US Bridges

US 30 (hwy 066) over Old Settlers Slough

Fair

Baker County, Oregon · 12.9 Mi. S. Union CO Line · Structure no. 00493 066 04571

Built
1920
105 years old, rebuilt 1930
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
2,351
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 (hwy 066) over Old Settlers Slough is a concrete continuous culvert carrying US 30 (hwy 066) over Old Settlers Slough in Baker County, Oregon. It was built in 1920 and reconstructed in 1930, so it is 105 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 2,351 vehicles a day, roughly 19% of them trucks, projected to reach 2,500 by 2042. The structure is 23 ft (7 m) long. If it were closed, the detour would be 42.3 mi (68 km).

CarriesUS 30 (hwy 066)
CrossesOld Settlers Slough
Location12.9 Mi. S. Union CO Line
RouteU.S. Route 30
StateOregon
Coordinates44.8478, -117.8884
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,351 (2022)
Projected traffic2,500 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 30 (hwy 066) over Old Settlers Slough built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1930.

What condition is US 30 (hwy 066) over Old Settlers 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 June 2023.

How much traffic does US 30 (hwy 066) over Old Settlers Slough carry?

About 2,351 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is US 30 (hwy 066) over Old Settlers Slough?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns US 30 (hwy 066) over Old Settlers Slough?

It is owned by the State Highway Agency.