US Bridges

US101 (hwy 9) over Potb RR

Fair

Tillamook County, Oregon · In Bay City · Structure no. 08828 009 05932

Built
1962
63 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
181 ft
3 main spans
Daily traffic
9,363
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Potb RR is a concrete continuous tee beam carrying US101 (hwy 9) over Potb RR in Tillamook County, Oregon. It was built in 1962, so it is 63 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 9,363 vehicles a day, roughly 4% of them trucks, projected to reach 9,500 by 2042. The structure is 181 ft (55.2 m) long and 35 ft wide. If it were closed, the detour would be 55.9 mi (90 km).

Location

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CarriesUS101 (hwy 9)
CrossesPotb RR
LocationIn Bay City
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.53119, -123.89797
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.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length181 ft (55.2 m)
Longest span70 ft (21.3 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,363 (2022)
Projected traffic9,500 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$927,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US101 (hwy 9) over Potb RR built?

It was built in 1962, making it 63 years old in 2025.

What condition is US101 (hwy 9) over Potb RR 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 Potb RR carry?

About 9,363 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is US101 (hwy 9) over Potb RR?

The structure is 181 ft (55.2 m) long with a longest span of 70 ft (21.3 m) and a deck 35 ft wide.

Who owns US101 (hwy 9) over Potb RR?

It is owned by the State Highway Agency.