US Bridges

U.S. Highway 101 over Benbow DR (old US 101)

Fair

Humboldt County, California · 01-HUM-101-R7.77 · Structure no. 04 0216

Built
1975
50 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
235 ft
3 main spans
Daily traffic
5,700
2014 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Benbow DR (old US 101) is a concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over Benbow DR (old US 101) in Humboldt County, California. It was built in 1975, so it is 50 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 5,700 vehicles a day, roughly 16% of them trucks, projected to reach 6,057 by 2041. The structure is 235 ft (71.6 m) long and 62 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

CarriesU.S. Highway 101
CrossesBenbow DR (old US 101)
Location01-HUM-101-R7.77
RouteU.S. Route 101
Coordinates40.05644, -123.79037
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating61.8 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length235 ft (71.6 m)
Longest span108 ft (32.9 m)
Deck width62 ft (18.9 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2014)
Projected traffic6,057 by 2041
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed60.3 mi (97 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was U.S. Highway 101 over Benbow DR (old US 101) built?

It was built in 1975, making it 50 years old in 2025.

What condition is U.S. Highway 101 over Benbow DR (old US 101) 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 September 2024.

How much traffic does U.S. Highway 101 over Benbow DR (old US 101) carry?

About 5,700 vehicles per day (2014 count), of which roughly 16% are trucks.

How long is U.S. Highway 101 over Benbow DR (old US 101)?

The structure is 235 ft (71.6 m) long with a longest span of 108 ft (32.9 m) and a deck 62 ft wide.

Who owns U.S. Highway 101 over Benbow DR (old US 101)?

It is owned by the State Highway Agency.