US Bridges

S Novato Blvd over W37-S101 Connector Ramp

Fair

Marin County, California · 04-MRN-101-18.94-NVTO · Structure no. 27 0086K

Built
1964
61 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
160 ft
3 main spans
Daily traffic
12,500
1998 count
Owner
State
State Highway Agency

About this bridge

S Novato Blvd over W37-S101 Connector Ramp is a concrete continuous box beam or girders - multiple carrying S Novato Blvd over W37-S101 Connector Ramp in Marin County, California. It was built in 1964, so it is 61 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 12,500 vehicles a day, roughly 7% of them trucks, projected to reach 17,330 by 2041. The structure is 160 ft (48.8 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS Novato Blvd
CrossesW37-S101 Connector Ramp
Location04-MRN-101-18.94-NVTO
RouteU.S. Route 101
CountyMarin County
StateCalifornia
Coordinates38.07729, -122.54591
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.3 US tons
Inventory rating29.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span66 ft (20.1 m)
Deck width26 ft (8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,500 (1998)
Projected traffic17,330 by 2041
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 S Novato Blvd over W37-S101 Connector Ramp built?

It was built in 1964, making it 61 years old in 2025.

What condition is S Novato Blvd over W37-S101 Connector Ramp in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does S Novato Blvd over W37-S101 Connector Ramp carry?

About 12,500 vehicles per day (1998 count), of which roughly 7% are trucks.

How long is S Novato Blvd over W37-S101 Connector Ramp?

The structure is 160 ft (48.8 m) long with a longest span of 66 ft (20.1 m) and a deck 26 ft wide.

Who owns S Novato Blvd over W37-S101 Connector Ramp?

It is owned by the State Highway Agency.