US Bridges

Troy Road over Wenaha River

Fair

Wallowa County, Oregon · 37.9 MI N of HWY 82 · Structure no. 16420 515 03789

Built
1981
44 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
112 ft
1 main span
Daily traffic
445
2020 count
Owner
County
County Highway Agency

About this bridge

Troy Road over Wenaha River is a prestressed concrete tee beam carrying Troy Road over Wenaha River in Wallowa County, Oregon. It was built in 1981, so it is 44 years old, younger 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 445 vehicles a day, roughly 10% of them trucks, projected to reach 515 by 2025. The structure is 112 ft (34.1 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesTroy Road
CrossesWenaha River
Location37.9 MI N of HWY 82
RouteCounty Highway 0
CountyWallowa County
StateOregon
Coordinates45.94539, -117.4515
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.
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span109 ft (33.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic445 (2020)
Projected traffic515 by 2025
Trucks10%
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 Troy Road over Wenaha River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Troy Road over Wenaha River 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 2023.

How much traffic does Troy Road over Wenaha River carry?

About 445 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Troy Road over Wenaha River?

The structure is 112 ft (34.1 m) long with a longest span of 109 ft (33.2 m) and a deck 31 ft wide.

Who owns Troy Road over Wenaha River?

It is owned by the County Highway Agency.