US Bridges

Mattson Road over N Fk Nehalem

Good

Clatsop County, Oregon · 035 MI SE JCT HWY 53 · Structure no. 11223A130200090

Built
1989
36 years old
Condition
Good
inspected April 2023
Type
Slab
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
83
2020 count
Owner
County
County Highway Agency

About this bridge

Mattson Road over N Fk Nehalem is a prestressed concrete slab carrying Mattson Road over N Fk Nehalem in Clatsop County, Oregon. It was built in 1989, so it is 36 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 83 vehicles a day, projected to reach 93 by 2025. The structure is 72 ft (21.9 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMattson Road
CrossesN Fk Nehalem
Location035 MI SE JCT HWY 53
RouteCounty Highway C1302
CountyClatsop County
StateOregon
Coordinates45.86475, -123.70118
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
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; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating35.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length72 ft (21.9 m)
Longest span70 ft (21.3 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83 (2020)
Projected traffic93 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Mattson Road over N Fk Nehalem built?

It was built in 1989, making it 36 years old in 2025.

What condition is Mattson Road over N Fk Nehalem in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does Mattson Road over N Fk Nehalem carry?

About 83 vehicles per day (2020 count).

How long is Mattson Road over N Fk Nehalem?

The structure is 72 ft (21.9 m) long with a longest span of 70 ft (21.3 m) and a deck 16 ft wide.

Who owns Mattson Road over N Fk Nehalem?

It is owned by the County Highway Agency.