US Bridges

Cot Gr-Lorane RD over Silk Creek

Fair

Lane County, Oregon · 008 MI W HWY 99 · Structure no. 39C17A260000087

Built
1976
49 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
3,601
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Cot Gr-Lorane RD over Silk Creek is a prestressed concrete stringer/multi-beam or girder carrying Cot Gr-Lorane RD over Silk Creek in Lane County, Oregon. It was built in 1976, so it is 49 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 5 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 3,601 vehicles a day, roughly 10% of them trucks, projected to reach 4,021 by 2025. The structure is 50 ft (15.2 m) long and 62 ft wide.

CarriesCot Gr-Lorane RD
CrossesSilk Creek
Location008 MI W HWY 99
RouteCounty Highway U6500
StateOregon
Coordinates43.79758, -123.0757
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span48 ft (14.6 m)
Deck width62 ft (19 m)
Roadway width49 ft (14.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,601 (2020)
Projected traffic4,021 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Cot Gr-Lorane RD over Silk Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Cot Gr-Lorane RD 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 RD over Silk Creek carry?

About 3,601 vehicles per day (2020 count), of which roughly 10% are trucks.

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

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 62 ft wide.

Who owns Cot Gr-Lorane RD over Silk Creek?

It is owned by the City or Municipal Highway Agency.