US Bridges

Simmons Ave over Novato Creek

Good

Marin County, California · 0.2 MI NE Novato Bl · Structure no. 27C0090

Built
1932
93 years old, rebuilt 2007
Condition
Good
inspected July 2022
Type
Tee Beam
Concrete
Length
51 ft
1 main span
Daily traffic
7,037
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Simmons Ave over Novato Creek is a concrete tee beam carrying Simmons Ave over Novato Creek in Marin County, California. It was built in 1932 and reconstructed in 2007, so it is 93 years old, older 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 7,037 vehicles a day, roughly 10% of them trucks, projected to reach 7,182 by 2040. The structure is 51 ft (15.5 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSimmons Ave
CrossesNovato Creek
Location0.2 MI NE Novato Bl
RouteCity Street 0
Coordinates38.11373, -122.588
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating77.5 US tons
Inventory rating46.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length51 ft (15.5 m)
Longest span36 ft (11 m)
Deck width47 ft (14.4 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,037 (2010)
Projected traffic7,182 by 2040
Trucks10%
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 Simmons Ave over Novato Creek built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 2007.

What condition is Simmons Ave over Novato 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 Simmons Ave over Novato Creek carry?

About 7,037 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is Simmons Ave over Novato Creek?

The structure is 51 ft (15.5 m) long with a longest span of 36 ft (11 m) and a deck 47 ft wide.

Who owns Simmons Ave over Novato Creek?

It is owned by the City or Municipal Highway Agency.