US Bridges

Chambers Road over Mill Creek

Fair

Humboldt County, California · 0.7 MI E of Mattole RD · Structure no. 04C0264

Built
2015
10 years old
Condition
Fair
inspected June 2024
Type
Girder and Floorbeam System
Steel
Length
60 ft
1 main span
Daily traffic
500
2024 count
Owner
County
County Highway Agency

About this bridge

Chambers Road over Mill Creek is a steel girder and floorbeam system carrying Chambers Road over Mill Creek in Humboldt County, California. It was built in 2015, so it is 10 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 500 vehicles a day, roughly 3% of them trucks, projected to reach 700 by 2044. The structure is 60 ft (18.3 m) long and 11 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesChambers Road
CrossesMill Creek
Location0.7 MI E of Mattole RD
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.32131, -124.27306
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span37 ft (11.2 m)
Deck width11 ft (3.5 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2024)
Projected traffic700 by 2044
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Chambers Road over Mill Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is Chambers Road over Mill 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 2024.

How much traffic does Chambers Road over Mill Creek carry?

About 500 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Chambers Road over Mill Creek?

The structure is 60 ft (18.3 m) long with a longest span of 37 ft (11.2 m) and a deck 11 ft wide.

Who owns Chambers Road over Mill Creek?

It is owned by the County Highway Agency.