US Bridges

State Park Road over Lagunitas Creek

FairPosted for load

Marin County, California · Samuel P Taylor State Pk · Structure no. 27P0001

Built
1947
78 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
120 ft
5 main spans
Daily traffic
50
1998 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

State Park Road over Lagunitas Creek is a steel continuous stringer/multi-beam or girder carrying State Park Road over Lagunitas Creek in Marin County, California. It was built in 1947, so it is 78 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for other load-capacity restriction.

It carries about 50 vehicles a day, projected to reach 77 by 2041. The structure is 120 ft (36.6 m) long and 33 ft wide.

Location

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CarriesState Park Road
CrossesLagunitas Creek
LocationSamuel P Taylor State Pk
RouteState Lands Road 0
CountyMarin County
StateCalifornia
Coordinates38.01855, -122.73311
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating24.7 US tons
Inventory rating14.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 10
Structure length120 ft (36.6 m)
Longest span47 ft (14.3 m)
Deck width33 ft (10.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1998)
Projected traffic77 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Park Road over Lagunitas Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is State Park Road over Lagunitas 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 State Park Road over Lagunitas Creek carry?

About 50 vehicles per day (1998 count).

How long is State Park Road over Lagunitas Creek?

The structure is 120 ft (36.6 m) long with a longest span of 47 ft (14.3 m) and a deck 33 ft wide.

Who owns State Park Road over Lagunitas Creek?

It is owned by the State Park, Forest, or Reservation Agency.