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Every bridge in Sierra County, California

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

66 inventoried bridges, busiest first

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

Sierra County, California, has 66 bridges in the 2025 National Bridge Inventory: 29 rated good, 33 fair, and 4 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 395 over Long Valley Rd	1976	4,600	Good
U.S. Highway 395 over Long Valley Rd	1976	2,300	Good
State Route 89 over Little Truckee River	1982	2,000	Fair
State Route 49 over Smithneck Creek	1965	1,900	Good
State Route 89 over Turner Canyon	1975	1,400	Good
State Route 49 over Downie River	1938	1,200	Good
State Route 49 over Goodyears Creek	1972	1,200	Good
State Route 89 over Fletcher Creek	1969	1,020	Fair
Railroad Avenue over East Branch Smithneck CR	1987	1,000	Poor
State Route 49 over Sierraville Creek	1962	1,000	Good
SR 49 over Buried Drain Pipe	2017	850	Good
State Route 49 over N Yuba River N Side Chnl	2021	850	Good
State Route 49 over Sidehill Viaduct	2024	850	Good
Gold Lake Road over Howard Creek	2008	830	Fair
State Route 49 over Howard Creek	1964	800	Fair
State Route 49 over Salmon Creek	1964	800	Good
State Route 49 over N Yuba River N Side Chnl	2021	680	Good
State Route 49 over N Yuba River N Side Chnl	2021	680	Good
State Route 49 over N Yuba River N Side Chnl	2021	680	Good
Westside Rd over Middle Branch Carman Crk	1950	670	Fair
Westside Rd over North Branch Carman Crk	1950	670	Poor
Westside Rd over South Branch Carman Crk	1950	670	Poor
State Route 49 over Fiddle Creek	1958	600	Fair
State Route 49 over Hillside	1976	600	Good
State Route 49 over Hillside	1976	600	Good
State Route 49 over Hillside	1980	600	Fair
State Route 49 over Hillside	1981	600	Good
State Route 49 over Hillside	1986	600	Good
State Route 49 over Hillside	1988	600	Good
State Route 49 over Ladies Canyon Creek	1932	600	Fair
State Route 49 over North Yuba River	1964	600	Fair
Nevada Street over North Fork Yuba River	1938	500	Fair
Old Fibreboard Rd over Little Truckee River	2014	400	Good
Henness Pass Road over Little Truckee River	2002	340	Good
Packer Lake Road over Salmon Creek	1960	200	Poor
Wild Plum Road over North Fork Yuba River	1963	200	Fair
Brandy City Road over Fiddle Creek	1959	150	Fair
Main St CR S500 over Downie River	1986	150	Fair
Sierra Butte Road over Reis Ravine	2005	150	Good
Salmon Lake Road over Church Creek	2023	125	Good
Mountain House Rd over Woodruff Creek	1970	110	Fair
Mountain House Rd over North Fork Yuba River	1936	100	Fair
Mountain House Rd over South Fork Oregon Creek	1966	100	Good
Pearl Street over Downie River	1934	100	Good
Mountain House Rd over North Fork Oregon Creek	1966	75	Fair
Mountian House Rd over Woodruff/rock Creek	1950	75	Fair
C 843 over Middle Fk. Yuba River	1965	50	Fair
Crow City Road over North Fork Yuba River	1963	50	Fair
Fdr 39 over Cherokee Creek	1940	50	Fair
Fdr 524-01 over N. Yuba River	1963	50	Fair
Fdr 524-1-2 over Haypress Creek	1938	50	Fair
Goodyears Creek Rd over Goodyears Creek	2007	50	Fair
Jim Crow Road over San Juan Creek	1960	50	Fair
Lavezzola Road over Lavezzola Creek	1958	50	Fair
No Data Entered over N. Yuba River	1978	50	Good
Post Office Spur over Goodyears Creek	1954	50	Fair
Road 20n06 over Rock Creek	1983	50	Good
Road 21n02 over Sulphur Creek	1964	50	Good
Road 7-30 over Little Truckee River	1998	50	Good
Lemon Canyon Road over Lemon Creek	1965	25	Fair
Port Wine Ridge Rd over Cedar Grove Ravine	1975	25	Fair
Port Wine Ridge Rd over Rock Creek	1961	25	Fair
Port Wine Ridge Rd over Rock Creek	1961	25	Fair
Port Wine Ridge Rd over Rock Creek Tributary	1970	25	Fair
Brandy City Road over Cherokee Creek	1940	20	Fair
Plumbago Road over Kanaka Creek	1985	20	Fair

Source: FHWA National Bridge Inventory, 2025.

Sierra County bridge conditions · California bridges by county.

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