US Bridges

Or 47 (hwy 102) over Oak Ranch Creek

Fair

Columbia County, Oregon · 7.0 MI S HWY 110 JCT · Structure no. 01748A102 05307

Built
1978
47 years old
Condition
Fair
inspected October 2024
Type
Slab
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
1,160
2022 count
Owner
State
State Highway Agency

About this bridge

Or 47 (hwy 102) over Oak Ranch Creek is a prestressed concrete slab carrying Or 47 (hwy 102) over Oak Ranch Creek in Columbia County, Oregon. It was built in 1978, so it is 47 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 1,160 vehicles a day, roughly 29% of them trucks, projected to reach 1,300 by 2042. The structure is 70 ft (21.3 m) long and 36 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

Open in Google Maps
CarriesOr 47 (hwy 102)
CrossesOak Ranch Creek
Location7.0 MI S HWY 110 JCT
RouteState Highway 47
CountyColumbia County
StateOregon
Coordinates45.94637, -123.16488
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span70 ft (21.3 m)
Deck width36 ft (11 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,160 (2022)
Projected traffic1,300 by 2042
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 47 (hwy 102) over Oak Ranch Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Or 47 (hwy 102) over Oak Ranch 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 October 2024.

How much traffic does Or 47 (hwy 102) over Oak Ranch Creek carry?

About 1,160 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is Or 47 (hwy 102) over Oak Ranch Creek?

The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 36 ft wide.

Who owns Or 47 (hwy 102) over Oak Ranch Creek?

It is owned by the State Highway Agency.