US Bridges

Scappoose-Vernonia over Crown Z Road

Poor

Columbia County, Oregon · 047 M W Spitzenburg · Structure no. 09C18 306900835

Built
1963
62 years old
Condition
Poor
inspected May 2023
Type
Slab
Prestressed Concrete
Length
75 ft
3 main spans
Daily traffic
562
2020 count
Owner
County
County Highway Agency

About this bridge

Scappoose-Vernonia over Crown Z Road is a prestressed concrete slab carrying Scappoose-Vernonia over Crown Z Road in Columbia County, Oregon. It was built in 1963, so it is 62 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 562 vehicles a day, roughly 10% of them trucks, projected to reach 597 by 2025. The structure is 75 ft (22.9 m) long and 29 ft wide. If it were closed, the detour would be 28.6 mi (46 km).

Location

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CarriesScappoose-Vernonia
CrossesCrown Z Road
Location047 M W Spitzenburg
RouteCounty Highway A0744
CountyColumbia County
StateOregon
Coordinates45.83222, -123.04654
Functional classRural Minor Arterial

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.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating50 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span25 ft (7.6 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic562 (2020)
Projected traffic597 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed28.6 mi (46 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$384,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Scappoose-Vernonia over Crown Z Road built?

It was built in 1963, making it 62 years old in 2025.

What condition is Scappoose-Vernonia over Crown Z Road 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 May 2023.

How much traffic does Scappoose-Vernonia over Crown Z Road carry?

About 562 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Scappoose-Vernonia over Crown Z Road?

The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.6 m) and a deck 29 ft wide.

Who owns Scappoose-Vernonia over Crown Z Road?

It is owned by the County Highway Agency.