US Bridges

Mattole RD over Bull Creek

Fair

Humboldt County, California · 5.3 MI W/O HWY 101 · Structure no. 04P0004

Built
1956
69 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Concrete
Length
85 ft
1 main span
Daily traffic
310
2009 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Mattole RD over Bull Creek is a concrete tee beam carrying Mattole RD over Bull Creek in Humboldt County, California. It was built in 1956, so it is 69 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 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 310 vehicles a day, roughly 10% of them trucks, projected to reach 508 by 2046. The structure is 85 ft (25.9 m) long and 27 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

Open in Google Maps
CarriesMattole RD
CrossesBull Creek
Location5.3 MI W/O HWY 101
RouteState Lands Road 0
CountyHumboldt County
StateCalifornia
Coordinates40.35125, -124.00564
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span80 ft (24.4 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic310 (2009)
Projected traffic508 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation 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 RD over Bull Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Mattole RD over Bull 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 RD over Bull Creek carry?

About 310 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is Mattole RD over Bull Creek?

The structure is 85 ft (25.9 m) long with a longest span of 80 ft (24.4 m) and a deck 27 ft wide.

Who owns Mattole RD over Bull Creek?

It is owned by the State Park, Forest, or Reservation Agency.