US Bridges

Norwood Ave over Ross Creek

Good

Marin County, California · 0.1 MI North of Shady LN · Structure no. 27C0149

Built
1908
117 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
50 ft
3 main spans
Daily traffic
1,200
2004 count
Owner
City
City or Municipal Highway Agency

About this bridge

Norwood Ave over Ross Creek is a concrete continuous slab carrying Norwood Ave over Ross Creek in Marin County, California. It was built in 1908, so it is 117 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 1,200 vehicles a day, roughly 2% of them trucks, projected to reach 1,744 by 2041. The structure is 50 ft (15.2 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNorwood Ave
CrossesRoss Creek
Location0.1 MI North of Shady LN
RouteCity Street 0
CountyMarin County
StateCalifornia
Coordinates37.96592, -122.56276
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating30.8 US tons
Inventory rating18.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span26 ft (7.8 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2004)
Projected traffic1,744 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Norwood Ave over Ross Creek built?

It was built in 1908, making it 117 years old in 2025.

What condition is Norwood Ave over Ross 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 2023.

How much traffic does Norwood Ave over Ross Creek carry?

About 1,200 vehicles per day (2004 count), of which roughly 2% are trucks.

How long is Norwood Ave over Ross Creek?

The structure is 50 ft (15.2 m) long with a longest span of 26 ft (7.8 m) and a deck 20 ft wide.

Who owns Norwood Ave over Ross Creek?

It is owned by the City or Municipal Highway Agency.