US Bridges

S Quarry Road over Jacoby Creek

Fair

Humboldt County, California · 0.05 MI S Jacoby Creek RD · Structure no. 04C0006

Built
1971
54 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
114 ft
2 main spans
Daily traffic
115
2011 count
Owner
County
County Highway Agency

About this bridge

S Quarry Road over Jacoby Creek is a steel stringer/multi-beam or girder carrying S Quarry Road over Jacoby Creek in Humboldt County, California. It was built in 1971, so it is 54 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 115 vehicles a day, roughly 2% of them trucks, projected to reach 217 by 2041. The structure is 114 ft (34.7 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesS Quarry Road
CrossesJacoby Creek
Location0.05 MI S Jacoby Creek RD
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.82708, -124.03886
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 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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length114 ft (34.7 m)
Longest span69 ft (21 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic115 (2011)
Projected traffic217 by 2041
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 S Quarry Road over Jacoby Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is S Quarry Road over Jacoby 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 June 2023.

How much traffic does S Quarry Road over Jacoby Creek carry?

About 115 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is S Quarry Road over Jacoby Creek?

The structure is 114 ft (34.7 m) long with a longest span of 69 ft (21 m) and a deck 14 ft wide.

Who owns S Quarry Road over Jacoby Creek?

It is owned by the County Highway Agency.