US Bridges

U.S. Highway 101 over Lincoln AVE-N101 on Ramp

Fair

Marin County, California · 04-MRN-101-12.19-SRF · Structure no. 27 0030

Built
1938
87 years old, rebuilt 2009
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
180,000
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Lincoln AVE-N101 on Ramp is a prestressed concrete continuous slab carrying U.S. Highway 101 over Lincoln AVE-N101 on Ramp in Marin County, California. It was built in 1938 and reconstructed in 2009, so it is 87 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 180,000 vehicles a day, projected to reach 266,282 by 2045. The structure is 93 ft (28.2 m) long and 127 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesU.S. Highway 101
CrossesLincoln AVE-N101 on Ramp
Location04-MRN-101-12.19-SRF
RouteU.S. Route 101
CountyMarin County
StateCalifornia
Coordinates37.98836, -122.52683
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating27.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length93 ft (28.2 m)
Longest span51 ft (15.4 m)
Deck width127 ft (38.7 m)
Roadway width122 ft (37.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180,000 (2009)
Projected traffic266,282 by 2045
Trucks0%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 U.S. Highway 101 over Lincoln AVE-N101 on Ramp built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 2009.

What condition is U.S. Highway 101 over Lincoln AVE-N101 on 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 April 2023.

How much traffic does U.S. Highway 101 over Lincoln AVE-N101 on Ramp carry?

About 180,000 vehicles per day (2009 count).

How long is U.S. Highway 101 over Lincoln AVE-N101 on Ramp?

The structure is 93 ft (28.2 m) long with a longest span of 51 ft (15.4 m) and a deck 127 ft wide.

Who owns U.S. Highway 101 over Lincoln AVE-N101 on Ramp?

It is owned by the State Highway Agency.