US Bridges

W37-N101 Connector over Novato BL-N101 Nwp RR

Fair

Marin County, California · 04-MRN-037-R11.23-NVTO · Structure no. 27 0081F

Built
1964
61 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
662 ft
8 main spans
Daily traffic
3,800
2020 count
Owner
State
State Highway Agency

About this bridge

W37-N101 Connector over Novato BL-N101 Nwp RR is a concrete continuous box beam or girders - multiple carrying W37-N101 Connector over Novato BL-N101 Nwp RR 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 5 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 3,800 vehicles a day, roughly 2% of them trucks, projected to reach 5,858 by 2042. The structure is 662 ft (201.8 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesW37-N101 Connector
CrossesNovato BL-N101 Nwp RR
Location04-MRN-037-R11.23-NVTO
RouteState Highway 37
CountyMarin County
StateCalifornia
Coordinates38.08137, -122.54625
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20 + Mod
Structure length662 ft (201.8 m)
Longest span90 ft (27.4 m)
Deck width26 ft (8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2020)
Projected traffic5,858 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 W37-N101 Connector over Novato BL-N101 Nwp RR built?

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

What condition is W37-N101 Connector over Novato BL-N101 Nwp RR 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 May 2024.

How much traffic does W37-N101 Connector over Novato BL-N101 Nwp RR carry?

About 3,800 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is W37-N101 Connector over Novato BL-N101 Nwp RR?

The structure is 662 ft (201.8 m) long with a longest span of 90 ft (27.4 m) and a deck 26 ft wide.

Who owns W37-N101 Connector over Novato BL-N101 Nwp RR?

It is owned by the State Highway Agency.