US Bridges

County RD 387 over South Umpqua River

Good

Douglas County, Oregon · 2.8 MI S of Dillard · Structure no. 17982 387 449

Built
2000
25 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
532 ft
3 main spans
Daily traffic
8,401
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 387 over South Umpqua River is a prestressed concrete continuous stringer/multi-beam or girder carrying County RD 387 over South Umpqua River in Douglas County, Oregon. It was built in 2000, so it is 25 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,401 vehicles a day, roughly 30% of them trucks, projected to reach 10,564 by 2025. The structure is 532 ft (162.2 m) long and 42 ft wide. If it were closed, the detour would be 18 mi (29 km).

CarriesCounty RD 387
CrossesSouth Umpqua River
Location2.8 MI S of Dillard
RouteCounty Highway 0A412
StateOregon
Coordinates43.08079, -123.38658
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 alignment7: Better than present minimum criteria
Operating rating62.2 US tons
Inventory rating47.8 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length532 ft (162.2 m)
Longest span200 ft (61 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,401 (2020)
Projected traffic10,564 by 2025
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County RD 387 over South Umpqua River built?

It was built in 2000, making it 25 years old in 2025.

What condition is County RD 387 over South Umpqua River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does County RD 387 over South Umpqua River carry?

About 8,401 vehicles per day (2020 count), of which roughly 30% are trucks.

How long is County RD 387 over South Umpqua River?

The structure is 532 ft (162.2 m) long with a longest span of 200 ft (61 m) and a deck 42 ft wide.

Who owns County RD 387 over South Umpqua River?

It is owned by the County Highway Agency.