US Bridges

Route 101 SB over Rush Landing RD & Nwp RR

Good

Marin County, California · 04-MRN-101-R22.24-NVTO · Structure no. 27 0094L

Built
1974
51 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
445 ft
4 main spans
Daily traffic
61,500
2009 count
Owner
State
State Highway Agency

About this bridge

Route 101 SB over Rush Landing RD & Nwp RR is a prestressed concrete continuous box beam or girders - multiple carrying Route 101 SB over Rush Landing RD & Nwp RR in Marin County, California. It was built in 1974, so it is 51 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 61,500 vehicles a day, roughly 5% of them trucks, projected to reach 77,824 by 2045. The structure is 445 ft (135.6 m) long and 54 ft wide. If it were closed, the detour would be 28 mi (45 km).

CarriesRoute 101 SB
CrossesRush Landing RD & Nwp RR
Location04-MRN-101-R22.24-NVTO
RouteU.S. Route 101
Coordinates38.12113, -122.56577
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 inspectionMay 2023
Inspection intervalevery 24 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 alignment8: Equal to present desirable criteria
Operating rating98.9 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length445 ft (135.6 m)
Longest span114 ft (34.7 m)
Deck width54 ft (16.5 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic61,500 (2009)
Projected traffic77,824 by 2045
Trucks5%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed28 mi (45 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 Route 101 SB over Rush Landing RD & Nwp RR built?

It was built in 1974, making it 51 years old in 2025.

What condition is Route 101 SB over Rush Landing RD & Nwp RR 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 May 2023.

How much traffic does Route 101 SB over Rush Landing RD & Nwp RR carry?

About 61,500 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is Route 101 SB over Rush Landing RD & Nwp RR?

The structure is 445 ft (135.6 m) long with a longest span of 114 ft (34.7 m) and a deck 54 ft wide.

Who owns Route 101 SB over Rush Landing RD & Nwp RR?

It is owned by the State Highway Agency.