US Bridges

Holmes Flat Road over Larabee Low Level-Eel Ri

PoorClosed to traffic

Humboldt County, California · Near Holmes · Structure no. 04C0171

Built
1960
65 years old
Condition
Poor
inspected February 2024
Type
Slab
Concrete Continuous
Length
401 ft
25 main spans
Daily traffic
100
2011 count
Owner
County
County Highway Agency

About this bridge

Holmes Flat Road over Larabee Low Level-Eel Ri is a concrete continuous slab carrying Holmes Flat Road over Larabee Low Level-Eel Ri in Humboldt County, California. It was built in 1960, so it is 65 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 100 vehicles a day, roughly 20% of them trucks, projected to reach 156 by 2042. The structure is 401 ft (122.3 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesHolmes Flat Road
CrossesLarabee Low Level-Eel Ri
LocationNear Holmes
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.41674, -123.93564
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.1 US tons
Inventory rating15.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans25
Design loadUnknown
Structure length401 ft (122.3 m)
Longest span16 ft (4.9 m)
Deck width12 ft (3.7 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2011)
Projected traffic156 by 2042
Trucks20%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Holmes Flat Road over Larabee Low Level-Eel Ri built?

It was built in 1960, making it 65 years old in 2025.

What condition is Holmes Flat Road over Larabee Low Level-Eel Ri in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does Holmes Flat Road over Larabee Low Level-Eel Ri carry?

About 100 vehicles per day (2011 count), of which roughly 20% are trucks.

How long is Holmes Flat Road over Larabee Low Level-Eel Ri?

The structure is 401 ft (122.3 m) long with a longest span of 16 ft (4.9 m) and a deck 12 ft wide.

Who owns Holmes Flat Road over Larabee Low Level-Eel Ri?

It is owned by the County Highway Agency.