US Bridges

Or 138 (hwy 231) over Umpqua River

Fair

Douglas County, Oregon · 038 MI S Elkton · Structure no. 01311B231 00382

Built
1967
58 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
750 ft
7 main spans
Daily traffic
1,559
2022 count
Owner
State
State Highway Agency

About this bridge

Or 138 (hwy 231) over Umpqua River is a prestressed concrete continuous stringer/multi-beam or girder carrying Or 138 (hwy 231) over Umpqua River in Douglas County, Oregon. It was built in 1967, so it is 58 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 1,559 vehicles a day, roughly 21% of them trucks, projected to reach 1,700 by 2042. The structure is 750 ft (228.6 m) long and 38 ft wide. If it were closed, the detour would be 22.4 mi (36 km).

Location

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CarriesOr 138 (hwy 231)
CrossesUmpqua River
Location038 MI S Elkton
RouteState Highway 138
CountyDouglas County
StateOregon
Coordinates43.58636, -123.55747
Functional classRural Minor Arterial

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 inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
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 rating43.2 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length750 ft (228.6 m)
Longest span130 ft (39.6 m)
Deck width38 ft (11.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,559 (2022)
Projected traffic1,700 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed22.4 mi (36 km)
TollOn a free road
National Highway SystemNo

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 Or 138 (hwy 231) over Umpqua River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Or 138 (hwy 231) over Umpqua River 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 February 2024.

How much traffic does Or 138 (hwy 231) over Umpqua River carry?

About 1,559 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is Or 138 (hwy 231) over Umpqua River?

The structure is 750 ft (228.6 m) long with a longest span of 130 ft (39.6 m) and a deck 38 ft wide.

Who owns Or 138 (hwy 231) over Umpqua River?

It is owned by the State Highway Agency.