US Bridges

US 26 (hwy 47) over N Fork Necanicum River

Fair

Clatsop County, Oregon · 071 MI SE Cannon Bch JCT · Structure no. 06524 047 00707

Built
1942
83 years old
Condition
Fair
inspected May 2023
Type
Girder and Floorbeam System
Concrete Continuous
Length
100 ft
3 main spans
Daily traffic
5,133
2022 count
Owner
State
State Highway Agency

About this bridge

US 26 (hwy 47) over N Fork Necanicum River is a concrete continuous girder and floorbeam system carrying US 26 (hwy 47) over N Fork Necanicum River in Clatsop County, Oregon. It was built in 1942, so it is 83 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 5,133 vehicles a day, roughly 11% of them trucks, projected to reach 7,500 by 2042. The structure is 100 ft (30.5 m) long and 36 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesUS 26 (hwy 47)
CrossesN Fork Necanicum River
Location071 MI SE Cannon Bch JCT
RouteU.S. Route 26
StateOregon
Coordinates45.9081, -123.80676
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length100 ft (30.5 m)
Longest span57 ft (17.3 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,133 (2022)
Projected traffic7,500 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 26 (hwy 47) over N Fork Necanicum River built?

It was built in 1942, making it 83 years old in 2025.

What condition is US 26 (hwy 47) over N Fork Necanicum 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 May 2023.

How much traffic does US 26 (hwy 47) over N Fork Necanicum River carry?

About 5,133 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is US 26 (hwy 47) over N Fork Necanicum River?

The structure is 100 ft (30.5 m) long with a longest span of 57 ft (17.3 m) and a deck 36 ft wide.

Who owns US 26 (hwy 47) over N Fork Necanicum River?

It is owned by the State Highway Agency.