US Bridges

Nokomis Ave over San Anselmo Creek

Fair

Marin County, California · 300 Ft N Madrone Ave · Structure no. 27C0153

Built
1930
95 years old
Condition
Fair
inspected September 2024
Type
Girder and Floorbeam System
Concrete Continuous
Length
115 ft
4 main spans
Daily traffic
400
2011 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nokomis Ave over San Anselmo Creek is a concrete continuous girder and floorbeam system carrying Nokomis Ave over San Anselmo Creek in Marin County, California. It was built in 1930, so it is 95 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 400 vehicles a day, roughly 2% of them trucks, projected to reach 332 by 2046. The structure is 115 ft (35.1 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNokomis Ave
CrossesSan Anselmo Creek
Location300 Ft N Madrone Ave
RouteCity Street 0
CountyMarin County
StateCalifornia
Coordinates37.97866, -122.56685
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating27.9 US tons
Inventory rating16.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length115 ft (35.1 m)
Longest span39 ft (11.9 m)
Deck width30 ft (9.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2011)
Projected traffic332 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nokomis Ave over San Anselmo Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Nokomis Ave over San Anselmo Creek 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 September 2024.

How much traffic does Nokomis Ave over San Anselmo Creek carry?

About 400 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Nokomis Ave over San Anselmo Creek?

The structure is 115 ft (35.1 m) long with a longest span of 39 ft (11.9 m) and a deck 30 ft wide.

Who owns Nokomis Ave over San Anselmo Creek?

It is owned by the City or Municipal Highway Agency.