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Bridge conditions in Kern County, California

668 inventoried bridges · 37 rated poor · 2025 National Bridge Inventory

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

37 of the 668 bridges the federal inventory lists in Kern County are rated poor; the rest split 332 good and 299 fair.

37 of the 668 bridges in Kern County, California, are rated in poor condition (5.5%) in the 2025 National Bridge Inventory, as of August 20, 2026.
332 bridges (49.7%) are rated good and 299 (44.8%) fair.
The median Kern County bridge was built in 1969.
The busiest poor-rated bridge is State Route 99 over High St & UP RR (built 1955), carrying about 53,000 vehicles a day.

Good 49.7% · Fair 44.8% · Poor 5.5% of 668 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
State Route 99 over High St & UP RR	1955	53,000	Poor
Panama Lane over State Route 99	1962	44,034	Poor
Wible Road over State Route 99	1962	40,000	Poor
Wilson Road over State Route 99	1962	40,000	Poor
Gosford Rd NB over Kern River Canal	1981	18,900	Poor
Gosford Rd SB over Arvin-edison Canal	1984	17,700	Poor
Interstate 5 SB over Millux Road & Sunset RR	1967	17,000	Poor
Interstate 5 NB over Millux Road & Sunset RR	1967	17,000	Poor
Interstate 5 SB over State Route 58 & Tvrr	1969	17,000	Poor
Interstate 5 NB over State Route 58 & Tvrr	1969	17,000	Poor
Interstate 5 SB over Kern River Flood Canal	1967	16,000	Poor
Interstate 5 NB over Kern River Flood Canal	1967	16,000	Poor
Interstate 5 SB over Kern River	1969	15,000	Poor
Interstate 5 NB over Kern River	1969	15,000	Poor
Beale Ave over UP RR Sumner St Kentucky	1960	14,615	Poor
Panorama Drive over Manor Street	1957	12,000	Poor
S65-s99 Connector over State Route 99	1964	8,800	Poor
N 10TH Street over Sandy Creek	1979	7,590	Poor
State Route 46 over Goose Lake Canal	1956	6,100	Poor
Stockdale Highway over Interstate 5	1969	5,000	Poor
State Route 223 over State Route 99	1962	4,700	Poor
Knudsen Drive over UP RR & Golden State Hwy	1948	4,000	Poor
Perkins Ave over UP RR	1963	3,970	Poor
Lost Hills Road over California Aqueduct	1966	3,561	Poor
Houghton Road over State Route 99	1962	3,515	Poor
Sherwood Ave over UP RR	1963	3,060	Poor
Lerdo Highway over Interstate 5	1967	3,000	Poor
Lerdo Highway over California Aqueduct	1966	2,492	Poor
Randsburg Cutoff over Los Angeles Aqueduct	1966	2,260	Poor
State Route 166 over California Aqueduct	1968	2,100	Poor
Elk Hills Road over California Aqueduct	1968	1,253	Poor
Bakersfld-glen Rd over Granite Canyon Creek	1948	930	Poor
Whisler Road over State Route 99	1970	900	Poor
Twisselman Road over California Aqueduct	1965	800	Poor
Tejon Highway over Bear Valley Creek	1983	710	Poor
Gun Club Road over Poso Creek	1966	680	Poor
Wildwood Road over Poso Creek	1966	640	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
State Route 99 over Kern River	1961	140,000	Fair
State Route 99 over BNSF Ry & Amtrak	1961	132,000	Good
State Route 99 over California Avenue	1963	132,000	Good
State Route 99 over SR 178 (rosedale Hwy)	1963	132,000	Good
State Route 99 over Truxtun Ave	1963	132,000	Good
State Route 99 over Canal Lateral 29	1933	130,000	Good
State Route 99 over Gilmore Ave	1963	114,000	Good
State Route 99 over Calloway Canal	1963	100,000	Good
State Route 99 NB over Lerdo Canal	1936	90,000	Fair
State Route 99 over Lerdo Canal	1913	90,000	Fair

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

All of California: California bridge conditions by county · every download on the data page.

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