US Bridges

State Route 1 over Olema Creek Tributary

Good

Marin County, California · 04-MRN-001-24.67 · Structure no. 27 0120

Built
2018
7 years old
Condition
Good
inspected May 2024
Type
Slab
Concrete
Length
36 ft
1 main span
Daily traffic
3,650
2017 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Olema Creek Tributary is a concrete slab carrying State Route 1 over Olema Creek Tributary in Marin County, California. It was built in 2018, so it is 7 years old, younger 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 3,650 vehicles a day, roughly 4% of them trucks, projected to reach 4,591 by 2042. The structure is 36 ft (10.9 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesState Route 1
CrossesOlema Creek Tributary
Location04-MRN-001-24.67
RouteState Highway 1
Coordinates38.01914, -122.77158
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionMay 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length36 ft (10.9 m)
Longest span33 ft (10 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,650 (2017)
Projected traffic4,591 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 1 over Olema Creek Tributary built?

It was built in 2018, making it 7 years old in 2025.

What condition is State Route 1 over Olema Creek Tributary 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 May 2024.

How much traffic does State Route 1 over Olema Creek Tributary carry?

About 3,650 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is State Route 1 over Olema Creek Tributary?

The structure is 36 ft (10.9 m) long with a longest span of 33 ft (10 m) and a deck 36 ft wide.

Who owns State Route 1 over Olema Creek Tributary?

It is owned by the State Highway Agency.