US Bridges

Tillamook River RD over Tillamook River Overflow

Good

Tillamook County, Oregon · 1.5 MI So Tillamook · Structure no. 57C41 741 00225

Built
1975
50 years old
Condition
Good
inspected June 2023
Type
Slab
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
1,411
2020 count
Owner
County
County Highway Agency

About this bridge

Tillamook River RD over Tillamook River Overflow is a prestressed concrete slab carrying Tillamook River RD over Tillamook River Overflow in Tillamook County, Oregon. It was built in 1975, so it is 50 years old, older 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 1,411 vehicles a day, roughly 15% of them trucks, projected to reach 1,676 by 2025. The structure is 41 ft (12.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesTillamook River RD
CrossesTillamook River Overflow
Location1.5 MI So Tillamook
RouteCounty Highway A0741
StateOregon
Coordinates45.43283, -123.84444
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,411 (2020)
Projected traffic1,676 by 2025
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Tillamook River RD over Tillamook River Overflow built?

It was built in 1975, making it 50 years old in 2025.

What condition is Tillamook River RD over Tillamook River Overflow 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 June 2023.

How much traffic does Tillamook River RD over Tillamook River Overflow carry?

About 1,411 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Tillamook River RD over Tillamook River Overflow?

The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns Tillamook River RD over Tillamook River Overflow?

It is owned by the County Highway Agency.