US Bridges

Port Wine Road over Slate Creek

FairPosted for load

Plumas County, California · 2.1 MI Se/O Quin-Lapor R · Structure no. 09C0014

Built
1910
115 years old
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel
Length
123 ft
1 main span
Daily traffic
50
2019 count
Owner
County
County Highway Agency

About this bridge

Port Wine Road over Slate Creek is a steel truss - thru carrying Port Wine Road over Slate Creek in Plumas County, California. It was built in 1910, so it is 115 years old, older than the California average of 54.8 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 53 by 2044. The structure is 123 ft (37.5 m) long and 13 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesPort Wine Road
CrossesSlate Creek
Location2.1 MI Se/O Quin-Lapor R
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates39.66162, -120.96436
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating13.9 US tons
Inventory rating8.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length123 ft (37.5 m)
Longest span120 ft (36.6 m)
Deck width13 ft (3.9 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deck13 ft (4.1 m)

Traffic and service

Average daily traffic50 (2019)
Projected traffic53 by 2044
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 Port Wine Road over Slate Creek built?

It was built in 1910, making it 115 years old in 2025.

What condition is Port Wine Road over Slate Creek 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 October 2023.

How much traffic does Port Wine Road over Slate Creek carry?

About 50 vehicles per day (2019 count).

How long is Port Wine Road over Slate Creek?

The structure is 123 ft (37.5 m) long with a longest span of 120 ft (36.6 m) and a deck 13 ft wide.

Who owns Port Wine Road over Slate Creek?

It is owned by the County Highway Agency.