US Bridges

Logsden Road over Siletz River

Fair

Lincoln County, Oregon · At Logsden · Structure no. 20556 000 00759

Built
2009
16 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
360 ft
3 main spans
Daily traffic
1,179
2020 count
Owner
County
County Highway Agency

About this bridge

Logsden Road over Siletz River is a prestressed concrete stringer/multi-beam or girder carrying Logsden Road over Siletz River in Lincoln County, Oregon. It was built in 2009, so it is 16 years old, younger 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 1,179 vehicles a day, roughly 15% of them trucks, projected to reach 1,644 by 2040. The structure is 360 ft (109.7 m) long and 37 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesLogsden Road
CrossesSiletz River
LocationAt Logsden
RouteCounty Highway 0
CountyLincoln County
StateOregon
Coordinates44.74287, -123.7919
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.5 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length360 ft (109.7 m)
Longest span130 ft (39.6 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,179 (2020)
Projected traffic1,644 by 2040
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Logsden Road over Siletz River built?

It was built in 2009, making it 16 years old in 2025.

What condition is Logsden Road over Siletz 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 September 2024.

How much traffic does Logsden Road over Siletz River carry?

About 1,179 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Logsden Road over Siletz River?

The structure is 360 ft (109.7 m) long with a longest span of 130 ft (39.6 m) and a deck 37 ft wide.

Who owns Logsden Road over Siletz River?

It is owned by the County Highway Agency.