US Bridges

HWY 103 over Nehalem River

Fair

Clatsop County, Oregon · 052 MI S Jewell · Structure no. 02074 103 00525

Built
1957
68 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
374 ft
4 main spans
Daily traffic
577
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 103 over Nehalem River is a concrete continuous box beam or girders - multiple carrying HWY 103 over Nehalem River in Clatsop County, Oregon. It was built in 1957, so it is 68 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 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 577 vehicles a day, roughly 15% of them trucks, projected to reach 850 by 2042. The structure is 374 ft (114 m) long and 31 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesHWY 103
CrossesNehalem River
Location052 MI S Jewell
RouteState Highway 103
CountyClatsop County
StateOregon
Coordinates45.89672, -123.54441
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length374 ft (114 m)
Longest span107 ft (32.6 m)
Deck width31 ft (9.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic577 (2022)
Projected traffic850 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 HWY 103 over Nehalem River built?

It was built in 1957, making it 68 years old in 2025.

What condition is HWY 103 over Nehalem 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 October 2023.

How much traffic does HWY 103 over Nehalem River carry?

About 577 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is HWY 103 over Nehalem River?

The structure is 374 ft (114 m) long with a longest span of 107 ft (32.6 m) and a deck 31 ft wide.

Who owns HWY 103 over Nehalem River?

It is owned by the State Highway Agency.