US Bridges

Oil City Road over Fossil Creek

Good

Jefferson County, Washington · 9.75 SW JCT SR101 · Structure no. 088152000000000

Built
2005
20 years old
Condition
Good
inspected May 2024
Type
Slab
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
30
2021 count
Owner
County
County Highway Agency

About this bridge

Oil City Road over Fossil Creek is a prestressed concrete slab carrying Oil City Road over Fossil Creek in Jefferson County, Washington. It was built in 2005, so it is 20 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 78 by 2040. The structure is 64 ft (19.5 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesOil City Road
CrossesFossil Creek
Location9.75 SW JCT SR101
RouteCounty Highway 13430
Coordinates47.74971, -124.40502
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating45.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length64 ft (19.5 m)
Longest span60 ft (18.3 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2021)
Projected traffic78 by 2040
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Oil City Road over Fossil Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is Oil City Road over Fossil Creek 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 May 2024.

How much traffic does Oil City Road over Fossil Creek carry?

About 30 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Oil City Road over Fossil Creek?

The structure is 64 ft (19.5 m) long with a longest span of 60 ft (18.3 m) and a deck 16 ft wide.

Who owns Oil City Road over Fossil Creek?

It is owned by the County Highway Agency.