US Bridges

U.S. Highway 101 over Bear Butte Road

Good

Humboldt County, California · 01-HUM-101-23.01 · Structure no. 04 0175

Built
1962
63 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
135 ft
3 main spans
Daily traffic
5,100
2014 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Bear Butte Road is a concrete continuous tee beam carrying U.S. Highway 101 over Bear Butte Road in Humboldt County, California. It was built in 1962, so it is 63 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,100 vehicles a day, roughly 16% of them trucks, projected to reach 6,892 by 2041. The structure is 135 ft (41.1 m) long and 63 ft wide. If it were closed, the detour would be 41 mi (66 km).

CarriesU.S. Highway 101
CrossesBear Butte Road
Location01-HUM-101-23.01
RouteU.S. Route 101
Coordinates40.22346, -123.82631
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than 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 rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length135 ft (41.1 m)
Longest span55 ft (16.8 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,100 (2014)
Projected traffic6,892 by 2041
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed41 mi (66 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 Bear Butte Road built?

It was built in 1962, making it 63 years old in 2025.

What condition is U.S. Highway 101 over Bear Butte Road in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does U.S. Highway 101 over Bear Butte Road carry?

About 5,100 vehicles per day (2014 count), of which roughly 16% are trucks.

How long is U.S. Highway 101 over Bear Butte Road?

The structure is 135 ft (41.1 m) long with a longest span of 55 ft (16.8 m) and a deck 63 ft wide.

Who owns U.S. Highway 101 over Bear Butte Road?

It is owned by the State Highway Agency.