US Bridges

US101 (hwy 9) over Gallagher Slough

Fair

Tillamook County, Oregon · 010 MI N Wheeler · Structure no. 00714A009 04648

Built
1984
41 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
5,630
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Gallagher Slough is a prestressed concrete slab carrying US101 (hwy 9) over Gallagher Slough in Tillamook County, Oregon. It was built in 1984, so it is 41 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 5,630 vehicles a day, roughly 13% of them trucks, projected to reach 5,800 by 2042. The structure is 37 ft (11.4 m) long and 64 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesUS101 (hwy 9)
CrossesGallagher Slough
Location010 MI N Wheeler
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.7012, -123.88048
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length37 ft (11.4 m)
Longest span37 ft (11.4 m)
Deck width64 ft (19.5 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,630 (2022)
Projected traffic5,800 by 2042
Trucks13%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Gallagher Slough built?

It was built in 1984, making it 41 years old in 2025.

What condition is US101 (hwy 9) over Gallagher Slough 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 Gallagher Slough carry?

About 5,630 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is US101 (hwy 9) over Gallagher Slough?

The structure is 37 ft (11.4 m) long with a longest span of 37 ft (11.4 m) and a deck 64 ft wide.

Who owns US101 (hwy 9) over Gallagher Slough?

It is owned by the State Highway Agency.