US Bridges

N.W. Staley Rd. over Dairy Creek Trib

Good

Washington County, Oregon · 011 MI W Fisher RD · Structure no. 671382C17700110

Built
1982
43 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
150
2020 count
Owner
County
County Highway Agency

About this bridge

N.W. Staley Rd. over Dairy Creek Trib is a wood or timber stringer/multi-beam or girder carrying N.W. Staley Rd. over Dairy Creek Trib in Washington County, Oregon. It was built in 1982, so it is 43 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 150 vehicles a day, roughly 5% of them trucks, projected to reach 170 by 2025. The structure is 40 ft (12.2 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN.W. Staley Rd.
CrossesDairy Creek Trib
Location011 MI W Fisher RD
RouteCounty Highway C0012
StateOregon
Coordinates45.68437, -123.20524
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2020)
Projected traffic170 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 N.W. Staley Rd. over Dairy Creek Trib built?

It was built in 1982, making it 43 years old in 2025.

What condition is N.W. Staley Rd. over Dairy Creek Trib in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does N.W. Staley Rd. over Dairy Creek Trib carry?

About 150 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is N.W. Staley Rd. over Dairy Creek Trib?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 24 ft wide.

Who owns N.W. Staley Rd. over Dairy Creek Trib?

It is owned by the County Highway Agency.