US Bridges

South Fork Road over South Fork Smith River

Fair

Del Norte County, California · 6.1 Mile SE of RTE 199 · Structure no. 01C0037

Built
1981
44 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
473 ft
2 main spans
Daily traffic
334
2000 count
Owner
County
County Highway Agency

About this bridge

South Fork Road over South Fork Smith River is a prestressed concrete continuous box beam or girders - multiple carrying South Fork Road over South Fork Smith River in Del Norte County, California. It was built in 1981, so it is 44 years old, younger 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.

It carries about 334 vehicles a day, roughly 10% of them trucks, projected to reach 546 by 2041. The structure is 473 ft (144.2 m) long and 35 ft wide. If it were closed, the detour would be 41 mi (66 km).

CarriesSouth Fork Road
CrossesSouth Fork Smith River
Location6.1 Mile SE of RTE 199
RouteCounty Highway 0
Coordinates41.75094, -123.99142
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating93.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 20 + Mod
Structure length473 ft (144.2 m)
Longest span222 ft (67.7 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic334 (2000)
Projected traffic546 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 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 South Fork Road over South Fork Smith River built?

It was built in 1981, making it 44 years old in 2025.

What condition is South Fork Road over South Fork Smith River 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 June 2023.

How much traffic does South Fork Road over South Fork Smith River carry?

About 334 vehicles per day (2000 count), of which roughly 10% are trucks.

How long is South Fork Road over South Fork Smith River?

The structure is 473 ft (144.2 m) long with a longest span of 222 ft (67.7 m) and a deck 35 ft wide.

Who owns South Fork Road over South Fork Smith River?

It is owned by the County Highway Agency.