Siskiyou County, CA

423 public highway bridges

Siskiyou County Bridge Snapshot

Siskiyou County, California contains 423 public highway bridges in the FHWA National Bridge Inventory. Roughly 36.2% are rated “Good,” 49.6% “Fair,” 5.4% “Poor,” and 5.4% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

423
Total Bridges
36.2%
Good
5.4%
Poor
5.4%
Structurally Deficient

Condition Distribution

Good
36.2% (153)
Fair
49.6% (210)
Poor
5.4% (23)
SD
5.4% (23)

All Bridges (423)

NO DATA ENTERED

Fair

Over: BOULDER CREEK

CALLAHAN, Siskiyou, CA

Built 1967 ADT: 2

NO DATA ENTERED

Fair

Over: S FK SCOTT RIVER

CALLAHAN, Siskiyou, CA

Built 1995 ADT: 3

NO DATA ENTERED

Fair

Over: MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 2000 ADT: 30

MILL CREEK ROAD

Fair

Over: MILL CREEK

SCOTT BAR, Siskiyou, CA

Built 1993 ADT: 50

NO DATA ENTERED

Fair

Over: KANGAROO CREEK

CALLAHAN, Siskiyou, CA

Built 2006 ADT: 50

NO DATA ENTERED

Fair

Over: TRAIL GULCH

CALLAHAN, Siskiyou, CA

Built 2005 ADT: 50

MARTIN DAIRY ROAD

Fair

Over: LITTLE SHASTA RIVER

GOOSENEST, Siskiyou, CA

Built 1970 ADT: 50

BLUE CANYON ROAD

Fair

Over: BUTTE CREEK

GOOSENEST, Siskiyou, CA

Built 1969 ADT: 50

ANTELOPE CK ROAD

Fair

Over: BUTTE CREEK

GOOSENEST, Siskiyou, CA

Built 1974 ADT: 50

NO DATA ENTERED

Fair

Over: ANTELOPE CREEK

GOOSENEST, Siskiyou, CA

Built 1969 ADT: 10

NO DATA ENTERED

Fair

Over: BUTTE CREEK

GOOSENEST, Siskiyou, CA

Built 1965 ADT: 10

TOAD LAKE

Fair

Over: MID. FK. SCRAMENTO RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1966 ADT: 50

STOUTS MEADOW

Fair

Over: MCCLOUD RIVER

ALGOMA CAMPGROUND, Siskiyou, CA

Built 1940 ADT: 50

COW CREEK

Fair

Over: MCCLOUD RIVER

NO DATA ENTERED, Siskiyou, CA

Built 1969 ADT: 50

HORN LANE

Fair

Over: SCOTT RIVER

1.0 MI EAST OF SR 3, Siskiyou, CA

Built 1956 Load: 6.5 t ADT: 194

GRAYBACK ROAD

Fair

Over: INDIAN CREEK

INDIAN, Siskiyou, CA

Built 1965 Load: 6.8 t ADT: 50

WILDCAT CREEK ROAD

Fair

Over: SCOTT RIVER

0.1 MI E OF SR 3, Siskiyou, CA

Built 1909 Load: 9.7 t ADT: 20

CANYON CREEK ROAD

Fair

Over: SCOTT RIVER

SCOTT BAR, Siskiyou, CA

Built 1958 Load: 11.3 t ADT: 50

LOUIE ROAD

Fair

Over: SHASTA RIVER

4.0 MI N/E OF I-5, Siskiyou, CA

Built 1935 Load: 11.7 t ADT: 45

STATE ROUTE 96

Fair

Over: DILLON CREEK

02-SIS-096-R16.13, Siskiyou, CA

Built 1966 Load: 12.0 t ADT: 330

RAILROAD PARK ROAD

Fair

Over: LITTLE CASTLE CREEK

0.1 MI W OF I-5, Siskiyou, CA

Built 1960 Load: 13.0 t ADT: 126

ELLER LANE

Fair

Over: SCOTT RIVER

JUST EAST OF ISLAND RD, Siskiyou, CA

Built 1910 Load: 13.3 t ADT: 172

SACRAMENTO AVE

Fair

Over: SACRAMENTO RIVER

AT RIVER AVE, Siskiyou, CA

Built 1965 Load: 14.6 t ADT: 175

BAILEY HILL RD

Fair

Over: HUTTON CREEK

0.75 MI S/O RTE 5, Siskiyou, CA

Built 1915 Load: 15.6 t ADT: 25

SHOVEL CREEK ROAD

Fair

Over: SHOVEL CREEK

GOOSENEST, Siskiyou, CA

Built 1968 Load: 15.9 t ADT: 50

FAIRLANE RD

Fair

Over: JUNIPER CREEK

0.3 MI S OF WALTERS LN, Siskiyou, CA

Built 1923 Load: 16.2 t ADT: 171

OLD HIGHWAY 99

Fair

Over: HAY CREEK

0.1 MI S TRUITMAN LANE, Siskiyou, CA

Built 1923 Load: 16.2 t ADT: 1,005

BUTTERFLY AVE

Fair

Over: SACRAMENTO RIVER

W OF RIO BLANCO RD, Siskiyou, CA

Built 1915 Load: 17.2 t ADT: 320

PETERSBURG ROAD

Fair

Over: CECIL CREEK

.3 MI S/O CECILVILLE ROAD, Siskiyou, CA

Built 1967 Load: 17.2 t ADT: 29

CECILVILLE RD

Fair

Over: SHADOW CREEK

2 MI N/O EDDY GULCH ROAD, Siskiyou, CA

Built 1960 Load: 17.2 t ADT: 49

S FORK ROAD

Fair

Over: INDIAN CREEK

AT INDIAN CRK RD, Siskiyou, CA

Built 1965 Load: 17.2 t ADT: 58

EAST CALLAHAN ROAD

Fair

Over: EAST FORK SCOTT RIVER

0.2 M NE/O SR 3, Siskiyou, CA

Built 1956 Load: 17.5 t ADT: 213

CRAG VIEW DR

Fair

Over: LITTLE CASTLE CREEK

0.1 MI E I-5, Siskiyou, CA

Built 1917 Load: 17.8 t ADT: 20

PEACH ORCHARD ROAD

Fair

Over: MOFFETT CREEK

0.2 MI E SR 3, Siskiyou, CA

Built 1920 Load: 18.1 t ADT: 94

AGER BESWICK RD

Fair

Over: SHOVEL CREEK

3.4 MI E OF COPCO ROAD, Siskiyou, CA

Built 1977 Load: 18.1 t ADT: 37

YREKA WALKER RD

Fair

Over: HUMBUG CREEK

JUST S OF HUMBUG CREEK RD, Siskiyou, CA

Built 1957 Load: 18.1 t ADT: 56

FRENCH CREEK RD

Fair

Over: DUCK LAKE CREEK

6.2 MI S/O SR 3, Siskiyou, CA

Built 1987 Load: 18.1 t ADT: 100

FRENCH CREEK ROAD

Fair

Over: NORTH FORK FRENCH CREEK

2.9 MI S OF SR 3, Siskiyou, CA

Built 1975 Load: 18.5 t ADT: 245

BRIDGE STREET

Fair

Over: SACRAMENTO RIVER

WEST OF FIRST ST, Siskiyou, CA

Built 1965 Load: 19.4 t ADT: 1,104

BIG SPRINGS ROAD

Fair

Over: LITTLE SHASTA RIVER

.5 MI S LWR LTL SHASTA RD, Siskiyou, CA

Built 1959 Load: 20.1 t ADT: 45

COLD BOTTLE SPRING

Fair

Over: LITTLE SHASTA RIVER

GOOSENEST, Siskiyou, CA

Built 1970 Load: 20.1 t ADT: 20

QUARTZ VALLEY ROAD

Fair

Over: SCOTT RIVER

0.3 MI S SCOTT RIVER RD, Siskiyou, CA

Built 1967 Load: 20.4 t ADT: 329

HORSE CREEK ROAD

Fair

Over: SEIAD CREEK

HORSE, Siskiyou, CA

Built 1956 Load: 20.4 t ADT: 50

COPCO RD

Fair

Over: DRY CREEK

3.4 MI E OF AGER RD, Siskiyou, CA

Built 1960 Load: 21.1 t ADT: 226

CECILVILLE ROAD

Fair

Over: SOUTH FORK SCOTT RIVER

0.05 MI WEST OF S R 3, Siskiyou, CA

Built 1954 Load: 21.4 t ADT: 490

CANYON CREEK RD

Fair

Over: SCOTT RIVER

0.1 MI S/O SCOTT RIV RD, Siskiyou, CA

Built 1938 Load: 22.0 t ADT: 6

BOULDER CREEK RD

Fair

Over: CANYON CREEK

0.1 MI SW SCOTT RIVER RD, Siskiyou, CA

Built 1993 Load: 22.0 t ADT: 8

SUGAR CREEK ROAD

Fair

Over: MINERS CREEK

0.2 MI S MINER CREEK RD, Siskiyou, CA

Built 1976 Load: 22.0 t ADT: 41

SALMON RIVER ROAD

Fair

Over: SALMON RIVER

3.4 MI W/O SAWYERS BAR RD, Siskiyou, CA

Built 1966 Load: 22.7 t ADT: 72

FAY LANE

Fair

Over: SCOTT RIVER

0.5 MI E/O SR 3, Siskiyou, CA

Built 1975 Load: 22.7 t ADT: 136

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial