US Bridges

Or 86 (hwy 12) over Powder River

Fair

Baker County, Oregon · 080 M West of Richland or · Structure no. 16811 012 03186

Built
1987
38 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
341 ft
3 main spans
Daily traffic
589
2022 count
Owner
State
State Highway Agency

About this bridge

Or 86 (hwy 12) over Powder River is a prestressed concrete stringer/multi-beam or girder carrying Or 86 (hwy 12) over Powder River in Baker County, Oregon. It was built in 1987, so it is 38 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 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 589 vehicles a day, roughly 26% of them trucks, projected to reach 600 by 2042. The structure is 341 ft (104 m) long and 39 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesOr 86 (hwy 12)
CrossesPowder River
Location080 M West of Richland or
RouteState Highway 86
CountyBaker County
StateOregon
Coordinates44.79622, -117.30666
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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length341 ft (104 m)
Longest span140 ft (42.7 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic589 (2022)
Projected traffic600 by 2042
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Or 86 (hwy 12) over Powder River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Or 86 (hwy 12) over Powder 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 July 2024.

How much traffic does Or 86 (hwy 12) over Powder River carry?

About 589 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is Or 86 (hwy 12) over Powder River?

The structure is 341 ft (104 m) long with a longest span of 140 ft (42.7 m) and a deck 39 ft wide.

Who owns Or 86 (hwy 12) over Powder River?

It is owned by the State Highway Agency.