US Bridges

Forest Road over South Fork Eel River

Fair

Humboldt County, California · 0.1 MI W/O Redwood DR · Structure no. 04F0001

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
500 ft
3 main spans
Daily traffic
110
2011 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Forest Road over South Fork Eel River is a steel continuous stringer/multi-beam or girder carrying Forest Road over South Fork Eel River in Humboldt County, California. It was built in 1965, so it is 60 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.

It carries about 110 vehicles a day, roughly 20% of them trucks, projected to reach 163 by 2045. The structure is 500 ft (152.4 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesForest Road
CrossesSouth Fork Eel River
Location0.1 MI W/O Redwood DR
RouteState Lands Road 0
Coordinates40.13971, -123.81514
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating34.3 US tons
Inventory rating20.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length500 ft (152.4 m)
Longest span200 ft (61 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2011)
Projected traffic163 by 2045
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation 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 Forest Road over South Fork Eel River built?

It was built in 1965, making it 60 years old in 2025.

What condition is Forest Road over South Fork Eel 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 July 2023.

How much traffic does Forest Road over South Fork Eel River carry?

About 110 vehicles per day (2011 count), of which roughly 20% are trucks.

How long is Forest Road over South Fork Eel River?

The structure is 500 ft (152.4 m) long with a longest span of 200 ft (61 m) and a deck 30 ft wide.

Who owns Forest Road over South Fork Eel River?

It is owned by the State Park, Forest, or Reservation Agency and maintained by the County Highway Agency.