US Bridges

Cot Gr-Lorane Road over Silk Creek

Fair

Lane County, Oregon · 024 MI W HWY 99 · Structure no. 039C19260000242

Built
1982
43 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
2,025
2020 count
Owner
County
County Highway Agency

About this bridge

Cot Gr-Lorane Road over Silk Creek is a prestressed concrete slab carrying Cot Gr-Lorane Road over Silk Creek in Lane County, Oregon. It was built in 1982, so it is 43 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 2,025 vehicles a day, roughly 10% of them trucks, projected to reach 2,295 by 2025. The structure is 67 ft (20.4 m) long and 32 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesCot Gr-Lorane Road
CrossesSilk Creek
Location024 MI W HWY 99
RouteCounty Highway A0468
CountyLane County
StateOregon
Coordinates43.80585, -123.10164
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span66 ft (20.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,025 (2020)
Projected traffic2,295 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Cot Gr-Lorane Road over Silk Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is Cot Gr-Lorane Road over Silk 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 September 2024.

How much traffic does Cot Gr-Lorane Road over Silk Creek carry?

About 2,025 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Cot Gr-Lorane Road over Silk Creek?

The structure is 67 ft (20.4 m) long with a longest span of 66 ft (20.1 m) and a deck 32 ft wide.

Who owns Cot Gr-Lorane Road over Silk Creek?

It is owned by the County Highway Agency.