US Bridges

Siuslaw RD over Doe Creek

Fair

Lane County, Oregon · 160 MI W Cottage Grove · Structure no. 39C449439003433

Built
1973
52 years old
Condition
Fair
inspected July 2024
Type
Channel Beam
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
65
2020 count
Owner
County
County Highway Agency

About this bridge

Siuslaw RD over Doe Creek is a prestressed concrete channel beam carrying Siuslaw RD over Doe Creek in Lane County, Oregon. It was built in 1973, so it is 52 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 65 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2025. The structure is 72 ft (21.9 m) long and 32 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesSiuslaw RD
CrossesDoe Creek
Location160 MI W Cottage Grove
RouteCounty Highway C4390
StateOregon
Coordinates43.84258, -123.38685
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span71 ft (21.6 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2020)
Projected traffic75 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Siuslaw RD over Doe Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Siuslaw RD over Doe Creek 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 2024.

How much traffic does Siuslaw RD over Doe Creek carry?

About 65 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Siuslaw RD over Doe Creek?

The structure is 72 ft (21.9 m) long with a longest span of 71 ft (21.6 m) and a deck 32 ft wide.

Who owns Siuslaw RD over Doe Creek?

It is owned by the County Highway Agency.