US Bridges

Cott Grove-Lorane over North Fork Siuslaw River

Fair

Lane County, Oregon · 0002 MI E Lorane · Structure no. 39C23A260001260

Built
1976
49 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
1,092
2020 count
Owner
County
County Highway Agency

About this bridge

Cott Grove-Lorane over North Fork Siuslaw River is a prestressed concrete slab carrying Cott Grove-Lorane over North Fork Siuslaw River 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 1,092 vehicles a day, roughly 10% of them trucks, projected to reach 1,277 by 2025. The structure is 66 ft (20.1 m) long and 32 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesCott Grove-Lorane
CrossesNorth Fork Siuslaw River
Location0002 MI E Lorane
RouteCounty Highway A0468
CountyLane County
StateOregon
Coordinates43.83719, -123.23761
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.
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 inspectionJuly 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span65 ft (19.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,092 (2020)
Projected traffic1,277 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 Cott Grove-Lorane over North Fork Siuslaw River built?

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

What condition is Cott Grove-Lorane over North Fork Siuslaw 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 2024.

How much traffic does Cott Grove-Lorane over North Fork Siuslaw River carry?

About 1,092 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Cott Grove-Lorane over North Fork Siuslaw River?

The structure is 66 ft (20.1 m) long with a longest span of 65 ft (19.8 m) and a deck 32 ft wide.

Who owns Cott Grove-Lorane over North Fork Siuslaw River?

It is owned by the County Highway Agency.