US Bridges

US101 (hwy 9) over Drainage Ditch

Fair

Tillamook County, Oregon · 001 MI S Tillamook · Structure no. 07224 009 06636

Built
1950
75 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
52 ft
3 main spans
Daily traffic
9,395
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Drainage Ditch is a concrete continuous slab carrying US101 (hwy 9) over Drainage Ditch in Tillamook County, Oregon. It was built in 1950, so it is 75 years old, older 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 9,395 vehicles a day, roughly 16% of them trucks, projected to reach 9,500 by 2042. The structure is 52 ft (15.8 m) long and 73 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesUS101 (hwy 9)
CrossesDrainage Ditch
Location001 MI S Tillamook
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.4478, -123.84263
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span20 ft (6.1 m)
Deck width73 ft (22.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,395 (2022)
Projected traffic9,500 by 2042
Trucks16%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Drainage Ditch built?

It was built in 1950, making it 75 years old in 2025.

What condition is US101 (hwy 9) over Drainage Ditch 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 2024.

How much traffic does US101 (hwy 9) over Drainage Ditch carry?

About 9,395 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is US101 (hwy 9) over Drainage Ditch?

The structure is 52 ft (15.8 m) long with a longest span of 20 ft (6.1 m) and a deck 73 ft wide.

Who owns US101 (hwy 9) over Drainage Ditch?

It is owned by the State Highway Agency.