US Bridges

County RD 47 over South Umpqua River

Fair

Douglas County, Oregon · 0.5 MI S of Dillard · Structure no. 19C499 47 007

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
509 ft
3 main spans
Daily traffic
6,965
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 47 over South Umpqua River is a prestressed concrete stringer/multi-beam or girder carrying County RD 47 over South Umpqua River in Douglas County, Oregon. It was built in 1965, so it is 60 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 6,965 vehicles a day, roughly 30% of them trucks, projected to reach 7,715 by 2025. The structure is 509 ft (155.1 m) long and 34 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCounty RD 47
CrossesSouth Umpqua River
Location0.5 MI S of Dillard
RouteCounty Highway C0047
CountyDouglas County
StateOregon
Coordinates43.09778, -123.43006
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+5 approach)
Design loadHS 20
Structure length509 ft (155.1 m)
Longest span110 ft (33.5 m)
Deck width34 ft (10.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,965 (2020)
Projected traffic7,715 by 2025
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 47 over South Umpqua River built?

It was built in 1965, making it 60 years old in 2025.

What condition is County RD 47 over South 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 July 2023.

How much traffic does County RD 47 over South Umpqua River carry?

About 6,965 vehicles per day (2020 count), of which roughly 30% are trucks.

How long is County RD 47 over South Umpqua River?

The structure is 509 ft (155.1 m) long with a longest span of 110 ft (33.5 m) and a deck 34 ft wide.

Who owns County RD 47 over South Umpqua River?

It is owned by the County Highway Agency.