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)

STATE ROUTE 96

Fair

Over: TI CREEK

02-SIS-096-R11.99, Siskiyou, CA

Built 1967 Load: 23.3 t ADT: 330

STATE ROUTE 3

Fair

Over: SHASTA RIVER

02-SIS-003-51.76, Siskiyou, CA

Built 1959 Load: 23.3 t ADT: 2,900

STATE ROUTE 96

Fair

Over: CLEAR CREEK

02-SIS-096-32.60, Siskiyou, CA

Built 1966 Load: 23.3 t ADT: 400

SCARLETT WAY

Fair

Over: SACRAMENTO RIVER

0.2 MI NW DUNSMUIR AVE, Siskiyou, CA

Built 1970 Load: 23.3 t ADT: 59

ROAD

Fair

Over: JOE CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1954 Load: 23.6 t ADT: 10

DUNSMUIR AVENUE

Fair

Over: SACRAMENTO,UP RR,AMTRAK

02-SIS-005-2.65-DMR, Siskiyou, CA

Built 1966 Load: 24.3 t ADT: 5,000

STATE ROUTE 263

Fair

Over: SHASTA RIVER

02-SIS-263-55.03, Siskiyou, CA

Built 1931 Load: 24.3 t ADT: 1,200

STATE ROUTE 96

Fair

Over: STANSHAW CREEK

02-SIS-096-R8.20, Siskiyou, CA

Built 1942 Load: 24.3 t ADT: 330

STATE ROUTE 96

Fair

Over: LUMGREY CREEK

02-SIS-096-93.07, Siskiyou, CA

Built 1923 Load: 24.3 t ADT: 650

STATE ROUTE 96

Fair

Over: EMPIRE CREEK

02-SIS-096-93.09, Siskiyou, CA

Built 1923 Load: 24.3 t ADT: 800

COPCO RD

Fair

Over: FALL CREEK

0.3 MI W FALL CREEK RD, Siskiyou, CA

Built 1969 Load: 24.3 t ADT: 42

CRAM GULCH RD

Fair

Over: SCHULMEYER GULCH

OLD HWY 99, Siskiyou, CA

Built 1972 Load: 24.3 t ADT: 391

WEST ST

Fair

Over: HUMBUG GULCH

0.05 MI S/O MINER ST, Siskiyou, CA

Built 1965 Load: 24.3 t ADT: 165

CHINA GRADE ROAD

Fair

Over: CHINA CREEK

1.9 MI N. EAST HORSE CR., Siskiyou, CA

Built 1956 Load: 24.3 t ADT: 50

ROAD

Fair

Over: MID FK APPLEGATE

NO DATA ENTERED, Siskiyou, CA

Built 1951 Load: 24.5 t ADT: 50

AGER ROAD

Fair

Over: OREGON SLOUGH

0.45 MI S RESERVOIR RD, Siskiyou, CA

Built 1980 Load: 24.6 t ADT: 841

CARIBOU RD

Fair

Over: SOUTH FORK SALMON RIVER

4 MI S CECILVILLE RD, Siskiyou, CA

Built 1965 Load: 24.6 t ADT: 100

NO DATA ENTERED

Fair

Over: ELK CREEK

ELK-THOMPSON, Siskiyou, CA

Built 1971 Load: 24.9 t ADT: 30

SALMON RIVER RD

Fair

Over: BUTLER CREEK

9.9 MI N/O SAWYERS BAR RD, Siskiyou, CA

Built 1938 Load: 25.3 t ADT: 101

ROAD

Fair

Over: ELLIOTT CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1953 Load: 25.4 t ADT: 12

ROAD

Fair

Over: ELLIOTT CREEK

NO DATA ENTERED, Siskiyou, CA

Built 1954 Load: 25.4 t ADT: 10

ELLER LANE

Fair

Over: PATTERSON CREEK

0.2 MI W ISLAND RD, Siskiyou, CA

Built 1971 Load: 25.6 t ADT: 71

STATE ROUTE 3

Fair

Over: PATTERSON CREEK

02-SIS-003-24.26, Siskiyou, CA

Built 1962 Load: 25.9 t ADT: 2,825

STATE ROUTE 96

Fair

Over: INDIAN CREEK

02-SIS-096-41.02, Siskiyou, CA

Built 1962 Load: 25.9 t ADT: 1,000

SAWYERS BAR RD

Fair

Over: JACKASS GULCH

1.7 MI W EDDYS GULCH RD, Siskiyou, CA

Built 1968 Load: 25.9 t ADT: 323

FAIRLANE ROAD

Fair

Over: YREKA CREEK

0.3 MI S/O SHARPS RD, Siskiyou, CA

Built 1970 Load: 26.9 t ADT: 1,081

HILT HUNGRY ROAD

Fair

Over: COTTONWOOD CREEK

1.4 MI SOUTH OF HILT RD, Siskiyou, CA

Built 1933 Load: 27.2 t ADT: 23

SANDY BAR ROAD

Fair

Over: TI CREEK

UKONOM, Siskiyou, CA

Built 1965 Load: 27.2 t ADT: 50

SHACKLEFORD CK RD

Fair

Over: BIG MEADOWS CREEK

SCOTT BAR, Siskiyou, CA

Built 1982 Load: 27.9 t ADT: 50

STATE ROUTE 263

Fair

Over: SHASTA RIVER

02-SIS-263-56.35, Siskiyou, CA

Built 1931 Load: 28.2 t ADT: 1,200

MULLOY ROAD

Fair

Over: WILLOW CREEK

0.5 MI SOUTH OF YORK RD, Siskiyou, CA

Built 1982 Load: 28.2 t ADT: 41

SCOTT RIVER RD

Fair

Over: MIDDLE CREEK

1.4 MI N KELSEY CREEK RD, Siskiyou, CA

Built 1900 Load: 28.5 t ADT: 135

STATE ROUTE 263

Fair

Over: DRY GULCH

02-SIS-263-54.51, Siskiyou, CA

Built 1929 Load: 28.8 t ADT: 1,200

INTERSTATE 5 SB

Fair

Over: SHASTA RIVER

02-SIS-005-R51.16, Siskiyou, CA

Built 1970 Load: 28.8 t ADT: 7,050

STATE ROUTE 96

Fair

Over: OAK FLAT CREEK

02-SIS-096-34.35, Siskiyou, CA

Built 1952 Load: 29.2 t ADT: 400

INTERSTATE 5 NB

Fair

Over: SHASTA RIVER

02-SIS-005-R51.16, Siskiyou, CA

Built 1970 Load: 29.2 t ADT: 7,050

CECILVILLE ROAD

Fair

Over: BLACK BEAR CREEK

10.1 MI N/W CECILVILLE, Siskiyou, CA

Built 1940 Load: 29.2 t ADT: 101

INTERSTATE 5

Fair

Over: MOONLIT OAKS AVE

02-SIS-005-R45.62-YRE, Siskiyou, CA

Built 1970 Load: 29.5 t ADT: 8,300

INTERSTATE 5

Fair

Over: MOONLIT OAKS AVE

02-SIS-005-R45.62-YRE, Siskiyou, CA

Built 1970 Load: 29.5 t ADT: 8,300

INTERSTATE 5

Fair

Over: DEETZ ROAD

02-SIS-005-R15.32, Siskiyou, CA

Built 1973 Load: 29.5 t ADT: 12,300

INTERSTATE 5 SB

Fair

Over: TRUITMAN LANE

02-SIS-005-R36.02, Siskiyou, CA

Built 1969 Load: 29.8 t ADT: 7,550

INTERSTATE 5 NB

Fair

Over: TRUITMAN LANE

02-SIS-005-R36.02, Siskiyou, CA

Built 1969 Load: 29.8 t ADT: 7,550

INTERSTATE 5 NB

Fair

Over: SOUTH WEED BLVD

02-SIS-005-R17.44, Siskiyou, CA

Built 1973 Load: 30.1 t ADT: 7,150

INTERSTATE 5 SB

Fair

Over: SOUTH WEED BLVD

02-SIS-005-R17.44, Siskiyou, CA

Built 1973 Load: 30.5 t ADT: 7,150

INTERSTATE 5

Fair

Over: MOTT ROAD

02-SIS-005-5.90, Siskiyou, CA

Built 1976 Load: 30.5 t ADT: 20,000

CECILVILLE ROAD

Fair

Over: INDIAN CREEK

10.7 MI N/O EDDY GULCH RD, Siskiyou, CA

Built 1940 Load: 30.5 t ADT: 100

INTERSTATE 5 SB

Fair

Over: UP RR & AMTRAK

02-SIS-005-R9.20, Siskiyou, CA

Built 1964 Load: 30.8 t ADT: 20,000

EDDYS GULCH ROAD

Fair

Over: NORTH FORK SALMON RIVER

S SAWYERS BAR RD, Siskiyou, CA

Built 1968 Load: 30.8 t ADT: 167

E LENNOX ST

Fair

Over: YREKA CREEK

0.1 MI E/O SR 3, Siskiyou, CA

Built 1953 Load: 31.8 t ADT: 4

INTERSTATE 5

Fair

Over: GREENHORN CREEK

02-SIS-005-R46.05-YRE, Siskiyou, CA

Built 1970 Load: 32.4 t ADT: 16,600

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

Related

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