US Bridges

U.S. Highway 101 over Redwood Creek

Good

Humboldt County, California · 01-HUM-101-121.09 · Structure no. 04 0028

Built
1988
37 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
370 ft
2 main spans
Daily traffic
3,750
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Redwood Creek is a prestressed concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over Redwood Creek in Humboldt County, California. It was built in 1988, so it is 37 years old, younger 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 370 ft (112.8 m) long and 55 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesU.S. Highway 101
CrossesRedwood Creek
Location01-HUM-101-121.09
RouteU.S. Route 101
Coordinates41.28796, -124.05877
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length370 ft (112.8 m)
Longest span185 ft (56.4 m)
Deck width55 ft (16.9 m)
Roadway width40 ft (12.2 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 and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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 built?

It was built in 1988, making it 37 years old in 2025.

What condition is U.S. Highway 101 over Redwood Creek 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 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?

The structure is 370 ft (112.8 m) long with a longest span of 185 ft (56.4 m) and a deck 55 ft wide.

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

It is owned by the State Highway Agency.