWashington County
StateOregon
Coordinates45.52, -123.01086
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating20.7 US tons
Inventory rating16.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length330 ft (100.6 m)
Longest span50 ft (15.2 m)
Deck width68 ft (20.7 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,179 (2022)
Projected traffic40,800 by 2042
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 HWY 029 over Dairy Creek built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1956.

What condition is HWY 029 over Dairy 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 April 2024.

How much traffic does HWY 029 over Dairy Creek carry?

About 28,179 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is HWY 029 over Dairy Creek?

The structure is 330 ft (100.6 m) long with a longest span of 50 ft (15.2 m) and a deck 68 ft wide.

Who owns HWY 029 over Dairy Creek?

It is owned by the State Highway Agency.