US Bridges

Tamalpais Ave over Warner Creek

Good

Marin County, California · 0.1 MI SW Novato Blvd · Structure no. 27C0091

Built
1973
52 years old
Condition
Good
inspected July 2022
Type
Slab
Concrete
Length
36 ft
1 main span
Daily traffic
4,458
2009 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tamalpais Ave over Warner Creek is a concrete slab carrying Tamalpais Ave over Warner Creek in Marin County, California. It was built in 1973, so it is 52 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 4,458 vehicles a day, roughly 8% of them trucks, projected to reach 6,048 by 2044. The structure is 36 ft (11 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesTamalpais Ave
CrossesWarner Creek
Location0.1 MI SW Novato Blvd
RouteCity Street 0
CountyMarin County
StateCalifornia
Coordinates38.10478, -122.57998
Functional classUrban Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating71.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span33 ft (10.1 m)
Deck width46 ft (13.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,458 (2009)
Projected traffic6,048 by 2044
Trucks8%
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 Tamalpais Ave over Warner Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Tamalpais Ave over Warner Creek 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 July 2022.

How much traffic does Tamalpais Ave over Warner Creek carry?

About 4,458 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Tamalpais Ave over Warner Creek?

The structure is 36 ft (11 m) long with a longest span of 33 ft (10.1 m) and a deck 46 ft wide.

Who owns Tamalpais Ave over Warner Creek?

It is owned by the City or Municipal Highway Agency.