US Bridges

U.S. Highway 101 over Redwood Creek Overflow

Good

Humboldt County, California · 01-HUM-101-120.02 · Structure no. 04 0034

Built
1950
75 years old
Condition
Good
inspected July 2024
Type
Slab
Concrete Continuous
Length
65 ft
3 main spans
Daily traffic
3,750
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Redwood Creek Overflow is a concrete continuous slab carrying U.S. Highway 101 over Redwood Creek Overflow in Humboldt County, California. It was built in 1950, so it is 75 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 3,750 vehicles a day, roughly 14% of them trucks, projected to reach 5,620 by 2042. The structure is 65 ft (19.8 m) long and 42 ft wide. If it were closed, the detour would be 57.2 mi (92 km).

CarriesU.S. Highway 101
CrossesRedwood Creek Overflow
Location01-HUM-101-120.02
RouteU.S. Route 101
Coordinates41.28508, -124.07758
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating57.5 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span32 ft (9.8 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,750 (2009)
Projected traffic5,620 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed57.2 mi (92 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 Redwood Creek Overflow built?

It was built in 1950, making it 75 years old in 2025.

What condition is U.S. Highway 101 over Redwood Creek Overflow 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 July 2024.

How much traffic does U.S. Highway 101 over Redwood Creek Overflow carry?

About 3,750 vehicles per day (2009 count), of which roughly 14% are trucks.

How long is U.S. Highway 101 over Redwood Creek Overflow?

The structure is 65 ft (19.8 m) long with a longest span of 32 ft (9.8 m) and a deck 42 ft wide.

Who owns U.S. Highway 101 over Redwood Creek Overflow?

It is owned by the State Highway Agency.