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Every bridge in Marin County, California

Name: Every bridge in Marin County, California
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

207 inventoried bridges, busiest first

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Marin County, California, has 207 bridges in the 2025 National Bridge Inventory: 91 rated good, 100 fair, and 16 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
U.S. Highway 101 over Lincoln Ave-n101 on Ramp	1938	180,000	Fair
US Highway 101 over North San Pedro Road	1979	180,000	Fair
U.S. Highway 101 over Linden Lane	1947	173,000	Good
U.S. Highway 101 over Corte Madera CR & Sfd Bl	1957	172,000	Fair
U.S. Highway 101 over Ggt Bellam Andersen	1958	172,000	Good
U.S. Highway 101 over Wornum Drive	1929	172,000	Good
U.S. Highway 101 over Nwp RR / Smart	1957	167,000	Good
U.S. Highway 101 over N Branch Gallinas Creek	1951	159,000	Fair
U.S. Highway 101 over Lucas Valley Road	1952	151,000	Good
U.S. Highway 101 over Miller Creek	1952	151,000	Fair
U.S. Highway 101 over Arroyo De San Jose	1928	139,000	Fair
U.S. Highway 101 over SR 1 Rich By Frntge Rd	1957	133,000	Good
U.S. Highway 101 over Irwin Creek	1895	129,000	Good
U.S. Highway 101 over Rush Creek (N Branch)	1974	123,000	Good
U.S. Highway 101 over Rush Creek (S Branch)	1974	123,000	Good
U.S. Highway 101 over Donahue St/n. Bridge Bld	1943	106,000	Good
U.S. Highway 101 over Sausalito Road	1935	106,000	Good
U.S. Highway 101 over US 101 on & Off Ramps	1954	106,000	Good
U.S. Highway 101 over San Antonio Creek	2019	96,600	Good
U.S. Highway 101 over Golden Gate-san Fran Bay	1937	90,932	Fair
Interstate 580 over San Quentin Street	1957	67,000	Good
State Route 580 over Bellam Boulevard	1959	67,000	Fair
State Route 580 over Bellam Boulevard	2010	67,000	Good
U. S. Highway 101 over 2ND 3RD 4TH 5TH Mssn	1941	64,500	Fair
U.S. Highway 101 over 2ND 3RD 4TH 5TH Mssn	1965	64,500	Fair
Route 101 NB over Rush Landing Rd & Nwp RR	1974	61,500	Good
Route 101 SB over Rush Landing Rd & Nwp RR	1974	61,500	Good
U.S. Highway 101 over Franklin Av & Nwp RR	1974	61,500	Fair
U.S. Highway 101 over Franklin Av & Nwp RR	1974	61,500	Good
U.S. Highway 101 over Novato Creek	1974	61,500	Poor
U.S. Hwy 101 NB over Olive Avenue	1974	61,500	Fair
U.S. Hwy 101 SB over Olive Avenue	1974	61,500	Fair
U.S. Highway 101 over Hillside	1954	53,000	Good
U.S. Highway 101 over Hillside	1954	53,000	Fair
Sir Fran Drake Blv over State Route 580	1957	51,000	Good
Tamalpais Drive over US Highway 101	1957	40,000	Fair
State Route 37 over Atherton Avenue	1959	35,500	Fair
State Route 37 over Atherton Avenue	1959	35,500	Fair
Sir-francis Drake over San Anselmo Creek	1929	34,000	Fair
State Route 37 over Petaluma River	1958	34,000	Fair
State Route 37 over Simonds Slough	1959	34,000	Good
Sir Francis Drake over Corte Madera Creek	1926	32,300	Good
State Route 1 over Coyote Creek	1954	30,500	Fair
De Long Avenue over U.S. Highway 101	1974	30,160	Fair
De Long Avenue over Ncrra (old Nwp RR)	1974	30,155	Good
State Route 131 over US Highway 101	1956	27,250	Good
U.S. Highway 101 over Corte Madera CR & Sfd Bl	1961	26,000	Fair
Diablo Ave over Novato Creek	1966	25,882	Fair
Sir Francis Drake over Lagunitas Creek	1964	25,582	Poor
Ignacio Blvd over Ncrra\nwp RR	1984	25,546	Good
101N Offramp 2 St over San Rafael Creek	2022	22,800	Good
Sb101-e580 Connect over US Highway 101	2009	22,200	Good
Bel Marin Keys Bl over Arroyo San Jose	1970	20,883	Fair
2ND St over Irwin Creek	1965	20,000	Good
3RD St over Irwin Creek	1968	20,000	Good
Grand Ave over San Rafael Creek	1965	19,800	Fair
U.S. Highway 101 over Corte Madera CR & EB Sfd	1959	19,700	Poor
South Novato Blvd over Warner Creek	1992	19,460	Good
Freitas Pkwy over U.S. Highway 101	1960	18,000	Poor
W37-s101&n101 Off over County Rd US 101 Nwprr	1964	18,000	Fair
State Route 37 EB over Novato Creek	1959	17,000	Fair
State Route 37 WB over Novato Creek	1959	17,000	Fair
Redwood Hwy over Gallinas Creek	1969	16,000	Good
S101-e37 & Novato- over U.S. Highway 101	1964	15,000	Good
N&s101-e37 Connctr over S Novato Bl N101 & Nwprr	1964	14,500	Good
Center Blvd over San Anselmo Creek	1940	14,000	Fair
Ignacio Boulevard over U.S. Highway 101	1964	12,900	Poor
S Novato Blvd over W37-s101 Connector Ramp	1964	12,500	Fair
Center Blvd over San Anselmo Creek	1935	12,000	Fair
Ignacio Blvd over Arroyo San Jose	1960	11,820	Fair
Lincoln Ave over San Rafael Creek	1959	11,601	Poor
Novato Blvd over Novato Creek	1969	10,024	Poor
Pt Ryes Petluma Rd over Nicasio Creek	1960	10,000	Good
Miller Creek Road over U.S. Highway 101	1961	9,280	Fair
Merrydale Road over US 101 & Merrydale Rd	1996	9,170	Fair
Redwood Blvd over Novato Creek	1947	9,103	Good
Redwood Blvd over Novato Creek	1929	9,103	Fair
Bridge Ave over San Anselmo Creek	1935	9,000	Fair
Atherton Avenue over Ncrra (old Nwp RR)	1974	8,800	Good
Atherton Avenue over U.S. Highway 101	1974	8,760	Fair
Freitas Prky over Gallinas Creek	1950	8,738	Good
Seventh St over Novato Creek	1971	7,729	Fair
Diablo Blvd over Warner Creek	1970	7,723	Good
Clay St / Nave Dr over U.S. Highway 101	1964	7,310	Fair
Alexander Ave over Bunker Road	1937	7,201	Fair
Alexander Avenue over East Road	1937	7,201	Fair
Sutro Ave over Novato Creek	1935	7,153	Fair
Simmons Ave over Novato Creek	1932	7,037	Good
Las Galinas Av over Gallinas Creek	1965	6,871	Good
Bel Marin Keys Bl over Novato Creek Drain	1960	6,838	Fair
Grant Ave over Novato Creek	1936	6,711	Good
Lucas Valley Rd over Miller Creek	1959	6,500	Good
Doherty Dr over Arroyo Holon	2014	6,381	Fair
College Ave over Corte Madera Creek	1970	6,000	Good
Pt Reyes Petlma Rd over Nicasio Creek	1937	6,000	Fair
Rowland Boulevard over U.S. Highway 101	1974	6,000	Fair
State Route 1 over Fallon Creek	2001	5,900	Good
Lindaro St over Mahon Creek	1962	5,735	Good
Center Road over Vineyard Creek	2008	5,000	Good
Main Gate Road over Smart Railroad	1930	5,000	Fair
North Hamilton Pkw over Pacheco Creek	2001	5,000	Good
Locust Ave over Ayo Corte Madera Del Pre	1934	4,500	Fair
Tamalpais Ave over Warner Creek	1973	4,458	Good
State Route 1 over Eskoot Creek	1957	4,100	Good
State Route 1 over Hillside	1982	4,100	Good
State Route 1 over Hillside	1982	4,100	Good
Camino Alto over Ayo Corte Madera Del Pre	1970	4,000	Good
Nicasio Val Rd over Arroyo Nicasio	1928	4,000	Good
Las Gallinas Ave over Miller Creek	1970	3,830	Good
State Route 1 over Redwood Creek	1926	3,800	Poor
W37-n101 Connector over Novato Bl-n101 Nwp RR	1964	3,800	Fair
State Route 1 over Giacomini Gulch	2018	3,650	Good
State Route 1 over Olema Creek Tributary	2018	3,650	Good
Redwood Blvd over Dutton Slough	1968	3,641	Fair
Kerner Blvd over Indst Prk Drainage Canal	1972	3,600	Poor
Andersen Drive over Mahon Creek	1997	3,500	Fair
Bear Valley Rd over Olema Creek	1937	3,500	Poor
Lagunitas Road over Corte Madera Creek	2011	3,500	Good
Sir Francis Drake over Whites Hill Trail	2002	3,500	Fair
Sir-francis Drake over San Geronimo Creek	1929	3,500	Fair
State Route 1 over Lagunitas Creek	1929	3,500	Poor
State Route 1 over Lagunitas Creek Overflow	1929	3,500	Fair
State Route 1 over Lagunitas Creek Overflow	1929	3,500	Good
N101-san Pedro Rd over North San Pedro Road	1970	3,300	Good
Novato Blvd over Bowman Canyon	1948	3,056	Poor
La Goma St over Ayo Corte Madera Del Pre	1950	3,000	Good
Lucky Drive over Branch Corte Madera Crk	1970	3,000	Good
Meadwood Dr over Branch Corte Madera Crk	1974	3,000	Good
Saunders Ave over San Anselmo Creek	1935	3,000	Fair
Sir Francis Drake over Olema Creek	1930	3,000	Good
Sir-francis Drake over Devils Gulch	1920	3,000	Fair
Sir-francis Drake over Lagunitas Creek	1982	3,000	Fair
State Route 1 over Olema Creek	1928	2,900	Fair
Rowland Way over Novato Creek	1992	2,735	Good
Pt Reyes Petlma Rd over Arroyo Sausal	1933	2,590	Good
Wolfback Ridge Rd over U.S. Highway 101	1954	2,512	Good
State Route 1 over Olema Creek	1928	2,500	Good
Point San Rafael R over San Rafael Bay Inlet	1955	2,400	Fair
Glenwood Ave over Ross Creek	1909	2,370	Fair
State Route 1 over Ellis Creek	1931	2,300	Fair
State Route 1 over Millerton Gulch	1997	2,300	Fair
State Route 1 over Tomasini Canyon	1925	2,300	Fair
Muir Woods Rd over Redwood Creek	1958	2,187	Good
Muir Woods Rd over Redwood Creek	1946	2,090	Fair
Olema-bolinas Rd over Pine Gulch Creek	1986	2,076	Fair
Beach Rd (main St) over San Francisco Bay	1918	2,000	Poor
Nicassio Vly Rd over Halleck Creek	1931	2,000	Fair
Sir-francis Drake over Lagunitas Creek	1929	2,000	Fair
Winship Road over Corte Madera Creek	1909	2,000	Fair
Shady Lane over Ross Creek	1909	1,800	Good
Nicasio Vly Rd over Nicasio Drain #1	1968	1,750	Good
Nicassio Vly Rd over Nicasio Drain No 2	1968	1,750	Fair
Flamingo Rd over Coyote Creek	1964	1,705	Fair
Alexander Ave over Abandoned Nwp RR Row	1925	1,570	Fair
Barber Ave over Corte Madera Creek	1930	1,500	Fair
Madrone Ave over San Anselmo Creek	1930	1,500	Fair
Pt Reyes Petlma Rd over San Antonio Creek	1964	1,450	Fair
State Route 1 over Walker Creek	1982	1,400	Good
Norwood Ave over Ross Creek	1908	1,200	Good
State Route 1 over Americano Creek	2018	1,200	Good
Tomales Petaluma R over Keyes Creek	1977	1,200	Good
State Route 1 over Stemple Creek	1982	1,100	Fair
Lucas Valley Road over Miller Creek	1961	1,000	Good
S101 on & Off Ramp over U.S. Highway 101	2006	1,000	Good
Mount Lassen Dr NB over Miller Creek	1965	980	Fair
Mount Lassen Dr SB over Miller Creek	1925	980	Fair
Mt Mckinley Rd over Miller Creek	1963	800	Fair
Bunker Road over Rodeo Lagoon	1983	600	Fair
Bridgegate Dr over Miller Creek	1987	500	Fair
Caleta Ave over Sleepy Hollow Creek	1989	500	Good
Mount Shasta Dr over Miller Creek	1962	500	Fair
W Castlewood Drive over San Rafael Bay Inlet	1965	500	Good
Mrshal-petaluma Rd over Salmon Creek	1931	400	Good
Nokomis Ave over San Anselmo Creek	1930	400	Fair
Wilson Hill Rd over Arroyo Sausal Tributary	1928	330	Good
Marshall Petlum Rd over Salmon Creek	1931	328	Poor
Marshall-petaluma over Salmon Creek	1928	328	Fair
Mrshal Petaluma Rd over San Antonio Creek	1929	328	Good
Summit Ave over Hillside	1980	257	Fair
Creek Road over San Anselmo Creek	1929	255	Fair
Spruce Rd over Fairfax Creek	1930	255	Fair
Fallon-two Rock Rd over Estero De San Antonio	1932	249	Good
Chileno Valley Rd over Chileno Creek Tributary	1927	213	Good
Lagunitas Rd over San Geronimo Creek	1964	200	Good
San Antonio Rd over South San Antonio Creek	1917	200	Fair
Stinson Beach Road over Easkoot Creek	1959	150	Fair
Slaughter House Rd over Estero Americano	1990	125	Good
Azalea Ave over Fairfax Creek	1930	110	Poor
Marin Dr over Fairfax Creek	1930	110	Fair
Canyon Road over San Anselmo Creek	1998	100	Fair
Meadow Way over San Geronimo Creek	1965	100	Good
Mountain View Ave over San Geromino Creek	1962	100	Fair
Southern Heights B over Hillside	2021	100	Good
Vly Fd Frnklin Sch over Estero De San Antonio	1964	100	Fair
Vly-frd-frkln Sch over Estero Americano	1961	100	Fair
Twin Bridge Rd over Stemple Creek	1958	80	Good
Pacific Way over Redwood Creek	1956	75	Good
Enterprise Concrse over Coyote Creek Tributary	1950	70	Fair
Alexander Rd over Stemple Creek	1962	60	Good
Meadow Way over San Anselmo Creek	1950	55	Poor
Montezuma Rd over San Geronimo Creek	1938	50	Fair
State Park Road over Lagunitas Creek	1947	50	Fair
Thorsson Court over Novato Creek	2000	50	Good
W San Francisco Bl over San Rafael Creek	1981	50	Fair
Middle Rd over Estero De San Antonio	1958	40	Fair
Horse Creek Camp R over Olema Creek	1960	20	Fair
Mill Crossing over Lagunitas Creek	1947	1	Fair

Source: FHWA National Bridge Inventory, 2025.

Marin County bridge conditions · California bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.