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Bridge conditions in San Joaquin County, California

655 inventoried bridges · 63 rated poor · 2025 National Bridge Inventory

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

San Joaquin County tracks close to typical: 63 of its 655 inventoried bridges (9.6%) are rated poor, against a national rate of about 7%.

63 of the 655 bridges in San Joaquin County, California, are rated in poor condition (9.6%) in the 2025 National Bridge Inventory, as of August 20, 2026.
220 bridges (33.6%) are rated good and 372 (56.8%) fair.
The median San Joaquin County bridge was built in 1970.
The busiest poor-rated bridge is Interstate 5 NB over Brookside Calaveras Riv (built 1968), carrying about 124,000 vehicles a day.

Good 33.6% · Fair 56.8% · Poor 9.6% of 655 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
Interstate 5 NB over Brookside Calaveras Riv	1968	124,000	Poor
Interstate 5 SB over Weber Pershing Fremont	1972	113,000	Poor
Interstate 5 over Monte Diablo Ave	1970	113,000	Poor
Interstate 5 NB over Paradise Cut Uc	1971	80,000	Poor
Interstate 5 NB over Weber Pershing Fremont	1972	56,500	Poor
Interstate 5 NB over Mosher Slough	1975	48,000	Poor
Interstate 5 SB over Walker Slough	1971	43,750	Poor
West Lane over Calaveras River	1966	41,000	Poor
West Lane over Calaveras River	1966	41,000	Poor
W4-n&s5 Connector over Lincoln UP RR BNSF Ry	1972	40,200	Poor
SR 120 WB over Guthmiller Road	1980	37,500	Poor
SR 120 WB over Mckinley Ave	1995	37,500	Poor
SR 120 EB over Mckinley Ave	1980	37,500	Poor
SR 4 WB over Lincoln UP RR BNSF Ry	1972	37,000	Poor
E205-n5 Connector over Interstate 5	1970	32,500	Poor
El Dorado St over Bianchi Road	1962	31,000	Poor
State Route 99 NB over Mokelumne Ri Frontage R	1930	29,500	Poor
E120-n99 N99-w120 over State Route 99	1980	26,000	Poor
Thornton Road over Bear Creek	1960	23,500	Poor
W120-n5 Connector over UP RR	1980	19,750	Poor
Lower Sacto Rd over Mosher Slough	1972	19,600	Poor
Interstate 580 EB over Corral Hollow Creek	1966	16,000	Poor
Interstate 580 WB over Corral Hollow Creek	1966	16,000	Poor
West Lane over Bear Creek	1966	14,064	Poor
Waterloo Rd over Stockton Diverting Canal	1967	13,366	Poor
Interstate 580 EB over UP RR & Ace	1967	13,300	Poor
Interstate 580 WB over UP RR & Ace	1967	13,300	Poor
Interstate 580 EB over UP RR & Ace	1967	13,300	Poor
Interstate 580 WB over UP RR & Ace	1967	13,300	Poor
State Route 4 WB over Spbr & Garfield Ave	1972	13,250	Poor
State Route 4 EB over Spbr & Garfield Ave	1972	13,250	Poor
Interstate 5 SB over California Aqueduct	1966	11,400	Poor
Interstate 5 SB over Delta-mendota Canal	1971	11,400	Poor
Interstate 5 NB over Delta-mendota Canal	1971	11,400	Poor
Don Ave over Mosher Slough	1976	10,641	Poor
State Route 4 over Old River	1915	8,200	Poor
S. Tracy Boulevard over Old River	1956	7,008	Poor
Center St over Stockton Channel	1949	7,000	Poor
Cherokee Rd over Stockton Diverting Canal	1948	6,863	Poor
Airport Way over Duck Creek	1968	5,300	Poor
Manthey Road over Walker Slough	1971	4,600	Poor
Airport Way over Mormon Slough	1957	4,500	Poor
Mountain House Rd over California Aqueduct	1967	4,403	Poor
Mckinley Road over North Little Johns Creek	1972	4,300	Poor
Bird Road over California Aqueduct	1966	3,491	Poor
Escalon Bellota Rd over Mormon Slough	1966	2,430	Poor
Diamond Street over Mormon Slough	1960	2,164	Poor
Turnpike Rd over Walker Slough	1971	2,100	Poor
Walnut Grove Road over Mokelumne River	1955	2,084	Poor
Acampo Road over State Route 99	1957	1,600	Poor
Howard Road over San Joaquin River 01	1975	1,482	Poor
Mackville Road over Mokelumne River	1976	1,202	Poor
Dustin Rd over Dry Creek	1974	846	Poor
Manthey Road over San Joaquin River	1926	750	Poor
Corral Hollow Rd over California Aqueduct	1967	550	Poor
Frontage Road over State Route 99	1964	500	Poor
Bird Road over Delta-mendota Canal	1950	471	Poor
Pezzi Rd over Calaveras River	1926	402	Poor
Sexton Rd over Ssjid Canal	1941	210	Poor
Blewett Road over California Aqueduct	1967	200	Poor
Buckman Rd over Duck Creek	1931	179	Poor
Undine Road over Middle River	1975	152	Poor
UP RR BNSF Amtrak over Martin Luther King Jr Bl	1937	30	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Interstate 5 SB over Paradise Cut	1947	143,000	Fair
Interstate 5 NB over Brookside Calaveras Riv	1968	124,000	Poor
Interstate 5 NB over Country Club Blvd	1970	124,000	Fair
Interstate 5 NB over Michigan Ave	1970	124,000	Fair
Interstate 5 NB over Alpine Ave	1970	124,000	Fair
Interstate 5 NB over Telegraph Ave	1970	124,000	Fair
Interstate 5 NB over W March Lane	1970	124,000	Fair
Interstate 5 NB over Ebmud Aqueduct	1970	124,000	Fair
Interstate 5 SB over Weber Pershing Fremont	1972	113,000	Poor
Interstate 5 over Monte Diablo Ave	1970	113,000	Poor

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

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