US Bridges

Holmes Flat RD over Larabee Creek

Good

Humboldt County, California · 2.5 MI E Ave of Giants · Structure no. 04C0099

Built
1966
59 years old
Condition
Good
inspected February 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
303 ft
3 main spans
Daily traffic
17
2011 count
Owner
County
County Highway Agency

About this bridge

Holmes Flat RD over Larabee Creek is a concrete continuous box beam or girders - multiple carrying Holmes Flat RD over Larabee Creek in Humboldt County, California. It was built in 1966, so it is 59 years old, older 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 17 vehicles a day, roughly 1% of them trucks, projected to reach 27 by 2042. The structure is 303 ft (92.4 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesHolmes Flat RD
CrossesLarabee Creek
Location2.5 MI E Ave of Giants
RouteCounty Highway 0
Coordinates40.40994, -123.92896
Functional classRural Local

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 inspectionFebruary 2024
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 geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length303 ft (92.4 m)
Longest span120 ft (36.6 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17 (2011)
Projected traffic27 by 2042
Trucks1%
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 Holmes Flat RD over Larabee Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Holmes Flat RD over Larabee Creek 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 February 2024.

How much traffic does Holmes Flat RD over Larabee Creek carry?

About 17 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Holmes Flat RD over Larabee Creek?

The structure is 303 ft (92.4 m) long with a longest span of 120 ft (36.6 m) and a deck 16 ft wide.

Who owns Holmes Flat RD over Larabee Creek?

It is owned by the County Highway Agency.