US Bridges

N. F. Nehalem RD over North Fork Nehalem River

Fair

Tillamook County, Oregon · 5.0 MI NE of Nehalem · Structure no. 00633A504 00470

Built
1987
38 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
187 ft
2 main spans
Daily traffic
424
2020 count
Owner
County
County Highway Agency

About this bridge

N. F. Nehalem RD over North Fork Nehalem River is a prestressed concrete stringer/multi-beam or girder carrying N. F. Nehalem RD over North Fork Nehalem River in Tillamook County, Oregon. It was built in 1987, so it is 38 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 424 vehicles a day, roughly 15% of them trucks, projected to reach 504 by 2025. The structure is 187 ft (57 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesN. F. Nehalem RD
CrossesNorth Fork Nehalem River
Location5.0 MI NE of Nehalem
RouteCounty Highway A0712
CountyTillamook County
StateOregon
Coordinates45.76882, -123.84488
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length187 ft (57 m)
Longest span91 ft (27.7 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic424 (2020)
Projected traffic504 by 2025
Trucks15%
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

OwnerCounty Highway Agency
Maintained byCounty 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 N. F. Nehalem RD over North Fork Nehalem River built?

It was built in 1987, making it 38 years old in 2025.

What condition is N. F. Nehalem RD over North Fork 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 June 2023.

How much traffic does N. F. Nehalem RD over North Fork Nehalem River carry?

About 424 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is N. F. Nehalem RD over North Fork Nehalem River?

The structure is 187 ft (57 m) long with a longest span of 91 ft (27.7 m) and a deck 31 ft wide.

Who owns N. F. Nehalem RD over North Fork Nehalem River?

It is owned by the County Highway Agency.