US Bridges

Avenue S over Neawanna Creek

Fair

Clatsop County, Oregon · 005 MI E of Seaside · Structure no. 11149A110100222

Built
1975
50 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
1,510
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Avenue S over Neawanna Creek is a prestressed concrete slab carrying Avenue S over Neawanna Creek in Clatsop County, Oregon. It was built in 1975, so it is 50 years old, older 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 1,510 vehicles a day, roughly 10% of them trucks, projected to reach 1,755 by 2025. The structure is 150 ft (45.7 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesAvenue S
CrossesNeawanna Creek
Location005 MI E of Seaside
RouteCounty Highway C1101
CountyClatsop County
StateOregon
Coordinates45.9826, -123.91962
Functional classUrban Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum 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 spans3
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,510 (2020)
Projected traffic1,755 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Avenue S over Neawanna Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Avenue S over Neawanna 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 April 2023.

How much traffic does Avenue S over Neawanna Creek carry?

About 1,510 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Avenue S over Neawanna Creek?

The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns Avenue S over Neawanna Creek?

It is owned by the City or Municipal Highway Agency.