US Bridges

Mcdonald Dike Road over N Fork Nehalem River

Fair

Tillamook County, Oregon · 1.5 Miles N of Nehalem · Structure no. 11272A568 00115

Built
1992
33 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
357 ft
3 main spans
Daily traffic
902
2020 count
Owner
County
County Highway Agency

About this bridge

Mcdonald Dike Road over N Fork Nehalem River is a prestressed concrete stringer/multi-beam or girder carrying Mcdonald Dike Road over N Fork Nehalem River in Tillamook County, Oregon. It was built in 1992, so it is 33 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 902 vehicles a day, roughly 15% of them trucks, projected to reach 1,072 by 2025. The structure is 357 ft (108.8 m) long and 31 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesMcdonald Dike Road
CrossesN Fork Nehalem River
Location1.5 Miles N of Nehalem
RouteCounty Highway A0713
CountyTillamook County
StateOregon
Coordinates45.73366, -123.87626
Functional classRural Minor 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length357 ft (108.8 m)
Longest span135 ft (41.1 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic902 (2020)
Projected traffic1,072 by 2025
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 Mcdonald Dike Road over N Fork Nehalem River built?

It was built in 1992, making it 33 years old in 2025.

What condition is Mcdonald Dike Road over N 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 Mcdonald Dike Road over N Fork Nehalem River carry?

About 902 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Mcdonald Dike Road over N Fork Nehalem River?

The structure is 357 ft (108.8 m) long with a longest span of 135 ft (41.1 m) and a deck 31 ft wide.

Who owns Mcdonald Dike Road over N Fork Nehalem River?

It is owned by the County Highway Agency.