US Bridges

US101 (hwy 9) over Siltcoos River

FairPosted for load

Lane County, Oregon · 06.6 MI S HWY 062 JCT · Structure no. 00982 009 19693

Built
1930
95 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
172 ft
3 main spans
Daily traffic
4,843
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Siltcoos River is a concrete continuous tee beam carrying US101 (hwy 9) over Siltcoos River in Lane County, Oregon. It was built in 1930, so it is 95 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. Its operating status is: posted for other load-capacity restriction.

It carries about 4,843 vehicles a day, roughly 13% of them trucks, projected to reach 4,900 by 2042. The structure is 172 ft (52.4 m) long and 36 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesUS101 (hwy 9)
CrossesSiltcoos River
Location06.6 MI S HWY 062 JCT
RouteU.S. Route 101
CountyLane County
StateOregon
Coordinates43.88303, -124.12466
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating23.9 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length172 ft (52.4 m)
Longest span68 ft (20.7 m)
Deck width36 ft (11.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,843 (2022)
Projected traffic4,900 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$881,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US101 (hwy 9) over Siltcoos River built?

It was built in 1930, making it 95 years old in 2025.

What condition is US101 (hwy 9) over Siltcoos 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 US101 (hwy 9) over Siltcoos River carry?

About 4,843 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is US101 (hwy 9) over Siltcoos River?

The structure is 172 ft (52.4 m) long with a longest span of 68 ft (20.7 m) and a deck 36 ft wide.

Who owns US101 (hwy 9) over Siltcoos River?

It is owned by the State Highway Agency.