US Bridges

Cochran Road over Nehalem River

Fair

Tillamook County, Oregon · 5.5 MI West of Timber · Structure no. 13328A582 00615

Built
1981
44 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
32
2010 count
Owner
State
Other State Agency

About this bridge

Cochran Road over Nehalem River is a prestressed concrete slab carrying Cochran Road over Nehalem River in Tillamook County, Oregon. It was built in 1981, so it is 44 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 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 32 vehicles a day, roughly 15% of them trucks, projected to reach 56 by 2030. The structure is 35 ft (10.7 m) long and 16 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesCochran Road
CrossesNehalem River
Location5.5 MI West of Timber
RouteCounty Highway C0582
CountyTillamook County
StateOregon
Coordinates45.71356, -123.39247
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span33 ft (10.1 m)
Deck width16 ft (4.9 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32 (2010)
Projected traffic56 by 2030
Trucks15%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State Agency
Maintained byOther State 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 Cochran Road over Nehalem River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Cochran Road 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 July 2024.

How much traffic does Cochran Road over Nehalem River carry?

About 32 vehicles per day (2010 count), of which roughly 15% are trucks.

How long is Cochran Road over Nehalem River?

The structure is 35 ft (10.7 m) long with a longest span of 33 ft (10.1 m) and a deck 16 ft wide.

Who owns Cochran Road over Nehalem River?

It is owned by the Other State Agency.