US Bridges

U.S. Highway 101 over Boyd Draw

Fair

Humboldt County, California · 01-HUM-101-89.44 · Structure no. 04 0085

Built
1959
66 years old, rebuilt 1991
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
133 ft
5 main spans
Daily traffic
12,900
2010 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Boyd Draw is a concrete continuous slab carrying U.S. Highway 101 over Boyd Draw in Humboldt County, California. It was built in 1959 and reconstructed in 1991, so it is 66 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 12,900 vehicles a day, roughly 10% of them trucks, projected to reach 34,852 by 2041. The structure is 133 ft (40.4 m) long and 89 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesU.S. Highway 101
CrossesBoyd Draw
Location01-HUM-101-89.44
RouteU.S. Route 101
CountyHumboldt County
StateCalifornia
Coordinates40.91322, -124.09109
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length133 ft (40.4 m)
Longest span27 ft (8.1 m)
Deck width89 ft (27.1 m)
Roadway width83 ft (25.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,900 (2010)
Projected traffic34,852 by 2041
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 U.S. Highway 101 over Boyd Draw built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1991.

What condition is U.S. Highway 101 over Boyd Draw 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 November 2023.

How much traffic does U.S. Highway 101 over Boyd Draw carry?

About 12,900 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is U.S. Highway 101 over Boyd Draw?

The structure is 133 ft (40.4 m) long with a longest span of 27 ft (8.1 m) and a deck 89 ft wide.

Who owns U.S. Highway 101 over Boyd Draw?

It is owned by the State Highway Agency.