US Bridges

Sir Francis Drake over Olema Creek

Good

Marin County, California · 0.32 MI W SH 1 · Structure no. 27C0104

Built
1930
95 years old, rebuilt 1967
Condition
Good
inspected August 2023
Type
Slab
Concrete
Length
58 ft
3 main spans
Daily traffic
3,000
2012 count
Owner
County
County Highway Agency

About this bridge

Sir Francis Drake over Olema Creek is a concrete slab carrying Sir Francis Drake over Olema Creek in Marin County, California. It was built in 1930 and reconstructed in 1967, 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 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 3,000 vehicles a day, roughly 2% of them trucks, projected to reach 3,480 by 2045. The structure is 58 ft (17.7 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSir Francis Drake
CrossesOlema Creek
Location0.32 MI W SH 1
RouteCounty Highway 0
Coordinates38.06389, -122.81052
Functional classRural Major 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating30.8 US tons
Inventory rating18.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span20 ft (6.1 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2012)
Projected traffic3,480 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Sir Francis Drake over Olema Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1967.

What condition is Sir Francis Drake over Olema 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 August 2023.

How much traffic does Sir Francis Drake over Olema Creek carry?

About 3,000 vehicles per day (2012 count), of which roughly 2% are trucks.

How long is Sir Francis Drake over Olema Creek?

The structure is 58 ft (17.7 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns Sir Francis Drake over Olema Creek?

It is owned by the County Highway Agency.