US Bridges

Upper N Fork Road over Upper No Fk Siuslaw Rive

Good

Lane County, Oregon · 152 MI NE of Florence · Structure no. 39C539508400308

Built
1972
53 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
113 ft
2 main spans
Daily traffic
109
2020 count
Owner
County
County Highway Agency

About this bridge

Upper N Fork Road over Upper No Fk Siuslaw Rive is a prestressed concrete continuous stringer/multi-beam or girder carrying Upper N Fork Road over Upper No Fk Siuslaw Rive in Lane County, Oregon. It was built in 1972, so it is 53 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 109 vehicles a day, projected to reach 124 by 2025. The structure is 113 ft (34.4 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUpper N Fork Road
CrossesUpper No Fk Siuslaw Rive
Location152 MI NE of Florence
RouteCounty Highway C5084
StateOregon
Coordinates44.1019, -123.94201
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98 US tons
Inventory rating51 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span55 ft (16.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic109 (2020)
Projected traffic124 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Upper N Fork Road over Upper No Fk Siuslaw Rive built?

It was built in 1972, making it 53 years old in 2025.

What condition is Upper N Fork Road over Upper No Fk Siuslaw Rive in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Upper N Fork Road over Upper No Fk Siuslaw Rive carry?

About 109 vehicles per day (2020 count).

How long is Upper N Fork Road over Upper No Fk Siuslaw Rive?

The structure is 113 ft (34.4 m) long with a longest span of 55 ft (16.8 m) and a deck 30 ft wide.

Who owns Upper N Fork Road over Upper No Fk Siuslaw Rive?

It is owned by the County Highway Agency.