US Bridges

US Highway 101 NB over Tennessee Hollow

Good

San Francisco County, California · 04-SF-101-R8.34-SF · Structure no. 34 0164R

Built
2015
10 years old
Condition
Good
inspected March 2023
Type
Slab
Prestressed Concrete Continuous
Length
411 ft
8 main spans
Daily traffic
39,500
2019 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 NB over Tennessee Hollow is a prestressed concrete continuous slab carrying US Highway 101 NB over Tennessee Hollow in San Francisco County, California. It was built in 2015, so it is 10 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 39,500 vehicles a day, roughly 1% of them trucks, projected to reach 55,500 by 2045. The structure is 411 ft (125.4 m) long and 40 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesUS Highway 101 NB
CrossesTennessee Hollow
Location04-SF-101-R8.34-SF
RouteU.S. Route 101
Coordinates37.80347, -122.45219
Functional classUrban Other Principal Arterial

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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length411 ft (125.4 m)
Longest span60 ft (18.3 m)
Deck width40 ft (12.3 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39,500 (2019)
Projected traffic55,500 by 2045
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 US Highway 101 NB over Tennessee Hollow built?

It was built in 2015, making it 10 years old in 2025.

What condition is US Highway 101 NB over Tennessee Hollow 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 March 2023.

How much traffic does US Highway 101 NB over Tennessee Hollow carry?

About 39,500 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is US Highway 101 NB over Tennessee Hollow?

The structure is 411 ft (125.4 m) long with a longest span of 60 ft (18.3 m) and a deck 40 ft wide.

Who owns US Highway 101 NB over Tennessee Hollow?

It is owned by the State Highway Agency.