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)

ENTERPRISE CONCRSE

Fair

Over: COYOTE CREEK TRIBUTARY

.02 MI W TENNESSEE VLY RD, Marin, CA

Built 1950 Load: 13.0 t ADT: 70

STATE PARK ROAD

Fair

Over: LAGUNITAS CREEK

SAMUEL P TAYLOR STATE PK, Marin, CA

Built 1947 Load: 13.3 t ADT: 50

SIR-FRANCIS DRAKE

Fair

Over: CORTE MADERA CR(DRAKE)

3.5 MI W SR 101 SN ANSLM, Marin, CA

Built 1929 Load: 14.9 t ADT: 34,000

WINSHIP ROAD

Fair

Over: CORTE MADERA CREEK

0.03 MI E/O SIR FRAN DRK, Marin, CA

Built 1909 Load: 14.9 t ADT: 2,000

SAN ANTONIO RD

Fair

Over: SOUTH SAN ANTONIO CREEK

0.6 MI N OF US 101, Marin, CA

Built 1917 Load: 15.2 t ADT: 200

BARBER AVE

Fair

Over: CORTE MADERA CREEK

0.1 MI E OF FRANCIS DRAKE, Marin, CA

Built 1930 Load: 15.2 t ADT: 1,500

CENTER BLVD

Fair

Over: SAN ANSELMO CREEK

AT SYCAMORE AVE, Marin, CA

Built 1940 Load: 15.2 t ADT: 14,000

BRIDGE AVE

Fair

Over: SAN ANSELMO CREEK

80M SW OF SIR FRANCIS DRK, Marin, CA

Built 1935 Load: 15.2 t ADT: 9,000

ALEXANDER AVE

Fair

Over: ABANDONED NWP RR ROW

0.1 MI E OF MAGNOLIA AVE, Marin, CA

Built 1925 Load: 15.2 t ADT: 1,570

NICASSIO VLY RD

Fair

Over: HALLECK CREEK

1 MI N LUCAS VLY RD, Marin, CA

Built 1931 Load: 15.6 t ADT: 2,000

CREEK ROAD

Fair

Over: SAN ANSELMO CREEK

AT DOMINGA AVE, Marin, CA

Built 1929 Load: 15.6 t ADT: 255

MAIN GATE ROAD

Fair

Over: SMART RAILROAD

0.37 MI E HWY 101, Marin, CA

Built 1930 Load: 15.6 t ADT: 5,000

STATE ROUTE 1

Fair

Over: LAGUNITAS CREEK OVERFLOW

04-MRN-001-28.39, Marin, CA

Built 1929 Load: 16.2 t ADT: 3,000

STATE ROUTE 1

Fair

Over: LAGUNITAS CREEK OVERFLOW

04-MRN-001-28.56, Marin, CA

Built 1929 Load: 16.2 t ADT: 3,000

STATE ROUTE 1

Fair

Over: ELLIS CREEK

04-MRN-001-34.97, Marin, CA

Built 1931 Load: 16.2 t ADT: 2,300

STATE ROUTE 1

Fair

Over: TOMASINI CANYON

04-MRN-001-29.85, Marin, CA

Built 1925 Load: 16.2 t ADT: 2,300

SUTRO AVE

Fair

Over: NOVATO CREEK

0.1 MI S NOVATO BLVD, Marin, CA

Built 1935 Load: 16.2 t ADT: 7,153

WILSON HILL RD

Fair

Over: ARROYO SAUSAL TRIBUTARY

0.22 MI W PT RYS-PETLMA R, Marin, CA

Built 1928 Load: 16.2 t ADT: 330

MONTEZUMA RD

Fair

Over: SAN GERONIMO CREEK

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

Built 1938 Load: 16.2 t ADT: 50

MARIN DR

Fair

Over: FAIRFAX CREEK

AT BOTHIN RD, Marin, CA

Built 1930 Load: 16.2 t ADT: 110

U.S. HIGHWAY 101

Fair

Over: GOLDEN GATE-SAN FRAN BAY

04-MRN-101-L0.01, Marin, CA

Built 1937 Load: 16.5 t ADT: 112,000

MADRONE AVE

Fair

Over: SAN ANSELMO CREEK

150 FT E OF NOKOMIS, Marin, CA

Built 1930 Load: 16.5 t ADT: 1,500

SUMMIT AVE

Fair

Over: HILLSIDE

1.4 MI INTRX LOVELL AVE, Marin, CA

Built 1980 Load: 16.8 t ADT: 257

GLENWOOD AVE

Fair

Over: ROSS CREEK

JUST N/O LAGUNITAS RD, Marin, CA

Built 1909 Load: 16.8 t ADT: 2,370

SPRUCE RD

Fair

Over: FAIRFAX CREEK

50 FT W OF ARROYO RD, Marin, CA

Built 1930 Load: 16.8 t ADT: 255

LOCUST AVE

Fair

Over: AYO CORTE MADERA DEL PRE

250 FT N OF MILLER AVE, Marin, CA

Built 1934 Load: 17.3 t ADT: 4,500

ALEXANDER AVENUE

Fair

Over: EAST ROAD

1.3 KM EAST OF SR 101, Marin, CA

Built 1938 Load: 17.8 t ADT: 7,201

PT REYES PETLMA RD

Fair

Over: NICASIO CREEK

3.2 MI E OF SR 1, Marin, CA

Built 1937 Load: 18.5 t ADT: 6,000

SIR-FRANCIS DRAKE

Fair

Over: DEVILS GULCH

4.4 MI E OF SR 1, Marin, CA

Built 1920 Load: 19.4 t ADT: 3,000

MOUNT LASSEN DR SB

Fair

Over: MILLER CREEK

0.06 MI N LUCAS VALLEY RD, Marin, CA

Built 1925 Load: 21.1 t ADT: 980

MUIR WOODS RD

Fair

Over: REDWOOD CREEK

2.0 MI N OF SR 1, Marin, CA

Built 1946 Load: 22.4 t ADT: 2,090

SIR-FRANCIS DRAKE

Fair

Over: LAGUNITAS CREEK

5.9 MI E OF SH 1, Marin, CA

Built 1929 Load: 23.0 t ADT: 2,000

SIR-FRANCIS DRAKE

Fair

Over: LAGUNITAS CREEK

SHAFTER BRIDGE, Marin, CA

Built 1982 Load: 23.3 t ADT: 3,000

NICASSIO VLY RD

Fair

Over: NICASIO DRAIN NO 2

S PT. REYES - PETALM, Marin, CA

Built 1968 Load: 24.3 t ADT: 1,750

BEL MARIN KEYS BL

Fair

Over: ARROYO SAN JOSE

JUST N COMMERCIAL DR, Marin, CA

Built 1970 Load: 24.3 t ADT: 20,883

BEL MARIN KEYS BL

Fair

Over: NOVATO CREEK DRAIN

1 MI NW NAVE DR, Marin, CA

Built 1960 Load: 24.3 t ADT: 6,838

IGNACIO BLVD

Fair

Over: ARROYO SAN JOSE

0.4 MI W US 101, Marin, CA

Built 1960 Load: 24.3 t ADT: 11,820

REDWOOD BLVD

Fair

Over: DUTTON SLOUGH

0.1 MI SE ROWLAND BL, Marin, CA

Built 1968 Load: 24.3 t ADT: 3,641

MOUNTAIN VIEW AVE

Fair

Over: SAN GEROMINO CREEK

INT SIR FRANCIS DRAKE BL, Marin, CA

Built 1962 Load: 24.3 t ADT: 100

POINT SAN RAFAEL R

Fair

Over: SAN RAFAEL BAY INLET

BY INTERSECT OF KNIGHT DR, Marin, CA

Built 1955 Load: 24.3 t ADT: 2,400

U.S. HIGHWAY 101

Fair

Over: HILLSIDE

04-MRN-101-1.19-SAUS, Marin, CA

Built 1954 Load: 24.5 t ADT: 53,000

U.S. HIGHWAY 101

Fair

Over: MILLER CREEK

04-MRN-101-15.35, Marin, CA

Built 1952 Load: 24.6 t ADT: 151,000

FLAMINGO RD

Fair

Over: COYOTE CREEK

0.17 MI N MARINE AVE, Marin, CA

Built 1964 Load: 25.3 t ADT: 1,705

STINSON BEACH ROAD

Fair

Over: EASKOOT CREEK

West from US Route 101 on, Marin, CA

Built 1959 Load: 26.3 t ADT: 150

GRAND AVE

Fair

Over: SAN RAFAEL CREEK

500 FT E OF US HWY 101, Marin, CA

Built 1965 Load: 27.5 t ADT: 19,800

STATE ROUTE 1

Fair

Over: ESKOOT CREEK

04-MRN-001-12.37, Marin, CA

Built 1957 Load: 30.1 t ADT: 4,100

U.S. HIGHWAY 101

Fair

Over: ARROYO DE SAN JOSE

04-MRN-101-18.15, Marin, CA

Built 1928 Load: 30.8 t ADT: 139,000

BUNKER ROAD

Fair

Over: RODEO LAGOON

From US Route 101 take Sa, Marin, CA

Built 1983 Load: 30.8 t ADT: 600

MT MCKINLEY RD

Fair

Over: MILLER CREEK

LUCAS VLY RD INTERSECTION, Marin, CA

Built 1963 Load: 31.1 t ADT: 800

U.S. HIGHWAY 101

Fair

Over: N BRANCH GALLINAS CREEK

04-MRN-101-13.99-SRF, Marin, CA

Built 1951 Load: 32.4 t ADT: 159,000

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

Related

Browse all → | Rankings →
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.