US Bridges

US 30 (hwy 92) over Plympton Creek

Fair

Clatsop County, Oregon · 08.0 MI W Clatskanie · Structure no. 00185A02W 07071

Built
1958
67 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
69 ft
3 main spans
Daily traffic
7,845
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 (hwy 92) over Plympton Creek is a concrete continuous slab carrying US 30 (hwy 92) over Plympton Creek in Clatsop County, Oregon. It was built in 1958, so it is 67 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 7,845 vehicles a day, roughly 17% of them trucks, projected to reach 7,900 by 2042. The structure is 69 ft (21 m) long and 45 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesUS 30 (hwy 92)
CrossesPlympton Creek
Location08.0 MI W Clatskanie
RouteU.S. Route 30
CountyClatsop County
StateOregon
Coordinates46.13246, -123.37685
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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length69 ft (21 m)
Longest span27 ft (8.2 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,845 (2022)
Projected traffic7,900 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 US 30 (hwy 92) over Plympton Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is US 30 (hwy 92) over Plympton Creek 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 US 30 (hwy 92) over Plympton Creek carry?

About 7,845 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is US 30 (hwy 92) over Plympton Creek?

The structure is 69 ft (21 m) long with a longest span of 27 ft (8.2 m) and a deck 45 ft wide.

Who owns US 30 (hwy 92) over Plympton Creek?

It is owned by the State Highway Agency.