US Bridges

Coffee Creek Road over Perry Slough

Fair

Humboldt County, California · 0.2 MI South of RTE 211 · Structure no. 04C0170

Built
1931
94 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete
Length
90 ft
3 main spans
Daily traffic
254
2015 count
Owner
County
County Highway Agency

About this bridge

Coffee Creek Road over Perry Slough is a concrete tee beam carrying Coffee Creek Road over Perry Slough in Humboldt County, California. It was built in 1931, so it is 94 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 254 vehicles a day, roughly 2% of them trucks, projected to reach 255 by 2042. The structure is 90 ft (27.4 m) long and 22 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCoffee Creek Road
CrossesPerry Slough
Location0.2 MI South of RTE 211
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.59558, -124.23071
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic254 (2015)
Projected traffic255 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Coffee Creek Road over Perry Slough built?

It was built in 1931, making it 94 years old in 2025.

What condition is Coffee Creek Road over Perry Slough 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 August 2024.

How much traffic does Coffee Creek Road over Perry Slough carry?

About 254 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Coffee Creek Road over Perry Slough?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns Coffee Creek Road over Perry Slough?

It is owned by the County Highway Agency.