US Bridges

Marin DR over Fairfax Creek

Fair

Marin County, California · At Bothin RD · Structure no. 27C0143

Built
1930
95 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Concrete
Length
41 ft
1 main span
Daily traffic
110
2004 count
Owner
City
City or Municipal Highway Agency

About this bridge

Marin DR over Fairfax Creek is a concrete arch - deck carrying Marin DR over Fairfax 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 110 vehicles a day, roughly 2% of them trucks, projected to reach 133 by 2044. The structure is 41 ft (12.5 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMarin DR
CrossesFairfax Creek
LocationAt Bothin RD
RouteCity Street 0
Coordinates37.99334, -122.59469
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span27 ft (8.2 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2004)
Projected traffic133 by 2044
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 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 Marin DR over Fairfax Creek built?

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

What condition is Marin DR over Fairfax 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 Marin DR over Fairfax Creek carry?

About 110 vehicles per day (2004 count), of which roughly 2% are trucks.

How long is Marin DR over Fairfax Creek?

The structure is 41 ft (12.5 m) long with a longest span of 27 ft (8.2 m) and a deck 27 ft wide.

Who owns Marin DR over Fairfax Creek?

It is owned by the City or Municipal Highway Agency.