US Bridges

Or 99 (hwy 234) over North Umpqua River

FairPosted for load

Douglas County, Oregon · 03.4 N Roseburg Ncl · Structure no. 00839 234 01221

Built
1923
102 years old
Condition
Fair
inspected April 2024
Type
Arch - Deck
Concrete Continuous
Length
902 ft
7 main spans
Daily traffic
7,974
2020 count
Owner
County
County Highway Agency

About this bridge

Or 99 (hwy 234) over North Umpqua River is a concrete continuous arch - deck carrying Or 99 (hwy 234) over North Umpqua River in Douglas County, Oregon. It was built in 1923, so it is 102 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 7,974 vehicles a day, roughly 6% of them trucks, projected to reach 8,724 by 2025. The structure is 902 ft (274.8 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesOr 99 (hwy 234)
CrossesNorth Umpqua River
Location03.4 N Roseburg Ncl
RouteState Highway 99
CountyDouglas County
StateOregon
Coordinates43.28318, -123.35538
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7 (+6 approach)
Design loadH 15
Structure length902 ft (274.8 m)
Longest span112 ft (34.1 m)
Deck width32 ft (9.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,974 (2020)
Projected traffic8,724 by 2025
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$4.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 99 (hwy 234) over North Umpqua River built?

It was built in 1923, making it 102 years old in 2025.

What condition is Or 99 (hwy 234) over North 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 April 2024.

How much traffic does Or 99 (hwy 234) over North Umpqua River carry?

About 7,974 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Or 99 (hwy 234) over North Umpqua River?

The structure is 902 ft (274.8 m) long with a longest span of 112 ft (34.1 m) and a deck 32 ft wide.

Who owns Or 99 (hwy 234) over North Umpqua River?

It is owned by the County Highway Agency.