US Bridges

Mattole Road over Mcnutt Creek

Fair

Humboldt County, California · 3.6 MI NW of Petrolia · Structure no. 04C0243

Built
1996
29 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
101 ft
1 main span
Daily traffic
180
2011 count
Owner
County
County Highway Agency

About this bridge

Mattole Road over Mcnutt Creek is a prestressed concrete box beam or girders - single or spread carrying Mattole Road over Mcnutt Creek in Humboldt County, California. It was built in 1996, so it is 29 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 6 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 180 vehicles a day, roughly 4% of them trucks, projected to reach 463 by 2042. The structure is 101 ft (30.9 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMattole Road
CrossesMcnutt Creek
Location3.6 MI NW of Petrolia
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.35347, -124.36114
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length101 ft (30.9 m)
Longest span97 ft (29.7 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2011)
Projected traffic463 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Mattole Road over Mcnutt Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is Mattole Road over Mcnutt 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 March 2024.

How much traffic does Mattole Road over Mcnutt Creek carry?

About 180 vehicles per day (2011 count), of which roughly 4% are trucks.

How long is Mattole Road over Mcnutt Creek?

The structure is 101 ft (30.9 m) long with a longest span of 97 ft (29.7 m) and a deck 31 ft wide.

Who owns Mattole Road over Mcnutt Creek?

It is owned by the County Highway Agency.