Marin County, CA

217 public highway bridges

Marin County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Marin County, California contains 217 public highway bridges. Roughly 34.6% are rated “Good,” 35% “Fair,” and 8.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

217
Total Bridges
34.6%
Good
35%
Fair
8.3%
Poor Condition

Condition Distribution

Good
34.6% (75)
Fair
35% (76)
Poor
8.3% (18)

All Bridges (217)

3RD ST

Good

Over: IRWIN CREEK

AT HETHERTON ST, Marin, CA

Built 1968 Load: 24.3 t ADT: 20,000

PACIFIC WAY

Good

Over: REDWOOD CREEK

0.09 MI S SR 1, Marin, CA

Built 1956 Load: 24.3 t ADT: 75

LA GOMA ST

Good

Over: AYO CORTE MADERA DEL PRE

300 FT N OF MILLER AVE, Marin, CA

Built 1950 Load: 24.3 t ADT: 3,000

W CASTLEWOOD DRIVE

Good

Over: SAN RAFAEL BAY INLET

SW OF KNIGHT DRIVE, Marin, CA

Built 1965 Load: 24.3 t ADT: 500

STATE ROUTE 1

Good

Over: HILLSIDE

04-MRN-001-11.62, Marin, CA

Built 1982 Load: 25.3 t ADT: 4,100

U.S. HIGHWAY 101

Good

Over: WORNUM DRIVE

04-MRN-101-8.02-CMAD, Marin, CA

Built 1929 Load: 26.6 t ADT: 172,000

U.S. HIGHWAY 101

Good

Over: HILLSIDE

04-MRN-101-1.09-SAUS, Marin, CA

Built 1954 Load: 28.8 t ADT: 53,000

NICASIO VAL RD

Good

Over: ARROYO NICASIO

NEAR LUCAS VALLEY RD, Marin, CA

Built 1928 Load: 29.8 t ADT: 4,000

CHILENO VALLEY RD

Good

Over: CHILENO CREEK TRIBUTARY

4.89 MI S TMALS-PTALMA RD, Marin, CA

Built 1927 Load: 29.8 t ADT: 213

U.S. HIGHWAY 101

Good

Over: NWP RR / SMART

04-MRN-101-13.25-SRF, Marin, CA

Built 1957 Load: 32.4 t ADT: 167,000

STATE ROUTE 1

Good

Over: WALKER CREEK

04-MRN-001-44.45, Marin, CA

Built 1982 Load: 32.4 t ADT: 5,900

STATE ROUTE 1

Good

Over: STEMPLE CREEK

04-MRN-001-47.41, Marin, CA

Built 1982 Load: 32.4 t ADT: 5,900

STATE ROUTE 1

Good

Over: FALLON CREEK

04-MRN-001-47.60, Marin, CA

Built 2001 Load: 32.4 t ADT: 5,900

U.S. HIGHWAY 101

Good

Over: FRANKLIN AV & NWP RR

04-MRN-101-R20.88-NVTO, Marin, CA

Built 1974 Load: 32.4 t ADT: 61,500

ROUTE 101 SB

Good

Over: RUSH LANDING RD & NWP RR

04-MRN-101-R22.24-NVTO, Marin, CA

Built 1974 Load: 32.4 t ADT: 61,500

U.S. HIGHWAY 101

Good

Over: RUSH CREEK (S BRANCH)

04-MRN-101-R22.04-NVTO, Marin, CA

Built 1974 Load: 32.4 t ADT: 123,000

U.S. HIGHWAY 101

Good

Over: RUSH CREEK (N BRANCH)

04-MRN-101-R22.13-NVTO, Marin, CA

Built 1974 Load: 32.4 t ADT: 123,000

U.S. HIGHWAY 101

Good

Over: SAN ANTONIO CREEK

04-MRN-101-27.53, Marin, CA

Built 2019 Load: 32.4 t ADT: 96,600

STATE ROUTE 1

Good

Over: OLEMA CREEK TRIBUTARY

04-MRN-001-24.67, Marin, CA

Built 2018 Load: 32.4 t ADT: 3,650

STATE ROUTE 1

Good

Over: AMERICANO CREEK

04-MRN-001-50.44, Marin, CA

Built 2018 Load: 32.4 t ADT: 1,200

STATE ROUTE 1

Good

Over: GIACOMINI GULCH

04-MRN-001-22.78, Marin, CA

Built 2018 Load: 32.4 t ADT: 3,650

101N OFFRAMP 2 ST

Good

Over: SAN RAFAEL CREEK

04-MRN-101-10.79-SRF, Marin, CA

Built 2022 Load: 32.4 t ADT: 22,800

TOMALES PETALUMA R

Good

Over: KEYES CREEK

0.1 MI EAST OF SR 1, Marin, CA

Built 1977 Load: 32.4 t ADT: 1,200

IGNACIO BLVD

Good

Over: NCRRA\NWP RR

EAST OF US 101, Marin, CA

Built 1984 Load: 32.4 t ADT: 25,546

MEADWOOD DR

Good

Over: BRANCH CORTE MADERA CRK

IN LARKSPUR, Marin, CA

Built 1974 Load: 32.4 t ADT: 3,000

CALETA AVE

Good

Over: SLEEPY HOLLOW CREEK

200 FT E BUTTERFIELD RD, Marin, CA

Built 1989 Load: 32.4 t ADT: 500

MUIR WOODS RD

Good

Over: REDWOOD CREEK

0.7 MI N OF SR 1, Marin, CA

Built 1958 Load: 32.4 t ADT: 2,187

SLAUGHTER HOUSE RD

Good

Over: ESTERO AMERICANO

JUST SOUTH OF SR 1, Marin, CA

Built 1990 Load: 32.4 t ADT: 125

SOUTH NOVATO BLVD

Good

Over: WARNER CREEK

0.2 MI S DIABLO AVE, Marin, CA

Built 1992 Load: 32.4 t ADT: 19,460

LAGUNITAS ROAD

Good

Over: CORTE MADERA CREEK

JUST W/O SIR FRANCIS DRAK, Marin, CA

Built 2011 Load: 32.4 t ADT: 3,500

NORTH HAMILTON PKW

Good

Over: PACHECO CREEK

AT ABERDEEN RD, Marin, CA

Built 2001 Load: 32.4 t ADT: 5,000

CENTER ROAD

Good

Over: VINEYARD CREEK

AT WILMAC CT, Marin, CA

Built 2008 Load: 32.4 t ADT: 5,000

SOUTHERN HEIGHTS B

Good

Over: HILLSIDE

JCT MEYER ROAD, Marin, CA

Built 2021 Load: 32.4 t ADT: 100

PT RYES PETLUMA RD

Good

Over: NICASIO CREEK

3.47 MI E STATE HWY 1, Marin, CA

Built 1960 Load: 33.0 t ADT: 10,000

2ND ST

Good

Over: IRWIN CREEK

WEST SIDE RTE 101, Marin, CA

Built 1965 Load: 34.0 t ADT: 20,000

LUCAS VALLEY ROAD

Good

Over: MILLER CREEK

1.7 MI W OF SR 101, Marin, CA

Built 1961 Load: 35.3 t ADT: 1,000

STATE ROUTE 1

Good

Over: OLEMA CREEK

04-MRN-001-22.96, Marin, CA

Built 1928 Load: 35.6 t ADT: 2,500

INTERSTATE 580

Good

Over: SAN QUENTIN STREET

04-MRN-580-2.63-SRF, Marin, CA

Built 1957 Load: 35.6 t ADT: 67,000

DE LONG AVENUE

Good

Over: NCRRA (OLD NWP RR)

04-MRN-101-R21.15-NVTO, Marin, CA

Built 1974 Load: 39.5 t ADT: 30,155

U.S. HIGHWAY 101

Good

Over: GGT, BELLAM, ANDERSEN

04-MRN-101-9.63-SRF, Marin, CA

Built 1958 Load: 40.5 t ADT: 172,000

ATHERTON AVENUE

Good

Over: NCRRA (OLD NWP RR)

04-MRN-101-R22.04-NVTO, Marin, CA

Built 1974 Load: 41.8 t ADT: 8,800

SIMMONS AVE

Good

Over: NOVATO CREEK

0.2 MI NE NOVATO BL, Marin, CA

Built 1932 Load: 42.1 t ADT: 7,037

MRSHAL-PETALUMA RD

Good

Over: SALMON CREEK

6 MI EAST OF SR 1, Marin, CA

Built 1931 Load: 42.4 t ADT: 400

MEADOW WAY

Good

Over: SAN GERONIMO CREEK

0.5 MI S SIR FRNCS DRAKE, Marin, CA

Built 1965 Load: 42.4 t ADT: 100

LAS GALLINAS AVE

Good

Over: MILLER CREEK

0.3 MI INTX LUCAS VLY RD, Marin, CA

Built 1970 Load: 45.7 t ADT: 3,830

DIABLO AVE

Good

Over: NOVATO CREEK

AT NOVATO BLVD, Marin, CA

Built 1966 Load: 48.6 t ADT: 25,882

THORSSON COURT

Good

Over: NOVATO CREEK

0.1 MI S OF NOVATO BLVD, Marin, CA

Built 2000 Load: 54.4 t ADT: 50

TAMALPAIS AVE

Good

Over: WARNER CREEK

0.1 MI SW NOVATO BLVD, Marin, CA

Built 1973 Load: 64.8 t ADT: 4,458

LAGUNITAS RD

Good

Over: SAN GERONIMO CREEK

.03 MI S SR FRNCS DRAKE B, Marin, CA

Built 1964 Load: 67.4 t ADT: 200

MEADOW WAY

Poor

Over: SAN ANSELMO CREEK

0.1 MI SE OF CASCADE DR, Marin, CA

Built 1950 Load: 13.3 t ADT: 55

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.