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Bridge conditions in Siskiyou County, California

425 inventoried bridges · 25 rated poor · 2025 National Bridge Inventory

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

The federal inventory lists 425 bridges in Siskiyou County: 170 rated good, 230 fair, and 25 poor.

25 of the 425 bridges in Siskiyou County, California, are rated in poor condition (5.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
170 bridges (40.0%) are rated good and 230 (54.1%) fair.
The median Siskiyou County bridge was built in 1969.
The busiest poor-rated bridge is Interstate 5 over Panorama Road (built 1960), carrying about 18,000 vehicles a day.

Good 40.0% · Fair 54.1% · Poor 5.9% of 425 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 over Panorama Road	1960	18,000	Poor
State Route 96 over Thompson Creek	1952	615	Poor
State Route 96 over Scott River	1957	600	Poor
N Old Stage Rd over Shasta River	1968	379	Poor
Lake View Road over Klamath River	1960	226	Poor
Salmon River Road over Salmon River	1966	210	Poor
Hospital Road over Yreka Creek	1987	200	Poor
Eller Lane over Scott River	1910	172	Poor
West Beaver Road over West Fork Beaver Creek	1983	50	Poor
Trapper Road over Trapper Creek	1978	50	Poor
South Russian Road over Russian Creek	1966	50	Poor
China Mt. Road over Houston Creek	1974	50	Poor
Boulder Road over East Boulder Creek	1966	50	Poor
Camp Eden Road over Duck Lake Creek	1949	50	Poor
Tom Walker Road over Tompkins Creek	1988	50	Poor
No Data Entered over West Boulder Creek	2004	50	Poor
No Data Entered over Elk Creek	1971	30	Poor
Horse Creek Rd over Klamath River	1930	21	Poor
Wildcat Creek Road over Scott River	1909	20	Poor
Independence Road over Independence Creek	1970	20	Poor
Methodist Ck Road over S. Fk. Salmon River	1963	20	Poor
Old Cottonwood CR over Cottonwood Creek	1957	10	Poor
Road over Mid Fk Applegate	1963	10	Poor
Road over Butte Fork Creek	1951	10	Poor
No Data Entered over Boulder Creek	1967	2	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Interstate 5 SB over UP RR & Amtrak	1964	20,000	Fair
Interstate 5 NB over UP RR & Amtrak	1964	20,000	Fair
Interstate 5 over Mott Road	1976	20,000	Good
Interstate 5 over Mott Road	1976	20,000	Fair
Interstate 5 over Dunsmuir Ave	1976	19,200	Good
Interstate 5 over Sacramento UP RR Amtrak	1955	18,000	Good
Interstate 5 over Little Castle Creek	1960	18,000	Fair
Interstate 5 over Dunsmuir Ave	1960	18,000	Good
Interstate 5 over Panorama Road	1960	18,000	Poor
Interstate 5 over Oak Street	1960	18,000	Good

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

Every bridge in Siskiyou County → - all 425, busiest first, each with its own condition record.

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.