US Bridges

NW Dairy Creek RD over E Fork Dairy Creek

Fair

Washington County, Oregon · 001 MI E Fern Flat RD · Structure no. 671366057100490

Built
1957
68 years old, rebuilt 1994
Condition
Fair
inspected July 2024
Type
Slab
Wood or Timber
Length
57 ft
3 main spans
Daily traffic
305
2020 count
Owner
County
County Highway Agency

About this bridge

NW Dairy Creek RD over E Fork Dairy Creek is a wood or timber slab carrying NW Dairy Creek RD over E Fork Dairy Creek in Washington County, Oregon. It was built in 1957 and reconstructed in 1994, so it is 68 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 305 vehicles a day, roughly 5% of them trucks, projected to reach 345 by 2025. The structure is 57 ft (17.4 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNW Dairy Creek RD
CrossesE Fork Dairy Creek
Location001 MI E Fern Flat RD
RouteCounty Highway C0084
CountyWashington County
StateOregon
Coordinates45.72268, -123.07108
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.
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating27.1 US tons
Inventory rating21.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 25 or greater
Structure length57 ft (17.4 m)
Longest span21 ft (6.4 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic305 (2020)
Projected traffic345 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 1957, making it 68 years old in 2025. It was reconstructed in 1994.

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 July 2024.

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

About 305 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 57 ft (17.4 m) long with a longest span of 21 ft (6.4 m) and a deck 24 ft wide.

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

It is owned by the County Highway Agency.