US Bridges

US101 (hwy 9) over Big Creek

Fair

Lane County, Oregon · 07.4 MI S Linc-Lane CO LN · Structure no. 01180 009 17502

Built
1931
94 years old, rebuilt 1997
Condition
Fair
inspected July 2023
Type
Arch - Thru
Concrete
Length
239 ft
1 main span
Daily traffic
3,003
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Big Creek is a concrete arch - thru carrying US101 (hwy 9) over Big Creek in Lane County, Oregon. It was built in 1931 and reconstructed in 1997, so it is 94 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 3,003 vehicles a day, roughly 8% of them trucks, projected to reach 4,200 by 2042. The structure is 239 ft (72.9 m) long and 39 ft wide. If it were closed, the detour would be 81.4 mi (131 km).

Location

Open in Google Maps
CarriesUS101 (hwy 9)
CrossesBig Creek
Location07.4 MI S Linc-Lane CO LN
RouteU.S. Route 101
CountyLane County
StateOregon
Coordinates44.17433, -124.11531
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeArch - Thru
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadH 15
Structure length239 ft (72.9 m)
Longest span120 ft (36.6 m)
Deck width39 ft (12 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deck20 ft (6.1 m)

Traffic and service

Average daily traffic3,003 (2022)
Projected traffic4,200 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed81.4 mi (131 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 statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US101 (hwy 9) over Big Creek built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1997.

What condition is US101 (hwy 9) over Big 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 2023.

How much traffic does US101 (hwy 9) over Big Creek carry?

About 3,003 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is US101 (hwy 9) over Big Creek?

The structure is 239 ft (72.9 m) long with a longest span of 120 ft (36.6 m) and a deck 39 ft wide.

Who owns US101 (hwy 9) over Big Creek?

It is owned by the State Highway Agency.