US Bridges

Olema-Bolinas RD over Pine Gulch Creek

Fair

Marin County, California · 1.3 MI S of SR 1 · Structure no. 27C0116

Built
1986
39 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
42 ft
1 main span
Daily traffic
2,076
1983 count
Owner
County
County Highway Agency

About this bridge

Olema-Bolinas RD over Pine Gulch Creek is a concrete slab carrying Olema-Bolinas RD over Pine Gulch Creek in Marin County, California. It was built in 1986, so it is 39 years old, younger 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 2,076 vehicles a day, roughly 2% of them trucks, projected to reach 2,446 by 2042. The structure is 42 ft (12.8 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesOlema-Bolinas RD
CrossesPine Gulch Creek
Location1.3 MI S of SR 1
RouteCounty Highway 0
Coordinates37.9188, -122.69284
Functional classRural Major Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,076 (1983)
Projected traffic2,446 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Olema-Bolinas RD over Pine Gulch Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Olema-Bolinas RD over Pine Gulch 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 Olema-Bolinas RD over Pine Gulch Creek carry?

About 2,076 vehicles per day (1983 count), of which roughly 2% are trucks.

How long is Olema-Bolinas RD over Pine Gulch Creek?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 35 ft wide.

Who owns Olema-Bolinas RD over Pine Gulch Creek?

It is owned by the County Highway Agency.