US Bridges

Grand Ave over San Rafael Creek

Fair

Marin County, California · 500 Ft E of US HWY 101 · Structure no. 27C0019

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
242 ft
8 main spans
Daily traffic
19,800
1977 count
Owner
City
City or Municipal Highway Agency

About this bridge

Grand Ave over San Rafael Creek is a concrete continuous slab carrying Grand Ave over San Rafael Creek in Marin County, California. It was built in 1965, so it is 60 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 19,800 vehicles a day, roughly 10% of them trucks, projected to reach 24,391 by 2041. The structure is 242 ft (73.8 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGrand Ave
CrossesSan Rafael Creek
Location500 Ft E of US HWY 101
RouteCity Street 0
CountyMarin County
StateCalifornia
Coordinates37.96912, -122.51922
Functional classUrban Minor Arterial

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20 + Mod
Structure length242 ft (73.8 m)
Longest span30 ft (9.1 m)
Deck width47 ft (14.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,800 (1977)
Projected traffic24,391 by 2041
Trucks10%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Grand Ave over San Rafael Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Grand Ave over San Rafael 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 July 2023.

How much traffic does Grand Ave over San Rafael Creek carry?

About 19,800 vehicles per day (1977 count), of which roughly 10% are trucks.

How long is Grand Ave over San Rafael Creek?

The structure is 242 ft (73.8 m) long with a longest span of 30 ft (9.1 m) and a deck 47 ft wide.

Who owns Grand Ave over San Rafael Creek?

It is owned by the City or Municipal Highway Agency.