US Bridges

N Fork Siuslaw RD over N. Fork Siuslaw Overflow

Fair

Lane County, Oregon · 060 NE of Florence · Structure no. 39C526507000533

Built
1969
56 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
87 ft
3 main spans
Daily traffic
1,093
2020 count
Owner
County
County Highway Agency

About this bridge

N Fork Siuslaw RD over N. Fork Siuslaw Overflow is a concrete continuous slab carrying N Fork Siuslaw RD over N. Fork Siuslaw Overflow in Lane County, Oregon. It was built in 1969, so it is 56 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 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 1,093 vehicles a day, roughly 10% of them trucks, projected to reach 1,263 by 2025. The structure is 87 ft (26.5 m) long and 36 ft wide. If it were closed, the detour would be 9.3 mi (15 km).

Location

Open in Google Maps
CarriesN Fork Siuslaw RD
CrossesN. Fork Siuslaw Overflow
Location060 NE of Florence
RouteCounty Highway C5070
CountyLane County
StateOregon
Coordinates44.02048, -124.03868
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span34 ft (10.4 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,093 (2020)
Projected traffic1,263 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.3 mi (15 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 N Fork Siuslaw RD over N. Fork Siuslaw Overflow built?

It was built in 1969, making it 56 years old in 2025.

What condition is N Fork Siuslaw RD over N. Fork Siuslaw Overflow 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 2023.

How much traffic does N Fork Siuslaw RD over N. Fork Siuslaw Overflow carry?

About 1,093 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is N Fork Siuslaw RD over N. Fork Siuslaw Overflow?

The structure is 87 ft (26.5 m) long with a longest span of 34 ft (10.4 m) and a deck 36 ft wide.

Who owns N Fork Siuslaw RD over N. Fork Siuslaw Overflow?

It is owned by the County Highway Agency.