US Bridges

Pt Reyes Petlma RD over Nicasio Creek

Fair

Marin County, California · 3.2 MI E of SR 1 · Structure no. 27C0035

Built
1937
88 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
6,000
2012 count
Owner
County
County Highway Agency

About this bridge

Pt Reyes Petlma RD over Nicasio Creek is a concrete continuous tee beam carrying Pt Reyes Petlma RD over Nicasio Creek in Marin County, California. It was built in 1937, so it is 88 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 6,000 vehicles a day, roughly 10% of them trucks, projected to reach 8,905 by 2045. The structure is 102 ft (31.1 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesPt Reyes Petlma RD
CrossesNicasio Creek
Location3.2 MI E of SR 1
RouteCounty Highway 0
CountyMarin County
StateCalifornia
Coordinates38.06921, -122.76405
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length102 ft (31.1 m)
Longest span34 ft (10.4 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2012)
Projected traffic8,905 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Pt Reyes Petlma RD over Nicasio Creek built?

It was built in 1937, making it 88 years old in 2025.

What condition is Pt Reyes Petlma RD over Nicasio 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 August 2023.

How much traffic does Pt Reyes Petlma RD over Nicasio Creek carry?

About 6,000 vehicles per day (2012 count), of which roughly 10% are trucks.

How long is Pt Reyes Petlma RD over Nicasio Creek?

The structure is 102 ft (31.1 m) long with a longest span of 34 ft (10.4 m) and a deck 28 ft wide.

Who owns Pt Reyes Petlma RD over Nicasio Creek?

It is owned by the County Highway Agency.