US Bridges

South Fork Road over South Fork Smith River

Good

Del Norte County, California · 0.4 MI SE of US 199 · Structure no. 01C0046

Built
2017
8 years old
Condition
Good
inspected June 2023
Type
Arch - Deck
Concrete
Length
231 ft
1 main span
Daily traffic
568
2014 count
Owner
County
County Highway Agency

About this bridge

South Fork Road over South Fork Smith River is a concrete arch - deck carrying South Fork Road over South Fork Smith River in Del Norte County, California. It was built in 2017, so it is 8 years old, younger than the California average of 54.8 years.

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

It carries about 568 vehicles a day, roughly 3% of them trucks, projected to reach 950 by 2041. The structure is 231 ft (70.4 m) long and 36 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

CarriesSouth Fork Road
CrossesSouth Fork Smith River
Location0.4 MI SE of US 199
RouteCounty Highway 0
Coordinates41.79686, -124.05427
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHL 93
Structure length231 ft (70.4 m)
Longest span141 ft (43 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic568 (2014)
Projected traffic950 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 2017, making it 8 years old in 2025.

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

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

About 568 vehicles per day (2014 count), of which roughly 3% are trucks.

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

The structure is 231 ft (70.4 m) long with a longest span of 141 ft (43 m) and a deck 36 ft wide.

Who owns South Fork Road over South Fork Smith River?

It is owned by the County Highway Agency.