US Bridges

S101-E37 & Novato- over U.S. Highway 101

Good

Marin County, California · 04-MRN-101-18.88-NVTO · Structure no. 27 0085F

Built
1964
61 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
305 ft
5 main spans
Daily traffic
15,000
1998 count
Owner
State
State Highway Agency

About this bridge

S101-E37 & Novato- over U.S. Highway 101 is a concrete continuous box beam or girders - multiple carrying S101-E37 & Novato- over U.S. Highway 101 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 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 15,000 vehicles a day, roughly 4% of them trucks, projected to reach 34,661 by 2041. The structure is 305 ft (93 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS101-E37 & Novato-
CrossesU.S. Highway 101
Location04-MRN-101-18.88-NVTO
RouteU.S. Route 101
Coordinates38.07746, -122.54406
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79.3 US tons
Inventory rating47.5 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length305 ft (93 m)
Longest span75 ft (22.9 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (1998)
Projected traffic34,661 by 2041
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 S101-E37 & Novato- over U.S. Highway 101 built?

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

What condition is S101-E37 & Novato- over U.S. Highway 101 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 June 2023.

How much traffic does S101-E37 & Novato- over U.S. Highway 101 carry?

About 15,000 vehicles per day (1998 count), of which roughly 4% are trucks.

How long is S101-E37 & Novato- over U.S. Highway 101?

The structure is 305 ft (93 m) long with a longest span of 75 ft (22.9 m) and a deck 34 ft wide.

Who owns S101-E37 & Novato- over U.S. Highway 101?

It is owned by the State Highway Agency.