US Bridges

U.S. Highway 101 over Smith River Overflow

Good

Del Norte County, California · 01-DN-101-35.77 · Structure no. 01 0046

Built
1955
70 years old, rebuilt 2007
Condition
Good
inspected August 2021
Type
Slab
Concrete Continuous
Length
283 ft
10 main spans
Daily traffic
6,700
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Smith River Overflow is a concrete continuous slab carrying U.S. Highway 101 over Smith River Overflow in Del Norte County, California. It was built in 1955 and reconstructed in 2007, so it is 70 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 6,700 vehicles a day, roughly 6% of them trucks, projected to reach 9,182 by 2041. The structure is 283 ft (86.3 m) long and 50 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesU.S. Highway 101
CrossesSmith River Overflow
Location01-DN-101-35.77
RouteU.S. Route 101
Coordinates41.87381, -124.13839
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length283 ft (86.3 m)
Longest span28 ft (8.5 m)
Deck width50 ft (15.2 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,700 (2009)
Projected traffic9,182 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Smith River Overflow built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2007.

What condition is U.S. Highway 101 over Smith River 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 August 2021.

How much traffic does U.S. Highway 101 over Smith River Overflow carry?

About 6,700 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is U.S. Highway 101 over Smith River Overflow?

The structure is 283 ft (86.3 m) long with a longest span of 28 ft (8.5 m) and a deck 50 ft wide.

Who owns U.S. Highway 101 over Smith River Overflow?

It is owned by the State Highway Agency.