US Bridges

NW Dairy Creek RD over E Fork Dairy Creek

Fair

Washington County, Oregon · 006 MI N Mountaindale RD · Structure no. 671361A68400060

Built
1969
56 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
82 ft
3 main spans
Daily traffic
1,572
2020 count
Owner
County
County Highway Agency

About this bridge

NW Dairy Creek RD over E Fork Dairy Creek is a prestressed concrete slab carrying NW Dairy Creek RD over E Fork Dairy 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 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 1,572 vehicles a day, roughly 5% of them trucks, projected to reach 1,782 by 2025. The structure is 82 ft (25 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNW Dairy Creek RD
CrossesE Fork Dairy Creek
Location006 MI N Mountaindale RD
RouteCounty Highway A0684
StateOregon
Coordinates45.63376, -123.04151
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61.4 US tons
Inventory rating47.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length82 ft (25 m)
Longest span36 ft (11 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,572 (2020)
Projected traffic1,782 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NW Dairy Creek RD over E Fork Dairy Creek built?

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

What condition is NW Dairy Creek RD over E Fork 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 August 2024.

How much traffic does NW Dairy Creek RD over E Fork Dairy Creek carry?

About 1,572 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is NW Dairy Creek RD over E Fork Dairy Creek?

The structure is 82 ft (25 m) long with a longest span of 36 ft (11 m) and a deck 28 ft wide.

Who owns NW Dairy Creek RD over E Fork Dairy Creek?

It is owned by the County Highway Agency.