US Bridges

County RD 45 over Willanch Slough

Fair

Coos County, Oregon · 02 South Kentuckgolf Cour · Structure no. C1110 004500458

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
1,028
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 45 over Willanch Slough is a prestressed concrete slab carrying County RD 45 over Willanch Slough in Coos County, Oregon. It was built in 1978, so it is 47 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 1,028 vehicles a day, roughly 10% of them trucks, projected to reach 1,163 by 2025. The structure is 42 ft (12.8 m) long and 32 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesCounty RD 45
CrossesWillanch Slough
Location02 South Kentuckgolf Cour
RouteCounty Highway 0A433
CountyCoos County
StateOregon
Coordinates43.40155, -124.19088
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection4 PoorAdvanced section loss, deterioration, 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,028 (2020)
Projected traffic1,163 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 County RD 45 over Willanch Slough built?

It was built in 1978, making it 47 years old in 2025.

What condition is County RD 45 over Willanch Slough 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 County RD 45 over Willanch Slough carry?

About 1,028 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 45 over Willanch Slough?

The structure is 42 ft (12.8 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns County RD 45 over Willanch Slough?

It is owned by the County Highway Agency.