US Bridges

Or 47 (hwy 102) over Rock Creek

Poor

Columbia County, Oregon · In Vernonia · Structure no. 01508 102 06227

Built
1930
95 years old
Condition
Poor
inspected October 2024
Type
Tee Beam
Concrete Continuous
Length
140 ft
3 main spans
Daily traffic
4,450
2022 count
Owner
State
State Highway Agency

About this bridge

Or 47 (hwy 102) over Rock Creek is a concrete continuous tee beam carrying Or 47 (hwy 102) over Rock Creek in Columbia County, Oregon. It was built in 1930, so it is 95 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4,450 vehicles a day, roughly 10% of them trucks, projected to reach 4,700 by 2042. The structure is 140 ft (42.7 m) long and 39 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

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CarriesOr 47 (hwy 102)
CrossesRock Creek
LocationIn Vernonia
RouteState Highway 47
CountyColumbia County
StateOregon
Coordinates45.85873, -123.19212
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length140 ft (42.7 m)
Longest span55 ft (16.8 m)
Deck width39 ft (12 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,450 (2022)
Projected traffic4,700 by 2042
Trucks10%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$712,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 47 (hwy 102) over Rock Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Or 47 (hwy 102) over Rock Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

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

About 4,450 vehicles per day (2022 count), of which roughly 10% are trucks.

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

The structure is 140 ft (42.7 m) long with a longest span of 55 ft (16.8 m) and a deck 39 ft wide.

Who owns Or 47 (hwy 102) over Rock Creek?

It is owned by the State Highway Agency.