US Bridges

US101 (hwy 9) over Miami River

Fair

Tillamook County, Oregon · 009 MI S Garibaldi · Structure no. 01226A009 05699

Built
1991
34 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
204 ft
2 main spans
Daily traffic
9,778
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Miami River is a prestressed concrete stringer/multi-beam or girder carrying US101 (hwy 9) over Miami River in Tillamook County, Oregon. It was built in 1991, so it is 34 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 9,778 vehicles a day, roughly 4% of them trucks, projected to reach 9,900 by 2042. The structure is 204 ft (62.2 m) long and 47 ft wide. If it were closed, the detour would be 55.9 mi (90 km).

Location

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CarriesUS101 (hwy 9)
CrossesMiami River
Location009 MI S Garibaldi
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.55996, -123.89225
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length204 ft (62.2 m)
Longest span102 ft (31.1 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,778 (2022)
Projected traffic9,900 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed55.9 mi (90 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US101 (hwy 9) over Miami River built?

It was built in 1991, making it 34 years old in 2025.

What condition is US101 (hwy 9) over Miami 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 March 2023.

How much traffic does US101 (hwy 9) over Miami River carry?

About 9,778 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is US101 (hwy 9) over Miami River?

The structure is 204 ft (62.2 m) long with a longest span of 102 ft (31.1 m) and a deck 47 ft wide.

Who owns US101 (hwy 9) over Miami River?

It is owned by the State Highway Agency.